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valid.c

/*
 * valid.c : part of the code use to do the DTD handling and the validity
 *           checking
 *
 * See Copyright for the status of this software.
 *
 * daniel@veillard.com
 */

#define IN_LIBXML
#include "libxml.h"

#include <string.h>

#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif

#include <libxml/xmlmemory.h>
#include <libxml/hash.h>
#include <libxml/uri.h>
#include <libxml/valid.h>
#include <libxml/parser.h>
#include <libxml/parserInternals.h>
#include <libxml/xmlerror.h>
#include <libxml/list.h>
#include <libxml/globals.h>

static xmlElementPtr xmlGetDtdElementDesc2(xmlDtdPtr dtd, const xmlChar *name,
                                 int create);
/* #define DEBUG_VALID_ALGO */
/* #define DEBUG_REGEXP_ALGO */

#define TODO                                                \
    xmlGenericError(xmlGenericErrorContext,                       \
          "Unimplemented block at %s:%d\n",                       \
            __FILE__, __LINE__);

/************************************************************************
 *                                                    *
 *                Error handling routines                   *
 *                                                    *
 ************************************************************************/

/**
 * xmlVErrMemory:
 * @ctxt:  an XML validation parser context
 * @extra:  extra informations
 *
 * Handle an out of memory error
 */
static void
xmlVErrMemory(xmlValidCtxtPtr ctxt, const char *extra)
{
    xmlGenericErrorFunc channel = NULL;
    xmlParserCtxtPtr pctxt = NULL;
    void *data = NULL;

    if (ctxt != NULL) {
        channel = ctxt->error;
        data = ctxt->userData;
      /* Use the special values to detect if it is part of a parsing
         context */
      if ((ctxt->finishDtd == XML_CTXT_FINISH_DTD_0) ||
          (ctxt->finishDtd == XML_CTXT_FINISH_DTD_1)) {
          long delta = (char *) ctxt - (char *) ctxt->userData;
          if ((delta > 0) && (delta < 250))
            pctxt = ctxt->userData;
      }
    }
    if (extra)
        __xmlRaiseError(NULL, channel, data,
                        pctxt, NULL, XML_FROM_VALID, XML_ERR_NO_MEMORY,
                        XML_ERR_FATAL, NULL, 0, extra, NULL, NULL, 0, 0,
                        "Memory allocation failed : %s\n", extra);
    else
        __xmlRaiseError(NULL, channel, data,
                        pctxt, NULL, XML_FROM_VALID, XML_ERR_NO_MEMORY,
                        XML_ERR_FATAL, NULL, 0, NULL, NULL, NULL, 0, 0,
                        "Memory allocation failed\n");
}

/**
 * xmlErrValid:
 * @ctxt:  an XML validation parser context
 * @error:  the error number
 * @extra:  extra informations
 *
 * Handle a validation error
 */
static void
xmlErrValid(xmlValidCtxtPtr ctxt, xmlParserErrors error,
            const char *msg, const char *extra)
{
    xmlGenericErrorFunc channel = NULL;
    xmlParserCtxtPtr pctxt = NULL;
    void *data = NULL;

    if (ctxt != NULL) {
        channel = ctxt->error;
        data = ctxt->userData;
      /* Use the special values to detect if it is part of a parsing
         context */
      if ((ctxt->finishDtd == XML_CTXT_FINISH_DTD_0) ||
          (ctxt->finishDtd == XML_CTXT_FINISH_DTD_1)) {
          long delta = (char *) ctxt - (char *) ctxt->userData;
          if ((delta > 0) && (delta < 250))
            pctxt = ctxt->userData;
      }
    }
    if (extra)
        __xmlRaiseError(NULL, channel, data,
                        pctxt, NULL, XML_FROM_VALID, error,
                        XML_ERR_ERROR, NULL, 0, extra, NULL, NULL, 0, 0,
                        msg, extra);
    else
        __xmlRaiseError(NULL, channel, data,
                        pctxt, NULL, XML_FROM_VALID, error,
                        XML_ERR_ERROR, NULL, 0, NULL, NULL, NULL, 0, 0,
                        msg);
}

#if defined(LIBXML_VALID_ENABLED) || defined(LIBXML_SCHEMAS_ENABLED)
/**
 * xmlErrValidNode:
 * @ctxt:  an XML validation parser context
 * @node:  the node raising the error
 * @error:  the error number
 * @str1:  extra informations
 * @str2:  extra informations
 * @str3:  extra informations
 *
 * Handle a validation error, provide contextual informations
 */
static void
xmlErrValidNode(xmlValidCtxtPtr ctxt,
                xmlNodePtr node, xmlParserErrors error,
                const char *msg, const xmlChar * str1,
                const xmlChar * str2, const xmlChar * str3)
{
    xmlStructuredErrorFunc schannel = NULL;
    xmlGenericErrorFunc channel = NULL;
    xmlParserCtxtPtr pctxt = NULL;
    void *data = NULL;

    if (ctxt != NULL) {
        channel = ctxt->error;
        data = ctxt->userData;
      /* Use the special values to detect if it is part of a parsing
         context */
      if ((ctxt->finishDtd == XML_CTXT_FINISH_DTD_0) ||
          (ctxt->finishDtd == XML_CTXT_FINISH_DTD_1)) {
          long delta = (char *) ctxt - (char *) ctxt->userData;
          if ((delta > 0) && (delta < 250))
            pctxt = ctxt->userData;
      }
    }
    __xmlRaiseError(schannel, channel, data, pctxt, node, XML_FROM_VALID, error,
                    XML_ERR_ERROR, NULL, 0,
                    (const char *) str1,
                    (const char *) str1,
                    (const char *) str3, 0, 0, msg, str1, str2, str3);
}
#endif /* LIBXML_VALID_ENABLED or LIBXML_SCHEMAS_ENABLED */

#ifdef LIBXML_VALID_ENABLED
/**
 * xmlErrValidNodeNr:
 * @ctxt:  an XML validation parser context
 * @node:  the node raising the error
 * @error:  the error number
 * @str1:  extra informations
 * @int2:  extra informations
 * @str3:  extra informations
 *
 * Handle a validation error, provide contextual informations
 */
static void
xmlErrValidNodeNr(xmlValidCtxtPtr ctxt,
                xmlNodePtr node, xmlParserErrors error,
                const char *msg, const xmlChar * str1,
                int int2, const xmlChar * str3)
{
    xmlStructuredErrorFunc schannel = NULL;
    xmlGenericErrorFunc channel = NULL;
    xmlParserCtxtPtr pctxt = NULL;
    void *data = NULL;

    if (ctxt != NULL) {
        channel = ctxt->error;
        data = ctxt->userData;
      /* Use the special values to detect if it is part of a parsing
         context */
      if ((ctxt->finishDtd == XML_CTXT_FINISH_DTD_0) ||
          (ctxt->finishDtd == XML_CTXT_FINISH_DTD_1)) {
          long delta = (char *) ctxt - (char *) ctxt->userData;
          if ((delta > 0) && (delta < 250))
            pctxt = ctxt->userData;
      }
    }
    __xmlRaiseError(schannel, channel, data, pctxt, node, XML_FROM_VALID, error,
                    XML_ERR_ERROR, NULL, 0,
                    (const char *) str1,
                    (const char *) str3,
                    NULL, int2, 0, msg, str1, int2, str3);
}

/**
 * xmlErrValidWarning:
 * @ctxt:  an XML validation parser context
 * @node:  the node raising the error
 * @error:  the error number
 * @str1:  extra information
 * @str2:  extra information
 * @str3:  extra information
 *
 * Handle a validation error, provide contextual information
 */
static void
xmlErrValidWarning(xmlValidCtxtPtr ctxt,
                xmlNodePtr node, xmlParserErrors error,
                const char *msg, const xmlChar * str1,
                const xmlChar * str2, const xmlChar * str3)
{
    xmlStructuredErrorFunc schannel = NULL;
    xmlGenericErrorFunc channel = NULL;
    xmlParserCtxtPtr pctxt = NULL;
    void *data = NULL;

    if (ctxt != NULL) {
        channel = ctxt->warning;
        data = ctxt->userData;
      /* Use the special values to detect if it is part of a parsing
         context */
      if ((ctxt->finishDtd == XML_CTXT_FINISH_DTD_0) ||
          (ctxt->finishDtd == XML_CTXT_FINISH_DTD_1)) {
          long delta = (char *) ctxt - (char *) ctxt->userData;
          if ((delta > 0) && (delta < 250))
            pctxt = ctxt->userData;
      }
    }
    __xmlRaiseError(schannel, channel, data, pctxt, node, XML_FROM_VALID, error,
                    XML_ERR_WARNING, NULL, 0,
                    (const char *) str1,
                    (const char *) str1,
                    (const char *) str3, 0, 0, msg, str1, str2, str3);
}



#ifdef LIBXML_REGEXP_ENABLED
/*
 * If regexp are enabled we can do continuous validation without the
 * need of a tree to validate the content model. this is done in each
 * callbacks.
 * Each xmlValidState represent the validation state associated to the
 * set of nodes currently open from the document root to the current element.
 */


typedef struct _xmlValidState {
    xmlElementPtr  elemDecl;  /* pointer to the content model */
    xmlNodePtr           node;            /* pointer to the current node */
    xmlRegExecCtxtPtr    exec;            /* regexp runtime */
} _xmlValidState;


static int
vstateVPush(xmlValidCtxtPtr ctxt, xmlElementPtr elemDecl, xmlNodePtr node) {
    if ((ctxt->vstateMax == 0) || (ctxt->vstateTab == NULL)) {
      ctxt->vstateMax = 10;
      ctxt->vstateTab = (xmlValidState *) xmlMalloc(ctxt->vstateMax *
                          sizeof(ctxt->vstateTab[0]));
        if (ctxt->vstateTab == NULL) {
          xmlVErrMemory(ctxt, "malloc failed");
          return(-1);
      }
    }

    if (ctxt->vstateNr >= ctxt->vstateMax) {
        xmlValidState *tmp;

      tmp = (xmlValidState *) xmlRealloc(ctxt->vstateTab,
                   2 * ctxt->vstateMax * sizeof(ctxt->vstateTab[0]));
        if (tmp == NULL) {
          xmlVErrMemory(ctxt, "realloc failed");
          return(-1);
      }
      ctxt->vstateMax *= 2;
      ctxt->vstateTab = tmp;
    }
    ctxt->vstate = &ctxt->vstateTab[ctxt->vstateNr];
    ctxt->vstateTab[ctxt->vstateNr].elemDecl = elemDecl;
    ctxt->vstateTab[ctxt->vstateNr].node = node;
    if ((elemDecl != NULL) && (elemDecl->etype == XML_ELEMENT_TYPE_ELEMENT)) {
      if (elemDecl->contModel == NULL)
          xmlValidBuildContentModel(ctxt, elemDecl);
      if (elemDecl->contModel != NULL) {
          ctxt->vstateTab[ctxt->vstateNr].exec = 
            xmlRegNewExecCtxt(elemDecl->contModel, NULL, NULL);
      } else {
          ctxt->vstateTab[ctxt->vstateNr].exec = NULL;
          xmlErrValidNode(ctxt, (xmlNodePtr) elemDecl,
                          XML_ERR_INTERNAL_ERROR,
                      "Failed to build content model regexp for %s\n",
                      node->name, NULL, NULL);
      }
    }
    return(ctxt->vstateNr++);
}

static int
vstateVPop(xmlValidCtxtPtr ctxt) {
    xmlElementPtr elemDecl;

    if (ctxt->vstateNr < 1) return(-1);
    ctxt->vstateNr--;
    elemDecl = ctxt->vstateTab[ctxt->vstateNr].elemDecl;
    ctxt->vstateTab[ctxt->vstateNr].elemDecl = NULL;
    ctxt->vstateTab[ctxt->vstateNr].node = NULL;
    if ((elemDecl != NULL) && (elemDecl->etype == XML_ELEMENT_TYPE_ELEMENT)) {
      xmlRegFreeExecCtxt(ctxt->vstateTab[ctxt->vstateNr].exec);
    }
    ctxt->vstateTab[ctxt->vstateNr].exec = NULL;
    if (ctxt->vstateNr >= 1)
      ctxt->vstate = &ctxt->vstateTab[ctxt->vstateNr - 1];
    else
      ctxt->vstate = NULL;
    return(ctxt->vstateNr);
}

#else /* not LIBXML_REGEXP_ENABLED */
/*
 * If regexp are not enabled, it uses a home made algorithm less
 * complex and easier to
 * debug/maintain than a generic NFA -> DFA state based algo. The
 * only restriction is on the deepness of the tree limited by the
 * size of the occurs bitfield
 *
 * this is the content of a saved state for rollbacks
 */

#define ROLLBACK_OR     0
#define ROLLBACK_PARENT 1

typedef struct _xmlValidState {
    xmlElementContentPtr cont;      /* pointer to the content model subtree */
    xmlNodePtr           node;      /* pointer to the current node in the list */
    long                 occurs;/* bitfield for multiple occurrences */
    unsigned char        depth; /* current depth in the overall tree */
    unsigned char        state; /* ROLLBACK_XXX */
} _xmlValidState;

#define MAX_RECURSE 25000
#define MAX_DEPTH ((sizeof(_xmlValidState.occurs)) * 8)
#define CONT ctxt->vstate->cont
#define NODE ctxt->vstate->node
#define DEPTH ctxt->vstate->depth
#define OCCURS ctxt->vstate->occurs
#define STATE ctxt->vstate->state

#define OCCURRENCE (ctxt->vstate->occurs & (1 << DEPTH))
#define PARENT_OCCURRENCE (ctxt->vstate->occurs & ((1 << DEPTH) - 1))

#define SET_OCCURRENCE ctxt->vstate->occurs |= (1 << DEPTH)
#define RESET_OCCURRENCE ctxt->vstate->occurs &= ((1 << DEPTH) - 1)

static int
vstateVPush(xmlValidCtxtPtr ctxt, xmlElementContentPtr cont,
          xmlNodePtr node, unsigned char depth, long occurs,
          unsigned char state) {
    int i = ctxt->vstateNr - 1;

    if (ctxt->vstateNr > MAX_RECURSE) {
      return(-1);
    }
    if (ctxt->vstateTab == NULL) {
      ctxt->vstateMax = 8;
      ctxt->vstateTab = (xmlValidState *) xmlMalloc(
                 ctxt->vstateMax * sizeof(ctxt->vstateTab[0]));
      if (ctxt->vstateTab == NULL) {
          xmlVErrMemory(ctxt, "malloc failed");
          return(-1);
      }
    }
    if (ctxt->vstateNr >= ctxt->vstateMax) {
        xmlValidState *tmp;

        tmp = (xmlValidState *) xmlRealloc(ctxt->vstateTab,
                   2 * ctxt->vstateMax * sizeof(ctxt->vstateTab[0]));
        if (tmp == NULL) {
          xmlVErrMemory(ctxt, "malloc failed");
          return(-1);
      }
      ctxt->vstateMax *= 2;
      ctxt->vstateTab = tmp;
      ctxt->vstate = &ctxt->vstateTab[0];
    }
    /*
     * Don't push on the stack a state already here
     */
    if ((i >= 0) && (ctxt->vstateTab[i].cont == cont) &&
      (ctxt->vstateTab[i].node == node) &&
      (ctxt->vstateTab[i].depth == depth) &&
      (ctxt->vstateTab[i].occurs == occurs) &&
      (ctxt->vstateTab[i].state == state))
      return(ctxt->vstateNr);
    ctxt->vstateTab[ctxt->vstateNr].cont = cont;
    ctxt->vstateTab[ctxt->vstateNr].node = node;
    ctxt->vstateTab[ctxt->vstateNr].depth = depth;
    ctxt->vstateTab[ctxt->vstateNr].occurs = occurs;
    ctxt->vstateTab[ctxt->vstateNr].state = state;
    return(ctxt->vstateNr++);
}

static int
vstateVPop(xmlValidCtxtPtr ctxt) {
    if (ctxt->vstateNr <= 1) return(-1);
    ctxt->vstateNr--;
    ctxt->vstate = &ctxt->vstateTab[0];
    ctxt->vstate->cont =  ctxt->vstateTab[ctxt->vstateNr].cont;
    ctxt->vstate->node = ctxt->vstateTab[ctxt->vstateNr].node;
    ctxt->vstate->depth = ctxt->vstateTab[ctxt->vstateNr].depth;
    ctxt->vstate->occurs = ctxt->vstateTab[ctxt->vstateNr].occurs;
    ctxt->vstate->state = ctxt->vstateTab[ctxt->vstateNr].state;
    return(ctxt->vstateNr);
}

#endif /* LIBXML_REGEXP_ENABLED */

static int
nodeVPush(xmlValidCtxtPtr ctxt, xmlNodePtr value)
{
    if (ctxt->nodeMax <= 0) {
        ctxt->nodeMax = 4;
        ctxt->nodeTab =
            (xmlNodePtr *) xmlMalloc(ctxt->nodeMax *
                                     sizeof(ctxt->nodeTab[0]));
        if (ctxt->nodeTab == NULL) {
          xmlVErrMemory(ctxt, "malloc failed");
            ctxt->nodeMax = 0;
            return (0);
        }
    }
    if (ctxt->nodeNr >= ctxt->nodeMax) {
        xmlNodePtr *tmp;
        tmp = (xmlNodePtr *) xmlRealloc(ctxt->nodeTab,
                        ctxt->nodeMax * 2 * sizeof(ctxt->nodeTab[0]));
        if (tmp == NULL) {
          xmlVErrMemory(ctxt, "realloc failed");
            return (0);
        }
        ctxt->nodeMax *= 2;
      ctxt->nodeTab = tmp;
    }
    ctxt->nodeTab[ctxt->nodeNr] = value;
    ctxt->node = value;
    return (ctxt->nodeNr++);
}
static xmlNodePtr
nodeVPop(xmlValidCtxtPtr ctxt)
{
    xmlNodePtr ret;

    if (ctxt->nodeNr <= 0)
        return (NULL);
    ctxt->nodeNr--;
    if (ctxt->nodeNr > 0)
        ctxt->node = ctxt->nodeTab[ctxt->nodeNr - 1];
    else
        ctxt->node = NULL;
    ret = ctxt->nodeTab[ctxt->nodeNr];
    ctxt->nodeTab[ctxt->nodeNr] = NULL;
    return (ret);
}

#ifdef DEBUG_VALID_ALGO
static void
xmlValidPrintNode(xmlNodePtr cur) {
    if (cur == NULL) {
      xmlGenericError(xmlGenericErrorContext, "null");
      return;
    }
    switch (cur->type) {
      case XML_ELEMENT_NODE:
          xmlGenericError(xmlGenericErrorContext, "%s ", cur->name);
          break;
      case XML_TEXT_NODE:
          xmlGenericError(xmlGenericErrorContext, "text ");
          break;
      case XML_CDATA_SECTION_NODE:
          xmlGenericError(xmlGenericErrorContext, "cdata ");
          break;
      case XML_ENTITY_REF_NODE:
          xmlGenericError(xmlGenericErrorContext, "&%s; ", cur->name);
          break;
      case XML_PI_NODE:
          xmlGenericError(xmlGenericErrorContext, "pi(%s) ", cur->name);
          break;
      case XML_COMMENT_NODE:
          xmlGenericError(xmlGenericErrorContext, "comment ");
          break;
      case XML_ATTRIBUTE_NODE:
          xmlGenericError(xmlGenericErrorContext, "?attr? ");
          break;
      case XML_ENTITY_NODE:
          xmlGenericError(xmlGenericErrorContext, "?ent? ");
          break;
      case XML_DOCUMENT_NODE:
          xmlGenericError(xmlGenericErrorContext, "?doc? ");
          break;
      case XML_DOCUMENT_TYPE_NODE:
          xmlGenericError(xmlGenericErrorContext, "?doctype? ");
          break;
      case XML_DOCUMENT_FRAG_NODE:
          xmlGenericError(xmlGenericErrorContext, "?frag? ");
          break;
      case XML_NOTATION_NODE:
          xmlGenericError(xmlGenericErrorContext, "?nota? ");
          break;
      case XML_HTML_DOCUMENT_NODE:
          xmlGenericError(xmlGenericErrorContext, "?html? ");
          break;
#ifdef LIBXML_DOCB_ENABLED
      case XML_DOCB_DOCUMENT_NODE:
          xmlGenericError(xmlGenericErrorContext, "?docb? ");
          break;
#endif
      case XML_DTD_NODE:
          xmlGenericError(xmlGenericErrorContext, "?dtd? ");
          break;
      case XML_ELEMENT_DECL:
          xmlGenericError(xmlGenericErrorContext, "?edecl? ");
          break;
      case XML_ATTRIBUTE_DECL:
          xmlGenericError(xmlGenericErrorContext, "?adecl? ");
          break;
      case XML_ENTITY_DECL:
          xmlGenericError(xmlGenericErrorContext, "?entdecl? ");
          break;
      case XML_NAMESPACE_DECL:
          xmlGenericError(xmlGenericErrorContext, "?nsdecl? ");
          break;
      case XML_XINCLUDE_START:
          xmlGenericError(xmlGenericErrorContext, "incstart ");
          break;
      case XML_XINCLUDE_END:
          xmlGenericError(xmlGenericErrorContext, "incend ");
          break;
    }
}

static void
xmlValidPrintNodeList(xmlNodePtr cur) {
    if (cur == NULL)
      xmlGenericError(xmlGenericErrorContext, "null ");
    while (cur != NULL) {
      xmlValidPrintNode(cur);
      cur = cur->next;
    }
}

static void
xmlValidDebug(xmlNodePtr cur, xmlElementContentPtr cont) {
    char expr[5000];

    expr[0] = 0;
    xmlGenericError(xmlGenericErrorContext, "valid: ");
    xmlValidPrintNodeList(cur);
    xmlGenericError(xmlGenericErrorContext, "against ");
    xmlSnprintfElementContent(expr, 5000, cont, 1);
    xmlGenericError(xmlGenericErrorContext, "%s\n", expr);
}

static void
xmlValidDebugState(xmlValidStatePtr state) {
    xmlGenericError(xmlGenericErrorContext, "(");
    if (state->cont == NULL)
      xmlGenericError(xmlGenericErrorContext, "null,");
    else
      switch (state->cont->type) {
            case XML_ELEMENT_CONTENT_PCDATA:
            xmlGenericError(xmlGenericErrorContext, "pcdata,");
            break;
            case XML_ELEMENT_CONTENT_ELEMENT:
            xmlGenericError(xmlGenericErrorContext, "%s,",
                          state->cont->name);
            break;
            case XML_ELEMENT_CONTENT_SEQ:
            xmlGenericError(xmlGenericErrorContext, "seq,");
            break;
            case XML_ELEMENT_CONTENT_OR:
            xmlGenericError(xmlGenericErrorContext, "or,");
            break;
      }
    xmlValidPrintNode(state->node);
    xmlGenericError(xmlGenericErrorContext, ",%d,%X,%d)",
          state->depth, state->occurs, state->state);
}

static void
xmlValidStateDebug(xmlValidCtxtPtr ctxt) {
    int i, j;

    xmlGenericError(xmlGenericErrorContext, "state: ");
    xmlValidDebugState(ctxt->vstate);
    xmlGenericError(xmlGenericErrorContext, " stack: %d ",
          ctxt->vstateNr - 1);
    for (i = 0, j = ctxt->vstateNr - 1;(i < 3) && (j > 0);i++,j--)
      xmlValidDebugState(&ctxt->vstateTab[j]);
    xmlGenericError(xmlGenericErrorContext, "\n");
}

/*****
#define DEBUG_VALID_STATE(n,c) xmlValidDebug(n,c);
 *****/

#define DEBUG_VALID_STATE(n,c) xmlValidStateDebug(ctxt);
#define DEBUG_VALID_MSG(m)                            \
    xmlGenericError(xmlGenericErrorContext, "%s\n", m);
        
#else
#define DEBUG_VALID_STATE(n,c)
#define DEBUG_VALID_MSG(m)
#endif

/* TODO: use hash table for accesses to elem and attribute definitions */


#define CHECK_DTD                               \
   if (doc == NULL) return(0);                              \
   else if ((doc->intSubset == NULL) &&                     \
          (doc->extSubset == NULL)) return(0)

xmlAttributePtr xmlScanAttributeDecl(xmlDtdPtr dtd, const xmlChar *elem);

#ifdef LIBXML_REGEXP_ENABLED

/************************************************************************
 *                                                    *
 *          Content model validation based on the regexps         *
 *                                                    *
 ************************************************************************/

/**
 * xmlValidBuildAContentModel:
 * @content:  the content model
 * @ctxt:  the schema parser context
 * @name:  the element name whose content is being built
 *
 * Generate the automata sequence needed for that type
 *
 * Returns 1 if successful or 0 in case of error.
 */
static int
xmlValidBuildAContentModel(xmlElementContentPtr content,
                       xmlValidCtxtPtr ctxt,
                       const xmlChar *name) {
    if (content == NULL) {
      xmlErrValidNode(ctxt, NULL, XML_ERR_INTERNAL_ERROR,
                  "Found NULL content in content model of %s\n",
                  name, NULL, NULL);
      return(0);
    }
    switch (content->type) {
      case XML_ELEMENT_CONTENT_PCDATA:
          xmlErrValidNode(ctxt, NULL, XML_ERR_INTERNAL_ERROR,
                      "Found PCDATA in content model of %s\n",
                        name, NULL, NULL);
          return(0);
          break;
      case XML_ELEMENT_CONTENT_ELEMENT: {
          xmlAutomataStatePtr oldstate = ctxt->state;
          xmlChar fn[50];
          xmlChar *fullname;
          
          fullname = xmlBuildQName(content->name, content->prefix, fn, 50);
          if (fullname == NULL) {
              xmlVErrMemory(ctxt, "Building content model");
            return(0);
          }

          switch (content->ocur) {
            case XML_ELEMENT_CONTENT_ONCE:
                ctxt->state = xmlAutomataNewTransition(ctxt->am,
                      ctxt->state, NULL, fullname, NULL);
                break;
            case XML_ELEMENT_CONTENT_OPT:
                ctxt->state = xmlAutomataNewTransition(ctxt->am,
                      ctxt->state, NULL, fullname, NULL);
                xmlAutomataNewEpsilon(ctxt->am, oldstate, ctxt->state);
                break;
            case XML_ELEMENT_CONTENT_PLUS:
                ctxt->state = xmlAutomataNewTransition(ctxt->am,
                      ctxt->state, NULL, fullname, NULL);
                xmlAutomataNewTransition(ctxt->am, ctxt->state,
                                       ctxt->state, fullname, NULL);
                break;
            case XML_ELEMENT_CONTENT_MULT:
                ctxt->state = xmlAutomataNewEpsilon(ctxt->am,
                                  ctxt->state, NULL);
                xmlAutomataNewTransition(ctxt->am,
                      ctxt->state, ctxt->state, fullname, NULL);
                break;
          }
          if ((fullname != fn) && (fullname != content->name))
            xmlFree(fullname);
          break;
      }
      case XML_ELEMENT_CONTENT_SEQ: {
          xmlAutomataStatePtr oldstate, oldend;
          xmlElementContentOccur ocur;

          /*
           * Simply iterate over the content
           */
          oldstate = ctxt->state;
          ocur = content->ocur;
          if (ocur != XML_ELEMENT_CONTENT_ONCE) {
            ctxt->state = xmlAutomataNewEpsilon(ctxt->am, oldstate, NULL);
            oldstate = ctxt->state;
          }
          do {
            xmlValidBuildAContentModel(content->c1, ctxt, name);
            content = content->c2;
          } while ((content->type == XML_ELEMENT_CONTENT_SEQ) &&
                 (content->ocur == XML_ELEMENT_CONTENT_ONCE));
          xmlValidBuildAContentModel(content, ctxt, name);
          oldend = ctxt->state;
          ctxt->state = xmlAutomataNewEpsilon(ctxt->am, oldend, NULL);
          switch (ocur) {
            case XML_ELEMENT_CONTENT_ONCE:
                break;
            case XML_ELEMENT_CONTENT_OPT:
                xmlAutomataNewEpsilon(ctxt->am, oldstate, ctxt->state);
                break;
            case XML_ELEMENT_CONTENT_MULT:
                xmlAutomataNewEpsilon(ctxt->am, oldstate, ctxt->state);
                xmlAutomataNewEpsilon(ctxt->am, oldend, oldstate);
                break;
            case XML_ELEMENT_CONTENT_PLUS:
                xmlAutomataNewEpsilon(ctxt->am, oldend, oldstate);
                break;
          }
          break;
      }
      case XML_ELEMENT_CONTENT_OR: {
          xmlAutomataStatePtr oldstate, oldend;
          xmlElementContentOccur ocur;

          ocur = content->ocur;
          if ((ocur == XML_ELEMENT_CONTENT_PLUS) || 
            (ocur == XML_ELEMENT_CONTENT_MULT)) {
            ctxt->state = xmlAutomataNewEpsilon(ctxt->am,
                  ctxt->state, NULL);
          }
          oldstate = ctxt->state;
          oldend = xmlAutomataNewState(ctxt->am);

          /*
           * iterate over the subtypes and remerge the end with an
           * epsilon transition
           */
          do {
            ctxt->state = oldstate;
            xmlValidBuildAContentModel(content->c1, ctxt, name);
            xmlAutomataNewEpsilon(ctxt->am, ctxt->state, oldend);
            content = content->c2;
          } while ((content->type == XML_ELEMENT_CONTENT_OR) &&
                 (content->ocur == XML_ELEMENT_CONTENT_ONCE));
          ctxt->state = oldstate;
          xmlValidBuildAContentModel(content, ctxt, name);
          xmlAutomataNewEpsilon(ctxt->am, ctxt->state, oldend);
          ctxt->state = xmlAutomataNewEpsilon(ctxt->am, oldend, NULL);
          switch (ocur) {
            case XML_ELEMENT_CONTENT_ONCE:
                break;
            case XML_ELEMENT_CONTENT_OPT:
                xmlAutomataNewEpsilon(ctxt->am, oldstate, ctxt->state);
                break;
            case XML_ELEMENT_CONTENT_MULT:
                xmlAutomataNewEpsilon(ctxt->am, oldstate, ctxt->state);
                xmlAutomataNewEpsilon(ctxt->am, oldend, oldstate);
                break;
            case XML_ELEMENT_CONTENT_PLUS:
                xmlAutomataNewEpsilon(ctxt->am, oldend, oldstate);
                break;
          }
          break;
      }
      default:
          xmlErrValid(ctxt, XML_ERR_INTERNAL_ERROR,
                      "ContentModel broken for element %s\n",
                  (const char *) name);
          return(0);
    }
    return(1);
}
/**
 * xmlValidBuildContentModel:
 * @ctxt:  a validation context
 * @elem:  an element declaration node
 *
 * (Re)Build the automata associated to the content model of this
 * element
 *
 * Returns 1 in case of success, 0 in case of error
 */
int
xmlValidBuildContentModel(xmlValidCtxtPtr ctxt, xmlElementPtr elem) {

    if ((ctxt == NULL) || (elem == NULL))
      return(0);
    if (elem->type != XML_ELEMENT_DECL)
      return(0);
    if (elem->etype != XML_ELEMENT_TYPE_ELEMENT)
      return(1);
    /* TODO: should we rebuild in this case ? */
    if (elem->contModel != NULL) {
      if (!xmlRegexpIsDeterminist(elem->contModel)) {
          ctxt->valid = 0;
          return(0);
      }
      return(1);
    }

    ctxt->am = xmlNewAutomata();
    if (ctxt->am == NULL) {
      xmlErrValidNode(ctxt, (xmlNodePtr) elem,
                      XML_ERR_INTERNAL_ERROR,
                      "Cannot create automata for element %s\n",
                    elem->name, NULL, NULL);
      return(0);
    }
    ctxt->state = xmlAutomataGetInitState(ctxt->am);
    xmlValidBuildAContentModel(elem->content, ctxt, elem->name);
    xmlAutomataSetFinalState(ctxt->am, ctxt->state);
    elem->contModel = xmlAutomataCompile(ctxt->am);
    if (xmlRegexpIsDeterminist(elem->contModel) != 1) {
      char expr[5000];
      expr[0] = 0;
      xmlSnprintfElementContent(expr, 5000, elem->content, 1);
      xmlErrValidNode(ctxt, (xmlNodePtr) elem,
                      XML_DTD_CONTENT_NOT_DETERMINIST,
             "Content model of %s is not determinist: %s\n",
             elem->name, BAD_CAST expr, NULL);
#ifdef DEBUG_REGEXP_ALGO
        xmlRegexpPrint(stderr, elem->contModel);
#endif
        ctxt->valid = 0;
      ctxt->state = NULL;
      xmlFreeAutomata(ctxt->am);
      ctxt->am = NULL;
      return(0);
    }
    ctxt->state = NULL;
    xmlFreeAutomata(ctxt->am);
    ctxt->am = NULL;
    return(1);
}

#endif /* LIBXML_REGEXP_ENABLED */

/****************************************************************
 *                                              *
 *    Util functions for data allocation/deallocation       *
 *                                              *
 ****************************************************************/

/**
 * xmlNewValidCtxt:
 *
 * Allocate a validation context structure.
 *
 * Returns NULL if not, otherwise the new validation context structure
 */
xmlValidCtxtPtr xmlNewValidCtxt(void) {
    xmlValidCtxtPtr ret;

    if ((ret = xmlMalloc(sizeof (xmlValidCtxt))) == NULL) {
      xmlVErrMemory(NULL, "malloc failed");
      return (NULL);
    }

    (void) memset(ret, 0, sizeof (xmlValidCtxt));

    return (ret);
}

/**
 * xmlFreeValidCtxt:
 * @cur:  the validation context to free
 *
 * Free a validation context structure.
 */
void
xmlFreeValidCtxt(xmlValidCtxtPtr cur) {
    if (cur->vstateTab != NULL)
        xmlFree(cur->vstateTab);
    if (cur->nodeTab != NULL)
        xmlFree(cur->nodeTab);
    xmlFree(cur);
}

#endif /* LIBXML_VALID_ENABLED */

/**
 * xmlNewDocElementContent:
 * @doc:  the document
 * @name:  the subelement name or NULL
 * @type:  the type of element content decl
 *
 * Allocate an element content structure for the document.
 *
 * Returns NULL if not, otherwise the new element content structure
 */
xmlElementContentPtr
xmlNewDocElementContent(xmlDocPtr doc, const xmlChar *name,
                        xmlElementContentType type) {
    xmlElementContentPtr ret;
    xmlDictPtr dict = NULL;

    if (doc != NULL)
        dict = doc->dict;

    switch(type) {
      case XML_ELEMENT_CONTENT_ELEMENT:
          if (name == NULL) {
              xmlErrValid(NULL, XML_ERR_INTERNAL_ERROR,
                  "xmlNewElementContent : name == NULL !\n",
                  NULL);
          }
          break;
        case XML_ELEMENT_CONTENT_PCDATA:
      case XML_ELEMENT_CONTENT_SEQ:
      case XML_ELEMENT_CONTENT_OR:
          if (name != NULL) {
              xmlErrValid(NULL, XML_ERR_INTERNAL_ERROR,
                  "xmlNewElementContent : name != NULL !\n",
                  NULL);
          }
          break;
      default:
          xmlErrValid(NULL, XML_ERR_INTERNAL_ERROR, 
                "Internal: ELEMENT content corrupted invalid type\n",
                NULL);
          return(NULL);
    }
    ret = (xmlElementContentPtr) xmlMalloc(sizeof(xmlElementContent));
    if (ret == NULL) {
      xmlVErrMemory(NULL, "malloc failed");
      return(NULL);
    }
    memset(ret, 0, sizeof(xmlElementContent));
    ret->type = type;
    ret->ocur = XML_ELEMENT_CONTENT_ONCE;
    if (name != NULL) {
        int l;
      const xmlChar *tmp;

      tmp = xmlSplitQName3(name, &l);
      if (tmp == NULL) {
          if (dict == NULL)
            ret->name = xmlStrdup(name);
          else
              ret->name = xmlDictLookup(dict, name, -1);
      } else {
          if (dict == NULL) {
            ret->prefix = xmlStrndup(name, l);
            ret->name = xmlStrdup(tmp);
          } else {
              ret->prefix = xmlDictLookup(dict, name, l);
            ret->name = xmlDictLookup(dict, tmp, -1);
          }
      }
    }
    return(ret);
}

/**
 * xmlNewElementContent:
 * @name:  the subelement name or NULL
 * @type:  the type of element content decl
 *
 * Allocate an element content structure.
 * Deprecated in favor of xmlNewDocElementContent
 *
 * Returns NULL if not, otherwise the new element content structure
 */
xmlElementContentPtr
xmlNewElementContent(const xmlChar *name, xmlElementContentType type) {
    return(xmlNewDocElementContent(NULL, name, type));
}

/**
 * xmlCopyDocElementContent:
 * @doc:  the document owning the element declaration
 * @cur:  An element content pointer.
 *
 * Build a copy of an element content description.
 * 
 * Returns the new xmlElementContentPtr or NULL in case of error.
 */
xmlElementContentPtr
xmlCopyDocElementContent(xmlDocPtr doc, xmlElementContentPtr cur) {
    xmlElementContentPtr ret = NULL, prev = NULL, tmp;
    xmlDictPtr dict = NULL;

    if (cur == NULL) return(NULL);

    if (doc != NULL)
        dict = doc->dict;

    ret = (xmlElementContentPtr) xmlMalloc(sizeof(xmlElementContent));
    if (ret == NULL) {
      xmlVErrMemory(NULL, "malloc failed");
      return(NULL);
    }
    memset(ret, 0, sizeof(xmlElementContent));
    ret->type = cur->type;
    ret->ocur = cur->ocur;
    if (cur->name != NULL) {
      if (dict)
          ret->name = xmlDictLookup(dict, cur->name, -1);
      else
          ret->name = xmlStrdup(cur->name);
    }
    
    if (cur->prefix != NULL) {
      if (dict)
          ret->prefix = xmlDictLookup(dict, cur->prefix, -1);
      else
          ret->prefix = xmlStrdup(cur->prefix);
    }
    if (cur->c1 != NULL)
        ret->c1 = xmlCopyDocElementContent(doc, cur->c1);
    if (ret->c1 != NULL)
      ret->c1->parent = ret;
    if (cur->c2 != NULL) {
        prev = ret;
      cur = cur->c2;
      while (cur != NULL) {
          tmp = (xmlElementContentPtr) xmlMalloc(sizeof(xmlElementContent));
          if (tmp == NULL) {
            xmlVErrMemory(NULL, "malloc failed");
            return(ret);
          }
          memset(tmp, 0, sizeof(xmlElementContent));
          tmp->type = cur->type;
          tmp->ocur = cur->ocur;
          prev->c2 = tmp;
          if (cur->name != NULL) {
            if (dict)
                tmp->name = xmlDictLookup(dict, cur->name, -1);
            else
                tmp->name = xmlStrdup(cur->name);
          }
          
          if (cur->prefix != NULL) {
            if (dict)
                tmp->prefix = xmlDictLookup(dict, cur->prefix, -1);
            else
                tmp->prefix = xmlStrdup(cur->prefix);
          }
          if (cur->c1 != NULL)
              tmp->c1 = xmlCopyDocElementContent(doc,cur->c1);
          if (tmp->c1 != NULL)
            tmp->c1->parent = ret;
          prev = tmp;
          cur = cur->c2;
      }
    }
    return(ret);
}

/**
 * xmlCopyElementContent:
 * @cur:  An element content pointer.
 *
 * Build a copy of an element content description.
 * Deprecated, use xmlCopyDocElementContent instead
 * 
 * Returns the new xmlElementContentPtr or NULL in case of error.
 */
xmlElementContentPtr
xmlCopyElementContent(xmlElementContentPtr cur) {
    return(xmlCopyDocElementContent(NULL, cur));
}

/**
 * xmlFreeDocElementContent:
 * @doc: the document owning the element declaration
 * @cur:  the element content tree to free
 *
 * Free an element content structure. The whole subtree is removed.
 */
void
xmlFreeDocElementContent(xmlDocPtr doc, xmlElementContentPtr cur) {
    xmlElementContentPtr next;
    xmlDictPtr dict = NULL;

    if (doc != NULL)
        dict = doc->dict;

    while (cur != NULL) {
        next = cur->c2;
      switch (cur->type) {
          case XML_ELEMENT_CONTENT_PCDATA:
          case XML_ELEMENT_CONTENT_ELEMENT:
          case XML_ELEMENT_CONTENT_SEQ:
          case XML_ELEMENT_CONTENT_OR:
            break;
          default:
            xmlErrValid(NULL, XML_ERR_INTERNAL_ERROR, 
                  "Internal: ELEMENT content corrupted invalid type\n",
                  NULL);
            return;
      }
      if (cur->c1 != NULL) xmlFreeDocElementContent(doc, cur->c1);
      if (dict) {
          if ((cur->name != NULL) && (!xmlDictOwns(dict, cur->name)))
              xmlFree((xmlChar *) cur->name);
          if ((cur->prefix != NULL) && (!xmlDictOwns(dict, cur->prefix)))
              xmlFree((xmlChar *) cur->prefix);
      } else {
          if (cur->name != NULL) xmlFree((xmlChar *) cur->name);
          if (cur->prefix != NULL) xmlFree((xmlChar *) cur->prefix);
      }
      xmlFree(cur);
      cur = next;
    }
}

/**
 * xmlFreeElementContent:
 * @cur:  the element content tree to free
 *
 * Free an element content structure. The whole subtree is removed.
 * Deprecated, use xmlFreeDocElementContent instead
 */
void
xmlFreeElementContent(xmlElementContentPtr cur) {
    xmlFreeDocElementContent(NULL, cur);
}

#ifdef LIBXML_OUTPUT_ENABLED
/**
 * xmlDumpElementContent:
 * @buf:  An XML buffer
 * @content:  An element table
 * @glob: 1 if one must print the englobing parenthesis, 0 otherwise
 *
 * This will dump the content of the element table as an XML DTD definition
 */
static void
xmlDumpElementContent(xmlBufferPtr buf, xmlElementContentPtr content, int glob) {
    if (content == NULL) return;

    if (glob) xmlBufferWriteChar(buf, "(");
    switch (content->type) {
        case XML_ELEMENT_CONTENT_PCDATA:
            xmlBufferWriteChar(buf, "#PCDATA");
          break;
      case XML_ELEMENT_CONTENT_ELEMENT:
          if (content->prefix != NULL) {
            xmlBufferWriteCHAR(buf, content->prefix);
            xmlBufferWriteChar(buf, ":");
          }
          xmlBufferWriteCHAR(buf, content->name);
          break;
      case XML_ELEMENT_CONTENT_SEQ:
          if ((content->c1->type == XML_ELEMENT_CONTENT_OR) ||
              (content->c1->type == XML_ELEMENT_CONTENT_SEQ))
            xmlDumpElementContent(buf, content->c1, 1);
          else
            xmlDumpElementContent(buf, content->c1, 0);
            xmlBufferWriteChar(buf, " , ");
          if ((content->c2->type == XML_ELEMENT_CONTENT_OR) ||
              ((content->c2->type == XML_ELEMENT_CONTENT_SEQ) &&
             (content->c2->ocur != XML_ELEMENT_CONTENT_ONCE)))
            xmlDumpElementContent(buf, content->c2, 1);
          else
            xmlDumpElementContent(buf, content->c2, 0);
          break;
      case XML_ELEMENT_CONTENT_OR:
          if ((content->c1->type == XML_ELEMENT_CONTENT_OR) ||
              (content->c1->type == XML_ELEMENT_CONTENT_SEQ))
            xmlDumpElementContent(buf, content->c1, 1);
          else
            xmlDumpElementContent(buf, content->c1, 0);
            xmlBufferWriteChar(buf, " | ");
          if ((content->c2->type == XML_ELEMENT_CONTENT_SEQ) ||
              ((content->c2->type == XML_ELEMENT_CONTENT_OR) &&
             (content->c2->ocur != XML_ELEMENT_CONTENT_ONCE)))
            xmlDumpElementContent(buf, content->c2, 1);
          else
            xmlDumpElementContent(buf, content->c2, 0);
          break;
      default:
          xmlErrValid(NULL, XML_ERR_INTERNAL_ERROR, 
                "Internal: ELEMENT content corrupted invalid type\n",
                NULL);
    }
    if (glob)
        xmlBufferWriteChar(buf, ")");
    switch (content->ocur) {
        case XML_ELEMENT_CONTENT_ONCE:
          break;
        case XML_ELEMENT_CONTENT_OPT:
          xmlBufferWriteChar(buf, "?");
          break;
        case XML_ELEMENT_CONTENT_MULT:
          xmlBufferWriteChar(buf, "*");
          break;
        case XML_ELEMENT_CONTENT_PLUS:
          xmlBufferWriteChar(buf, "+");
          break;
    }
}

/**
 * xmlSprintfElementContent:
 * @buf:  an output buffer
 * @content:  An element table
 * @englob: 1 if one must print the englobing parenthesis, 0 otherwise
 *
 * Deprecated, unsafe, use xmlSnprintfElementContent
 */
void
xmlSprintfElementContent(char *buf ATTRIBUTE_UNUSED,
                       xmlElementContentPtr content ATTRIBUTE_UNUSED,
                   int englob ATTRIBUTE_UNUSED) {
}
#endif /* LIBXML_OUTPUT_ENABLED */

/**
 * xmlSnprintfElementContent:
 * @buf:  an output buffer
 * @size:  the buffer size
 * @content:  An element table
 * @englob: 1 if one must print the englobing parenthesis, 0 otherwise
 *
 * This will dump the content of the element content definition
 * Intended just for the debug routine
 */
void
xmlSnprintfElementContent(char *buf, int size, xmlElementContentPtr content, int englob) {
    int len;

    if (content == NULL) return;
    len = strlen(buf);
    if (size - len < 50) {
      if ((size - len > 4) && (buf[len - 1] != '.'))
          strcat(buf, " ...");
      return;
    }
    if (englob) strcat(buf, "(");
    switch (content->type) {
        case XML_ELEMENT_CONTENT_PCDATA:
            strcat(buf, "#PCDATA");
          break;
      case XML_ELEMENT_CONTENT_ELEMENT:
          if (content->prefix != NULL) {
            if (size - len < xmlStrlen(content->prefix) + 10) {
                strcat(buf, " ...");
                return;
            }
            strcat(buf, (char *) content->prefix);
            strcat(buf, ":");
          }
          if (size - len < xmlStrlen(content->name) + 10) {
            strcat(buf, " ...");
            return;
          }
          if (content->name != NULL)
            strcat(buf, (char *) content->name);
          break;
      case XML_ELEMENT_CONTENT_SEQ:
          if ((content->c1->type == XML_ELEMENT_CONTENT_OR) ||
              (content->c1->type == XML_ELEMENT_CONTENT_SEQ))
            xmlSnprintfElementContent(buf, size, content->c1, 1);
          else
            xmlSnprintfElementContent(buf, size, content->c1, 0);
          len = strlen(buf);
          if (size - len < 50) {
            if ((size - len > 4) && (buf[len - 1] != '.'))
                strcat(buf, " ...");
            return;
          }
            strcat(buf, " , ");
          if (((content->c2->type == XML_ELEMENT_CONTENT_OR) ||
             (content->c2->ocur != XML_ELEMENT_CONTENT_ONCE)) &&
            (content->c2->type != XML_ELEMENT_CONTENT_ELEMENT))
            xmlSnprintfElementContent(buf, size, content->c2, 1);
          else
            xmlSnprintfElementContent(buf, size, content->c2, 0);
          break;
      case XML_ELEMENT_CONTENT_OR:
          if ((content->c1->type == XML_ELEMENT_CONTENT_OR) ||
              (content->c1->type == XML_ELEMENT_CONTENT_SEQ))
            xmlSnprintfElementContent(buf, size, content->c1, 1);
          else
            xmlSnprintfElementContent(buf, size, content->c1, 0);
          len = strlen(buf);
          if (size - len < 50) {
            if ((size - len > 4) && (buf[len - 1] != '.'))
                strcat(buf, " ...");
            return;
          }
            strcat(buf, " | ");
          if (((content->c2->type == XML_ELEMENT_CONTENT_SEQ) ||
             (content->c2->ocur != XML_ELEMENT_CONTENT_ONCE)) &&
            (content->c2->type != XML_ELEMENT_CONTENT_ELEMENT))
            xmlSnprintfElementContent(buf, size, content->c2, 1);
          else
            xmlSnprintfElementContent(buf, size, content->c2, 0);
          break;
    }
    if (englob)
        strcat(buf, ")");
    switch (content->ocur) {
        case XML_ELEMENT_CONTENT_ONCE:
          break;
        case XML_ELEMENT_CONTENT_OPT:
          strcat(buf, "?");
          break;
        case XML_ELEMENT_CONTENT_MULT:
          strcat(buf, "*");
          break;
        case XML_ELEMENT_CONTENT_PLUS:
          strcat(buf, "+");
          break;
    }
}

/****************************************************************
 *                                              *
 *    Registration of DTD declarations                *
 *                                              *
 ****************************************************************/

/**
 * xmlFreeElement:
 * @elem:  An element
 *
 * Deallocate the memory used by an element definition
 */
static void
xmlFreeElement(xmlElementPtr elem) {
    if (elem == NULL) return;
    xmlUnlinkNode((xmlNodePtr) elem);
    xmlFreeDocElementContent(elem->doc, elem->content);
    if (elem->name != NULL)
      xmlFree((xmlChar *) elem->name);
    if (elem->prefix != NULL)
      xmlFree((xmlChar *) elem->prefix);
#ifdef LIBXML_REGEXP_ENABLED
    if (elem->contModel != NULL)
      xmlRegFreeRegexp(elem->contModel);
#endif
    xmlFree(elem);
}


/**
 * xmlAddElementDecl:
 * @ctxt:  the validation context
 * @dtd:  pointer to the DTD
 * @name:  the entity name
 * @type:  the element type
 * @content:  the element content tree or NULL
 *
 * Register a new element declaration
 *
 * Returns NULL if not, otherwise the entity
 */
xmlElementPtr
xmlAddElementDecl(xmlValidCtxtPtr ctxt,
                  xmlDtdPtr dtd, const xmlChar *name,
                  xmlElementTypeVal type,
              xmlElementContentPtr content) {
    xmlElementPtr ret;
    xmlElementTablePtr table;
    xmlAttributePtr oldAttributes = NULL;
    xmlChar *ns, *uqname;

    if (dtd == NULL) {
      return(NULL);
    }
    if (name == NULL) {
      return(NULL);
    }

    switch (type) {
        case XML_ELEMENT_TYPE_EMPTY:
          if (content != NULL) {
            xmlErrValid(ctxt, XML_ERR_INTERNAL_ERROR, 
                    "xmlAddElementDecl: content != NULL for EMPTY\n",
                  NULL);
            return(NULL);
          }
          break;
      case XML_ELEMENT_TYPE_ANY:
          if (content != NULL) {
            xmlErrValid(ctxt, XML_ERR_INTERNAL_ERROR, 
                    "xmlAddElementDecl: content != NULL for ANY\n",
                  NULL);
            return(NULL);
          }
          break;
      case XML_ELEMENT_TYPE_MIXED:
          if (content == NULL) {
            xmlErrValid(ctxt, XML_ERR_INTERNAL_ERROR, 
                    "xmlAddElementDecl: content == NULL for MIXED\n",
                  NULL);
            return(NULL);
          }
          break;
      case XML_ELEMENT_TYPE_ELEMENT:
          if (content == NULL) {
            xmlErrValid(ctxt, XML_ERR_INTERNAL_ERROR, 
                    "xmlAddElementDecl: content == NULL for ELEMENT\n",
                  NULL);
            return(NULL);
          }
          break;
      default:
          xmlErrValid(ctxt, XML_ERR_INTERNAL_ERROR, 
                "Internal: ELEMENT decl corrupted invalid type\n",
                NULL);
          return(NULL);
    }

    /*
     * check if name is a QName
     */
    uqname = xmlSplitQName2(name, &ns);
    if (uqname != NULL)
      name = uqname;

    /*
     * Create the Element table if needed.
     */
    table = (xmlElementTablePtr) dtd->elements;
    if (table == NULL) {
      xmlDictPtr dict = NULL;

      if (dtd->doc != NULL)
          dict = dtd->doc->dict;
        table = xmlHashCreateDict(0, dict);
      dtd->elements = (void *) table;
    }
    if (table == NULL) {
      xmlVErrMemory(ctxt,
            "xmlAddElementDecl: Table creation failed!\n");
      if (uqname != NULL)
          xmlFree(uqname);
      if (ns != NULL)
          xmlFree(ns);
        return(NULL);
    }

    /*
     * lookup old attributes inserted on an undefined element in the
     * internal subset.
     */
    if ((dtd->doc != NULL) && (dtd->doc->intSubset != NULL)) {
      ret = xmlHashLookup2(dtd->doc->intSubset->elements, name, ns);
      if ((ret != NULL) && (ret->etype == XML_ELEMENT_TYPE_UNDEFINED)) {
          oldAttributes = ret->attributes;
          ret->attributes = NULL;
          xmlHashRemoveEntry2(dtd->doc->intSubset->elements, name, ns, NULL);
          xmlFreeElement(ret);
      }
    }

    /*
     * The element may already be present if one of its attribute
     * was registered first
     */
    ret = xmlHashLookup2(table, name, ns);
    if (ret != NULL) {
      if (ret->etype != XML_ELEMENT_TYPE_UNDEFINED) {
#ifdef LIBXML_VALID_ENABLED
          /*
           * The element is already defined in this DTD.
           */
          xmlErrValidNode(ctxt, (xmlNodePtr) dtd, XML_DTD_ELEM_REDEFINED,
                          "Redefinition of element %s\n",
                      name, NULL, NULL);
#endif /* LIBXML_VALID_ENABLED */
          if (uqname != NULL)
            xmlFree(uqname);
            if (ns != NULL)
              xmlFree(ns);
          return(NULL);
      }
      if (ns != NULL) {
          xmlFree(ns);
          ns = NULL;
      }
    } else {
      ret = (xmlElementPtr) xmlMalloc(sizeof(xmlElement));
      if (ret == NULL) {
          xmlVErrMemory(ctxt, "malloc failed");
          if (uqname != NULL)
            xmlFree(uqname);
            if (ns != NULL)
              xmlFree(ns);
          return(NULL);
      }
      memset(ret, 0, sizeof(xmlElement));
      ret->type = XML_ELEMENT_DECL;

      /*
       * fill the structure.
       */
      ret->name = xmlStrdup(name);
      if (ret->name == NULL) {
          xmlVErrMemory(ctxt, "malloc failed");
          if (uqname != NULL)
            xmlFree(uqname);
            if (ns != NULL)
              xmlFree(ns);
          xmlFree(ret);
          return(NULL);
      }
      ret->prefix = ns;

      /*
       * Validity Check:
       * Insertion must not fail
       */
      if (xmlHashAddEntry2(table, name, ns, ret)) {
#ifdef LIBXML_VALID_ENABLED
          /*
           * The element is already defined in this DTD.
           */
          xmlErrValidNode(ctxt, (xmlNodePtr) dtd, XML_DTD_ELEM_REDEFINED,
                          "Redefinition of element %s\n",
                      name, NULL, NULL);
#endif /* LIBXML_VALID_ENABLED */
          xmlFreeElement(ret);
          if (uqname != NULL)
            xmlFree(uqname);
          return(NULL);
      }
      /*
       * For new element, may have attributes from earlier
       * definition in internal subset
       */
      ret->attributes = oldAttributes;
    }

    /*
     * Finish to fill the structure.
     */
    ret->etype = type;
    /*
     * Avoid a stupid copy when called by the parser
     * and flag it by setting a special parent value
     * so the parser doesn't unallocate it.
     */
    if ((ctxt != NULL) &&
        ((ctxt->finishDtd == XML_CTXT_FINISH_DTD_0) ||
         (ctxt->finishDtd == XML_CTXT_FINISH_DTD_1))) {
      ret->content = content;
      if (content != NULL)
          content->parent = (xmlElementContentPtr) 1;
    } else {
      ret->content = xmlCopyDocElementContent(dtd->doc, content);
    }

    /*
     * Link it to the DTD
     */
    ret->parent = dtd;
    ret->doc = dtd->doc;
    if (dtd->last == NULL) {
      dtd->children = dtd->last = (xmlNodePtr) ret;
    } else {
        dtd->last->next = (xmlNodePtr) ret;
      ret->prev = dtd->last;
      dtd->last = (xmlNodePtr) ret;
    }
    if (uqname != NULL)
      xmlFree(uqname);
    return(ret);
}

/**
 * xmlFreeElementTable:
 * @table:  An element table
 *
 * Deallocate the memory used by an element hash table.
 */
void
xmlFreeElementTable(xmlElementTablePtr table) {
    xmlHashFree(table, (xmlHashDeallocator) xmlFreeElement);
}

#ifdef LIBXML_TREE_ENABLED
/**
 * xmlCopyElement:
 * @elem:  An element
 *
 * Build a copy of an element.
 * 
 * Returns the new xmlElementPtr or NULL in case of error.
 */
static xmlElementPtr
xmlCopyElement(xmlElementPtr elem) {
    xmlElementPtr cur;

    cur = (xmlElementPtr) xmlMalloc(sizeof(xmlElement));
    if (cur == NULL) {
      xmlVErrMemory(NULL, "malloc failed");
      return(NULL);
    }
    memset(cur, 0, sizeof(xmlElement));
    cur->type = XML_ELEMENT_DECL;
    cur->etype = elem->etype;
    if (elem->name != NULL)
      cur->name = xmlStrdup(elem->name);
    else
      cur->name = NULL;
    if (elem->prefix != NULL)
      cur->prefix = xmlStrdup(elem->prefix);
    else
      cur->prefix = NULL;
    cur->content = xmlCopyElementContent(elem->content);
    /* TODO : rebuild the attribute list on the copy */
    cur->attributes = NULL;
    return(cur);
}

/**
 * xmlCopyElementTable:
 * @table:  An element table
 *
 * Build a copy of an element table.
 * 
 * Returns the new xmlElementTablePtr or NULL in case of error.
 */
xmlElementTablePtr
xmlCopyElementTable(xmlElementTablePtr table) {
    return((xmlElementTablePtr) xmlHashCopy(table,
                                        (xmlHashCopier) xmlCopyElement));
}
#endif /* LIBXML_TREE_ENABLED */

#ifdef LIBXML_OUTPUT_ENABLED
/**
 * xmlDumpElementDecl:
 * @buf:  the XML buffer output
 * @elem:  An element table
 *
 * This will dump the content of the element declaration as an XML
 * DTD definition
 */
void
xmlDumpElementDecl(xmlBufferPtr buf, xmlElementPtr elem) {
    if ((buf == NULL) || (elem == NULL))
        return;
    switch (elem->etype) {
      case XML_ELEMENT_TYPE_EMPTY:
          xmlBufferWriteChar(buf, "<!ELEMENT ");
          if (elem->prefix != NULL) {
            xmlBufferWriteCHAR(buf, elem->prefix);
            xmlBufferWriteChar(buf, ":");
          }
          xmlBufferWriteCHAR(buf, elem->name);
          xmlBufferWriteChar(buf, " EMPTY>\n");
          break;
      case XML_ELEMENT_TYPE_ANY:
          xmlBufferWriteChar(buf, "<!ELEMENT ");
          if (elem->prefix != NULL) {
            xmlBufferWriteCHAR(buf, elem->prefix);
            xmlBufferWriteChar(buf, ":");
          }
          xmlBufferWriteCHAR(buf, elem->name);
          xmlBufferWriteChar(buf, " ANY>\n");
          break;
      case XML_ELEMENT_TYPE_MIXED:
          xmlBufferWriteChar(buf, "<!ELEMENT ");
          if (elem->prefix != NULL) {
            xmlBufferWriteCHAR(buf, elem->prefix);
            xmlBufferWriteChar(buf, ":");
          }
          xmlBufferWriteCHAR(buf, elem->name);
          xmlBufferWriteChar(buf, " ");
          xmlDumpElementContent(buf, elem->content, 1);
          xmlBufferWriteChar(buf, ">\n");
          break;
      case XML_ELEMENT_TYPE_ELEMENT:
          xmlBufferWriteChar(buf, "<!ELEMENT ");
          if (elem->prefix != NULL) {
            xmlBufferWriteCHAR(buf, elem->prefix);
            xmlBufferWriteChar(buf, ":");
          }
          xmlBufferWriteCHAR(buf, elem->name);
          xmlBufferWriteChar(buf, " ");
          xmlDumpElementContent(buf, elem->content, 1);
          xmlBufferWriteChar(buf, ">\n");
          break;
      default:
          xmlErrValid(NULL, XML_ERR_INTERNAL_ERROR, 
                "Internal: ELEMENT struct corrupted invalid type\n",
                NULL);
    }
}

/**
 * xmlDumpElementDeclScan:
 * @elem:  An element table
 * @buf:  the XML buffer output
 *
 * This routine is used by the hash scan function.  It just reverses
 * the arguments.
 */
static void
xmlDumpElementDeclScan(xmlElementPtr elem, xmlBufferPtr buf) {
    xmlDumpElementDecl(buf, elem);
}

/**
 * xmlDumpElementTable:
 * @buf:  the XML buffer output
 * @table:  An element table
 *
 * This will dump the content of the element table as an XML DTD definition
 */
void
xmlDumpElementTable(xmlBufferPtr buf, xmlElementTablePtr table) {
    if ((buf == NULL) || (table == NULL))
        return;
    xmlHashScan(table, (xmlHashScanner) xmlDumpElementDeclScan, buf);
}
#endif /* LIBXML_OUTPUT_ENABLED */

/**
 * xmlCreateEnumeration:
 * @name:  the enumeration name or NULL
 *
 * create and initialize an enumeration attribute node.
 *
 * Returns the xmlEnumerationPtr just created or NULL in case
 *                of error.
 */
xmlEnumerationPtr
xmlCreateEnumeration(const xmlChar *name) {
    xmlEnumerationPtr ret;

    ret = (xmlEnumerationPtr) xmlMalloc(sizeof(xmlEnumeration));
    if (ret == NULL) {
      xmlVErrMemory(NULL, "malloc failed");
        return(NULL);
    }
    memset(ret, 0, sizeof(xmlEnumeration));

    if (name != NULL)
        ret->name = xmlStrdup(name);
    return(ret);
}

/**
 * xmlFreeEnumeration:
 * @cur:  the tree to free.
 *
 * free an enumeration attribute node (recursive).
 */
void
xmlFreeEnumeration(xmlEnumerationPtr cur) {
    if (cur == NULL) return;

    if (cur->next != NULL) xmlFreeEnumeration(cur->next);

    if (cur->name != NULL) xmlFree((xmlChar *) cur->name);
    xmlFree(cur);
}

#ifdef LIBXML_TREE_ENABLED
/**
 * xmlCopyEnumeration:
 * @cur:  the tree to copy.
 *
 * Copy an enumeration attribute node (recursive).
 *
 * Returns the xmlEnumerationPtr just created or NULL in case
 *                of error.
 */
xmlEnumerationPtr
xmlCopyEnumeration(xmlEnumerationPtr cur) {
    xmlEnumerationPtr ret;

    if (cur == NULL) return(NULL);
    ret = xmlCreateEnumeration((xmlChar *) cur->name);

    if (cur->next != NULL) ret->next = xmlCopyEnumeration(cur->next);
    else ret->next = NULL;

    return(ret);
}
#endif /* LIBXML_TREE_ENABLED */

#ifdef LIBXML_OUTPUT_ENABLED
/**
 * xmlDumpEnumeration:
 * @buf:  the XML buffer output
 * @enum:  An enumeration
 *
 * This will dump the content of the enumeration
 */
static void
xmlDumpEnumeration(xmlBufferPtr buf, xmlEnumerationPtr cur) {
    if ((buf == NULL) || (cur == NULL))
        return;
    
    xmlBufferWriteCHAR(buf, cur->name);
    if (cur->next == NULL)
      xmlBufferWriteChar(buf, ")");
    else {
      xmlBufferWriteChar(buf, " | ");
      xmlDumpEnumeration(buf, cur->next);
    }
}
#endif /* LIBXML_OUTPUT_ENABLED */

#ifdef LIBXML_VALID_ENABLED
/**
 * xmlScanAttributeDeclCallback:
 * @attr:  the attribute decl
 * @list:  the list to update
 *
 * Callback called by xmlScanAttributeDecl when a new attribute
 * has to be entered in the list.
 */
static void
xmlScanAttributeDeclCallback(xmlAttributePtr attr, xmlAttributePtr *list,
                           const xmlChar* name ATTRIBUTE_UNUSED) {
    attr->nexth = *list;
    *list = attr;
}

/**
 * xmlScanAttributeDecl:
 * @dtd:  pointer to the DTD
 * @elem:  the element name
 *
 * When inserting a new element scan the DtD for existing attributes
 * for that element and initialize the Attribute chain
 *
 * Returns the pointer to the first attribute decl in the chain,
 *         possibly NULL.
 */
xmlAttributePtr
xmlScanAttributeDecl(xmlDtdPtr dtd, const xmlChar *elem) {
    xmlAttributePtr ret = NULL;
    xmlAttributeTablePtr table;

    if (dtd == NULL) {
      return(NULL);
    }
    if (elem == NULL) {
      return(NULL);
    }
    table = (xmlAttributeTablePtr) dtd->attributes;
    if (table == NULL) 
        return(NULL);

    /* WRONG !!! */
    xmlHashScan3(table, NULL, NULL, elem,
              (xmlHashScanner) xmlScanAttributeDeclCallback, &ret);
    return(ret);
}

/**
 * xmlScanIDAttributeDecl:
 * @ctxt:  the validation context
 * @elem:  the element name
 * @err: whether to raise errors here
 *
 * Verify that the element don't have too many ID attributes
 * declared.
 *
 * Returns the number of ID attributes found.
 */
static int
xmlScanIDAttributeDecl(xmlValidCtxtPtr ctxt, xmlElementPtr elem, int err) {
    xmlAttributePtr cur;
    int ret = 0;

    if (elem == NULL) return(0);
    cur = elem->attributes;
    while (cur != NULL) {
        if (cur->atype == XML_ATTRIBUTE_ID) {
          ret ++;
          if ((ret > 1) && (err))
            xmlErrValidNode(ctxt, (xmlNodePtr) elem, XML_DTD_MULTIPLE_ID,
             "Element %s has too many ID attributes defined : %s\n",
                   elem->name, cur->name, NULL);
      }
      cur = cur->nexth;
    }
    return(ret);
}
#endif /* LIBXML_VALID_ENABLED */

/**
 * xmlFreeAttribute:
 * @elem:  An attribute
 *
 * Deallocate the memory used by an attribute definition
 */
static void
xmlFreeAttribute(xmlAttributePtr attr) {
    xmlDictPtr dict;

    if (attr == NULL) return;
    if (attr->doc != NULL)
      dict = attr->doc->dict;
    else
      dict = NULL;
    xmlUnlinkNode((xmlNodePtr) attr);
    if (attr->tree != NULL)
        xmlFreeEnumeration(attr->tree);
    if (dict) {
        if ((attr->elem != NULL) && (!xmlDictOwns(dict, attr->elem)))
          xmlFree((xmlChar *) attr->elem);
        if ((attr->name != NULL) && (!xmlDictOwns(dict, attr->name)))
          xmlFree((xmlChar *) attr->name);
        if ((attr->prefix != NULL) && (!xmlDictOwns(dict, attr->prefix)))
          xmlFree((xmlChar *) attr->prefix);
        if ((attr->defaultValue != NULL) &&
          (!xmlDictOwns(dict, attr->defaultValue)))
          xmlFree((xmlChar *) attr->defaultValue);
    } else {
      if (attr->elem != NULL)
          xmlFree((xmlChar *) attr->elem);
      if (attr->name != NULL)
          xmlFree((xmlChar *) attr->name);
      if (attr->defaultValue != NULL)
          xmlFree((xmlChar *) attr->defaultValue);
      if (attr->prefix != NULL)
          xmlFree((xmlChar *) attr->prefix);
    }
    xmlFree(attr);
}


/**
 * xmlAddAttributeDecl:
 * @ctxt:  the validation context
 * @dtd:  pointer to the DTD
 * @elem:  the element name
 * @name:  the attribute name
 * @ns:  the attribute namespace prefix
 * @type:  the attribute type
 * @def:  the attribute default type
 * @defaultValue:  the attribute default value
 * @tree:  if it's an enumeration, the associated list
 *
 * Register a new attribute declaration
 * Note that @tree becomes the ownership of the DTD
 *
 * Returns NULL if not new, otherwise the attribute decl
 */
xmlAttributePtr
xmlAddAttributeDecl(xmlValidCtxtPtr ctxt,
                    xmlDtdPtr dtd, const xmlChar *elem,
                    const xmlChar *name, const xmlChar *ns,
                xmlAttributeType type, xmlAttributeDefault def,
                const xmlChar *defaultValue, xmlEnumerationPtr tree) {
    xmlAttributePtr ret;
    xmlAttributeTablePtr table;
    xmlElementPtr elemDef;
    xmlDictPtr dict = NULL;

    if (dtd == NULL) {
      xmlFreeEnumeration(tree);
      return(NULL);
    }
    if (name == NULL) {
      xmlFreeEnumeration(tree);
      return(NULL);
    }
    if (elem == NULL) {
      xmlFreeEnumeration(tree);
      return(NULL);
    }
    if (dtd->doc != NULL)
      dict = dtd->doc->dict;

#ifdef LIBXML_VALID_ENABLED
    /*
     * Check the type and possibly the default value.
     */
    switch (type) {
        case XML_ATTRIBUTE_CDATA:
          break;
        case XML_ATTRIBUTE_ID:
          break;
        case XML_ATTRIBUTE_IDREF:
          break;
        case XML_ATTRIBUTE_IDREFS:
          break;
        case XML_ATTRIBUTE_ENTITY:
          break;
        case XML_ATTRIBUTE_ENTITIES:
          break;
        case XML_ATTRIBUTE_NMTOKEN:
          break;
        case XML_ATTRIBUTE_NMTOKENS:
          break;
        case XML_ATTRIBUTE_ENUMERATION:
          break;
        case XML_ATTRIBUTE_NOTATION:
          break;
      default:
          xmlErrValid(ctxt, XML_ERR_INTERNAL_ERROR, 
                "Internal: ATTRIBUTE struct corrupted invalid type\n",
                NULL);
          xmlFreeEnumeration(tree);
          return(NULL);
    }
    if ((defaultValue != NULL) && 
        (!xmlValidateAttributeValue(type, defaultValue))) {
      xmlErrValidNode(ctxt, (xmlNodePtr) dtd, XML_DTD_ATTRIBUTE_DEFAULT,
                      "Attribute %s of %s: invalid default value\n",
                      elem, name, defaultValue);
      defaultValue = NULL;
      if (ctxt != NULL)
          ctxt->valid = 0;
    }
#endif /* LIBXML_VALID_ENABLED */

    /*
     * Check first that an attribute defined in the external subset wasn't
     * already defined in the internal subset
     */
    if ((dtd->doc != NULL) && (dtd->doc->extSubset == dtd) &&
      (dtd->doc->intSubset != NULL) &&
      (dtd->doc->intSubset->attributes != NULL)) {
        ret = xmlHashLookup3(dtd->doc->intSubset->attributes, name, ns, elem);
      if (ret != NULL)
          return(NULL);
    }

    /*
     * Create the Attribute table if needed.
     */
    table = (xmlAttributeTablePtr) dtd->attributes;
    if (table == NULL) {
        table = xmlHashCreateDict(0, dict);
      dtd->attributes = (void *) table;
    }
    if (table == NULL) {
      xmlVErrMemory(ctxt,
            "xmlAddAttributeDecl: Table creation failed!\n");
        return(NULL);
    }


    ret = (xmlAttributePtr) xmlMalloc(sizeof(xmlAttribute));
    if (ret == NULL) {
      xmlVErrMemory(ctxt, "malloc failed");
      return(NULL);
    }
    memset(ret, 0, sizeof(xmlAttribute));
    ret->type = XML_ATTRIBUTE_DECL;

    /*
     * fill the structure.
     */
    ret->atype = type;
    /*
     * doc must be set before possible error causes call
     * to xmlFreeAttribute (because it's used to check on
     * dict use)
     */
    ret->doc = dtd->doc;
    if (dict) {
      ret->name = xmlDictLookup(dict, name, -1);
      ret->prefix = xmlDictLookup(dict, ns, -1);
      ret->elem = xmlDictLookup(dict, elem, -1);
    } else {
      ret->name = xmlStrdup(name);
      ret->prefix = xmlStrdup(ns);
      ret->elem = xmlStrdup(elem);
    }
    ret->def = def;
    ret->tree = tree;
    if (defaultValue != NULL) {
        if (dict)
          ret->defaultValue = xmlDictLookup(dict, defaultValue, -1);
      else
          ret->defaultValue = xmlStrdup(defaultValue);
    }

    /*
     * Validity Check:
     * Search the DTD for previous declarations of the ATTLIST
     */
    if (xmlHashAddEntry3(table, ret->name, ret->prefix, ret->elem, ret) < 0) {
#ifdef LIBXML_VALID_ENABLED
      /*
       * The attribute is already defined in this DTD.
       */
      xmlErrValidWarning(ctxt, (xmlNodePtr) dtd, XML_DTD_ATTRIBUTE_REDEFINED,
             "Attribute %s of element %s: already defined\n",
             name, elem, NULL);
#endif /* LIBXML_VALID_ENABLED */
      xmlFreeAttribute(ret);
      return(NULL);
    }

    /*
     * Validity Check:
     * Multiple ID per element
     */
    elemDef = xmlGetDtdElementDesc2(dtd, elem, 1);
    if (elemDef != NULL) {

#ifdef LIBXML_VALID_ENABLED
        if ((type == XML_ATTRIBUTE_ID) &&
          (xmlScanIDAttributeDecl(NULL, elemDef, 1) != 0)) {
          xmlErrValidNode(ctxt, (xmlNodePtr) dtd, XML_DTD_MULTIPLE_ID,
         "Element %s has too may ID attributes defined : %s\n",
               elem, name, NULL);
          if (ctxt != NULL)
            ctxt->valid = 0;
      }
#endif /* LIBXML_VALID_ENABLED */

      /*
       * Insert namespace default def first they need to be
       * processed first.
       */
      if ((xmlStrEqual(ret->name, BAD_CAST "xmlns")) ||
          ((ret->prefix != NULL &&
           (xmlStrEqual(ret->prefix, BAD_CAST "xmlns"))))) {
          ret->nexth = elemDef->attributes;
          elemDef->attributes = ret;
      } else {
          xmlAttributePtr tmp = elemDef->attributes;

          while ((tmp != NULL) &&
               ((xmlStrEqual(tmp->name, BAD_CAST "xmlns")) ||
                ((ret->prefix != NULL &&
                 (xmlStrEqual(ret->prefix, BAD_CAST "xmlns")))))) {
            if (tmp->nexth == NULL)
                break;
            tmp = tmp->nexth;
          }
          if (tmp != NULL) {
            ret->nexth = tmp->nexth;
              tmp->nexth = ret;
          } else {
            ret->nexth = elemDef->attributes;
            elemDef->attributes = ret;
          }
      }
    }

    /*
     * Link it to the DTD
     */
    ret->parent = dtd;
    if (dtd->last == NULL) {
      dtd->children = dtd->last = (xmlNodePtr) ret;
    } else {
        dtd->last->next = (xmlNodePtr) ret;
      ret->prev = dtd->last;
      dtd->last = (xmlNodePtr) ret;
    }
    return(ret);
}

/**
 * xmlFreeAttributeTable:
 * @table:  An attribute table
 *
 * Deallocate the memory used by an entities hash table.
 */
void
xmlFreeAttributeTable(xmlAttributeTablePtr table) {
    xmlHashFree(table, (xmlHashDeallocator) xmlFreeAttribute);
}

#ifdef LIBXML_TREE_ENABLED
/**
 * xmlCopyAttribute:
 * @attr:  An attribute
 *
 * Build a copy of an attribute.
 * 
 * Returns the new xmlAttributePtr or NULL in case of error.
 */
static xmlAttributePtr
xmlCopyAttribute(xmlAttributePtr attr) {
    xmlAttributePtr cur;

    cur = (xmlAttributePtr) xmlMalloc(sizeof(xmlAttribute));
    if (cur == NULL) {
      xmlVErrMemory(NULL, "malloc failed");
      return(NULL);
    }
    memset(cur, 0, sizeof(xmlAttribute));
    cur->type = XML_ATTRIBUTE_DECL;
    cur->atype = attr->atype;
    cur->def = attr->def;
    cur->tree = xmlCopyEnumeration(attr->tree);
    if (attr->elem != NULL)
      cur->elem = xmlStrdup(attr->elem);
    if (attr->name != NULL)
      cur->name = xmlStrdup(attr->name);
    if (attr->prefix != NULL)
      cur->prefix = xmlStrdup(attr->prefix);
    if (attr->defaultValue != NULL)
      cur->defaultValue = xmlStrdup(attr->defaultValue);
    return(cur);
}

/**
 * xmlCopyAttributeTable:
 * @table:  An attribute table
 *
 * Build a copy of an attribute table.
 * 
 * Returns the new xmlAttributeTablePtr or NULL in case of error.
 */
xmlAttributeTablePtr
xmlCopyAttributeTable(xmlAttributeTablePtr table) {
    return((xmlAttributeTablePtr) xmlHashCopy(table,
                            (xmlHashCopier) xmlCopyAttribute));
}
#endif /* LIBXML_TREE_ENABLED */

#ifdef LIBXML_OUTPUT_ENABLED
/**
 * xmlDumpAttributeDecl:
 * @buf:  the XML buffer output
 * @attr:  An attribute declaration
 *
 * This will dump the content of the attribute declaration as an XML
 * DTD definition
 */
void
xmlDumpAttributeDecl(xmlBufferPtr buf, xmlAttributePtr attr) {
    if ((buf == NULL) || (attr == NULL))
        return;
    xmlBufferWriteChar(buf, "<!ATTLIST ");
    xmlBufferWriteCHAR(buf, attr->elem);
    xmlBufferWriteChar(buf, " ");
    if (attr->prefix != NULL) {
      xmlBufferWriteCHAR(buf, attr->prefix);
      xmlBufferWriteChar(buf, ":");
    }
    xmlBufferWriteCHAR(buf, attr->name);
    switch (attr->atype) {
      case XML_ATTRIBUTE_CDATA:
          xmlBufferWriteChar(buf, " CDATA");
          break;
      case XML_ATTRIBUTE_ID:
          xmlBufferWriteChar(buf, " ID");
          break;
      case XML_ATTRIBUTE_IDREF:
          xmlBufferWriteChar(buf, " IDREF");
          break;
      case XML_ATTRIBUTE_IDREFS:
          xmlBufferWriteChar(buf, " IDREFS");
          break;
      case XML_ATTRIBUTE_ENTITY:
          xmlBufferWriteChar(buf, " ENTITY");
          break;
      case XML_ATTRIBUTE_ENTITIES:
          xmlBufferWriteChar(buf, " ENTITIES");
          break;
      case XML_ATTRIBUTE_NMTOKEN:
          xmlBufferWriteChar(buf, " NMTOKEN");
          break;
      case XML_ATTRIBUTE_NMTOKENS:
          xmlBufferWriteChar(buf, " NMTOKENS");
          break;
      case XML_ATTRIBUTE_ENUMERATION:
          xmlBufferWriteChar(buf, " (");
          xmlDumpEnumeration(buf, attr->tree);
          break;
      case XML_ATTRIBUTE_NOTATION:
          xmlBufferWriteChar(buf, " NOTATION (");
          xmlDumpEnumeration(buf, attr->tree);
          break;
      default:
          xmlErrValid(NULL, XML_ERR_INTERNAL_ERROR, 
                "Internal: ATTRIBUTE struct corrupted invalid type\n",
                NULL);
    }
    switch (attr->def) {
      case XML_ATTRIBUTE_NONE:
          break;
      case XML_ATTRIBUTE_REQUIRED:
          xmlBufferWriteChar(buf, " #REQUIRED");
          break;
      case XML_ATTRIBUTE_IMPLIED:
          xmlBufferWriteChar(buf, " #IMPLIED");
          break;
      case XML_ATTRIBUTE_FIXED:
          xmlBufferWriteChar(buf, " #FIXED");
          break;
      default:
          xmlErrValid(NULL, XML_ERR_INTERNAL_ERROR, 
                "Internal: ATTRIBUTE struct corrupted invalid def\n",
                NULL);
    }
    if (attr->defaultValue != NULL) {
      xmlBufferWriteChar(buf, " ");
      xmlBufferWriteQuotedString(buf, attr->defaultValue);
    }
    xmlBufferWriteChar(buf, ">\n");
}

/**
 * xmlDumpAttributeDeclScan:
 * @attr:  An attribute declaration
 * @buf:  the XML buffer output
 *
 * This is used with the hash scan function - just reverses arguments
 */
static void
xmlDumpAttributeDeclScan(xmlAttributePtr attr, xmlBufferPtr buf) {
    xmlDumpAttributeDecl(buf, attr);
}

/**
 * xmlDumpAttributeTable:
 * @buf:  the XML buffer output
 * @table:  An attribute table
 *
 * This will dump the content of the attribute table as an XML DTD definition
 */
void
xmlDumpAttributeTable(xmlBufferPtr buf, xmlAttributeTablePtr table) {
    if ((buf == NULL) || (table == NULL))
        return;
    xmlHashScan(table, (xmlHashScanner) xmlDumpAttributeDeclScan, buf);
}
#endif /* LIBXML_OUTPUT_ENABLED */

/************************************************************************
 *                                                    *
 *                      NOTATIONs                     *
 *                                                    *
 ************************************************************************/
/**
 * xmlFreeNotation:
 * @not:  A notation
 *
 * Deallocate the memory used by an notation definition
 */
static void
xmlFreeNotation(xmlNotationPtr nota) {
    if (nota == NULL) return;
    if (nota->name != NULL)
      xmlFree((xmlChar *) nota->name);
    if (nota->PublicID != NULL)
      xmlFree((xmlChar *) nota->PublicID);
    if (nota->SystemID != NULL)
      xmlFree((xmlChar *) nota->SystemID);
    xmlFree(nota);
}


/**
 * xmlAddNotationDecl:
 * @dtd:  pointer to the DTD
 * @ctxt:  the validation context
 * @name:  the entity name
 * @PublicID:  the public identifier or NULL
 * @SystemID:  the system identifier or NULL
 *
 * Register a new notation declaration
 *
 * Returns NULL if not, otherwise the entity
 */
xmlNotationPtr
xmlAddNotationDecl(xmlValidCtxtPtr ctxt, xmlDtdPtr dtd,
                 const xmlChar *name,
                   const xmlChar *PublicID, const xmlChar *SystemID) {
    xmlNotationPtr ret;
    xmlNotationTablePtr table;

    if (dtd == NULL) {
      return(NULL);
    }
    if (name == NULL) {
      return(NULL);
    }
    if ((PublicID == NULL) && (SystemID == NULL)) {
      return(NULL);
    }

    /*
     * Create the Notation table if needed.
     */
    table = (xmlNotationTablePtr) dtd->notations;
    if (table == NULL) {
      xmlDictPtr dict = NULL;
      if (dtd->doc != NULL)
          dict = dtd->doc->dict;

        dtd->notations = table = xmlHashCreateDict(0, dict);
    }
    if (table == NULL) {
      xmlVErrMemory(ctxt,
            "xmlAddNotationDecl: Table creation failed!\n");
        return(NULL);
    }

    ret = (xmlNotationPtr) xmlMalloc(sizeof(xmlNotation));
    if (ret == NULL) {
      xmlVErrMemory(ctxt, "malloc failed");
      return(NULL);
    }
    memset(ret, 0, sizeof(xmlNotation));

    /*
     * fill the structure.
     */
    ret->name = xmlStrdup(name);
    if (SystemID != NULL)
        ret->SystemID = xmlStrdup(SystemID);
    if (PublicID != NULL)
        ret->PublicID = xmlStrdup(PublicID);

    /*
     * Validity Check:
     * Check the DTD for previous declarations of the ATTLIST
     */
    if (xmlHashAddEntry(table, name, ret)) {
#ifdef LIBXML_VALID_ENABLED
      xmlErrValid(NULL, XML_DTD_NOTATION_REDEFINED, 
                "xmlAddNotationDecl: %s already defined\n",
                (const char *) name);
#endif /* LIBXML_VALID_ENABLED */
      xmlFreeNotation(ret);
      return(NULL);
    }
    return(ret);
}

/**
 * xmlFreeNotationTable:
 * @table:  An notation table
 *
 * Deallocate the memory used by an entities hash table.
 */
void
xmlFreeNotationTable(xmlNotationTablePtr table) {
    xmlHashFree(table, (xmlHashDeallocator) xmlFreeNotation);
}

#ifdef LIBXML_TREE_ENABLED
/**
 * xmlCopyNotation:
 * @nota:  A notation
 *
 * Build a copy of a notation.
 * 
 * Returns the new xmlNotationPtr or NULL in case of error.
 */
static xmlNotationPtr
xmlCopyNotation(xmlNotationPtr nota) {
    xmlNotationPtr cur;

    cur = (xmlNotationPtr) xmlMalloc(sizeof(xmlNotation));
    if (cur == NULL) {
      xmlVErrMemory(NULL, "malloc failed");
      return(NULL);
    }
    if (nota->name != NULL)
      cur->name = xmlStrdup(nota->name);
    else
      cur->name = NULL;
    if (nota->PublicID != NULL)
      cur->PublicID = xmlStrdup(nota->PublicID);
    else
      cur->PublicID = NULL;
    if (nota->SystemID != NULL)
      cur->SystemID = xmlStrdup(nota->SystemID);
    else
      cur->SystemID = NULL;
    return(cur);
}

/**
 * xmlCopyNotationTable:
 * @table:  A notation table
 *
 * Build a copy of a notation table.
 * 
 * Returns the new xmlNotationTablePtr or NULL in case of error.
 */
xmlNotationTablePtr
xmlCopyNotationTable(xmlNotationTablePtr table) {
    return((xmlNotationTablePtr) xmlHashCopy(table,
                            (xmlHashCopier) xmlCopyNotation));
}
#endif /* LIBXML_TREE_ENABLED */

#ifdef LIBXML_OUTPUT_ENABLED
/**
 * xmlDumpNotationDecl:
 * @buf:  the XML buffer output
 * @nota:  A notation declaration
 *
 * This will dump the content the notation declaration as an XML DTD definition
 */
void
xmlDumpNotationDecl(xmlBufferPtr buf, xmlNotationPtr nota) {
    if ((buf == NULL) || (nota == NULL))
        return;
    xmlBufferWriteChar(buf, "<!NOTATION ");
    xmlBufferWriteCHAR(buf, nota->name);
    if (nota->PublicID != NULL) {
      xmlBufferWriteChar(buf, " PUBLIC ");
      xmlBufferWriteQuotedString(buf, nota->PublicID);
      if (nota->SystemID != NULL) {
          xmlBufferWriteChar(buf, " ");
          xmlBufferWriteQuotedString(buf, nota->SystemID);
      }
    } else {
      xmlBufferWriteChar(buf, " SYSTEM ");
      xmlBufferWriteQuotedString(buf, nota->SystemID);
    }
    xmlBufferWriteChar(buf, " >\n");
}

/**
 * xmlDumpNotationDeclScan:
 * @nota:  A notation declaration
 * @buf:  the XML buffer output
 *
 * This is called with the hash scan function, and just reverses args
 */
static void
xmlDumpNotationDeclScan(xmlNotationPtr nota, xmlBufferPtr buf) {
    xmlDumpNotationDecl(buf, nota);
}

/**
 * xmlDumpNotationTable:
 * @buf:  the XML buffer output
 * @table:  A notation table
 *
 * This will dump the content of the notation table as an XML DTD definition
 */
void
xmlDumpNotationTable(xmlBufferPtr buf, xmlNotationTablePtr table) {
    if ((buf == NULL) || (table == NULL))
        return;
    xmlHashScan(table, (xmlHashScanner) xmlDumpNotationDeclScan, buf);
}
#endif /* LIBXML_OUTPUT_ENABLED */

/************************************************************************
 *                                                    *
 *                      IDs                           *
 *                                                    *
 ************************************************************************/
/**
 * DICT_FREE:
 * @str:  a string
 *
 * Free a string if it is not owned by the "dict" dictionnary in the
 * current scope
 */
#define DICT_FREE(str)                                \
      if ((str) && ((!dict) ||                        \
          (xmlDictOwns(dict, (const xmlChar *)(str)) == 0)))      \
          xmlFree((char *)(str));

/**
 * xmlFreeID:
 * @not:  A id
 *
 * Deallocate the memory used by an id definition
 */
static void
xmlFreeID(xmlIDPtr id) {
    xmlDictPtr dict = NULL;

    if (id == NULL) return;

    if (id->doc != NULL)
        dict = id->doc->dict;

    if (id->value != NULL)
      DICT_FREE(id->value)
    if (id->name != NULL)
      DICT_FREE(id->name)
    xmlFree(id);
}


/**
 * xmlAddID:
 * @ctxt:  the validation context
 * @doc:  pointer to the document
 * @value:  the value name
 * @attr:  the attribute holding the ID
 *
 * Register a new id declaration
 *
 * Returns NULL if not, otherwise the new xmlIDPtr
 */
xmlIDPtr 
xmlAddID(xmlValidCtxtPtr ctxt, xmlDocPtr doc, const xmlChar *value,
         xmlAttrPtr attr) {
    xmlIDPtr ret;
    xmlIDTablePtr table;

    if (doc == NULL) {
      return(NULL);
    }
    if (value == NULL) {
      return(NULL);
    }
    if (attr == NULL) {
      return(NULL);
    }

    /*
     * Create the ID table if needed.
     */
    table = (xmlIDTablePtr) doc->ids;
    if (table == NULL)  {
        doc->ids = table = xmlHashCreateDict(0, doc->dict);
    }
    if (table == NULL) {
      xmlVErrMemory(ctxt,
            "xmlAddID: Table creation failed!\n");
        return(NULL);
    }

    ret = (xmlIDPtr) xmlMalloc(sizeof(xmlID));
    if (ret == NULL) {
      xmlVErrMemory(ctxt, "malloc failed");
      return(NULL);
    }

    /*
     * fill the structure.
     */
    ret->value = xmlStrdup(value);
    ret->doc = doc;
    if ((ctxt != NULL) && (ctxt->vstateNr != 0)) {
      /*
       * Operating in streaming mode, attr is gonna disapear
       */
      if (doc->dict != NULL)
          ret->name = xmlDictLookup(doc->dict, attr->name, -1);
      else
          ret->name = xmlStrdup(attr->name);
      ret->attr = NULL;
    } else {
      ret->attr = attr;
      ret->name = NULL;
    }
    ret->lineno = xmlGetLineNo(attr->parent);

    if (xmlHashAddEntry(table, value, ret) < 0) {
#ifdef LIBXML_VALID_ENABLED
      /*
       * The id is already defined in this DTD.
       */
      if ((ctxt != NULL) && (ctxt->error != NULL)) {
          xmlErrValidNode(ctxt, attr->parent, XML_DTD_ID_REDEFINED,
                          "ID %s already defined\n",
                      value, NULL, NULL);
      }
#endif /* LIBXML_VALID_ENABLED */
      xmlFreeID(ret);
      return(NULL);
    }
    if (attr != NULL)
      attr->atype = XML_ATTRIBUTE_ID;
    return(ret);
}

/**
 * xmlFreeIDTable:
 * @table:  An id table
 *
 * Deallocate the memory used by an ID hash table.
 */
void
xmlFreeIDTable(xmlIDTablePtr table) {
    xmlHashFree(table, (xmlHashDeallocator) xmlFreeID);
}

/**
 * xmlIsID:
 * @doc:  the document
 * @elem:  the element carrying the attribute
 * @attr:  the attribute
 *
 * Determine whether an attribute is of type ID. In case we have DTD(s)
 * then this is done if DTD loading has been requested. In the case
 * of HTML documents parsed with the HTML parser, then ID detection is
 * done systematically.
 *
 * Returns 0 or 1 depending on the lookup result
 */
int
xmlIsID(xmlDocPtr doc, xmlNodePtr elem, xmlAttrPtr attr) {
    if ((attr == NULL) || (attr->name == NULL)) return(0);
    if ((attr->ns != NULL) && (attr->ns->prefix != NULL) &&
        (!strcmp((char *) attr->name, "id")) &&
        (!strcmp((char *) attr->ns->prefix, "xml")))
      return(1);
    if (doc == NULL) return(0);
    if ((doc->intSubset == NULL) && (doc->extSubset == NULL)) {
      return(0);
    } else if (doc->type == XML_HTML_DOCUMENT_NODE) {
        if ((xmlStrEqual(BAD_CAST "id", attr->name)) ||
          ((xmlStrEqual(BAD_CAST "name", attr->name)) &&
          ((elem == NULL) || (xmlStrEqual(elem->name, BAD_CAST "a")))))
          return(1);
      return(0);    
    } else if (elem == NULL) {
      return(0);
    } else {
      xmlAttributePtr attrDecl = NULL;

      xmlChar felem[50], fattr[50];
      xmlChar *fullelemname, *fullattrname;

      fullelemname = (elem->ns != NULL && elem->ns->prefix != NULL) ?
          xmlBuildQName(elem->name, elem->ns->prefix, felem, 50) :
          (xmlChar *)elem->name;

      fullattrname = (attr->ns != NULL && attr->ns->prefix != NULL) ?
          xmlBuildQName(attr->name, attr->ns->prefix, fattr, 50) :
          (xmlChar *)attr->name;

      if (fullelemname != NULL && fullattrname != NULL) {
          attrDecl = xmlGetDtdAttrDesc(doc->intSubset, fullelemname,
                                     fullattrname);
          if ((attrDecl == NULL) && (doc->extSubset != NULL))
            attrDecl = xmlGetDtdAttrDesc(doc->extSubset, fullelemname,
                                   fullattrname);
      }

      if ((fullattrname != fattr) && (fullattrname != attr->name))
          xmlFree(fullattrname);
      if ((fullelemname != felem) && (fullelemname != elem->name))
          xmlFree(fullelemname);

        if ((attrDecl != NULL) && (attrDecl->atype == XML_ATTRIBUTE_ID))
          return(1);
    }
    return(0);
}

/**
 * xmlRemoveID:
 * @doc:  the document
 * @attr:  the attribute
 *
 * Remove the given attribute from the ID table maintained internally.
 *
 * Returns -1 if the lookup failed and 0 otherwise
 */
int
xmlRemoveID(xmlDocPtr doc, xmlAttrPtr attr) {
    xmlIDTablePtr table;
    xmlIDPtr id;
    xmlChar *ID;

    if (doc == NULL) return(-1);
    if (attr == NULL) return(-1);
    table = (xmlIDTablePtr) doc->ids;
    if (table == NULL) 
        return(-1);

    if (attr == NULL)
      return(-1);
    ID = xmlNodeListGetString(doc, attr->children, 1);
    if (ID == NULL)
      return(-1);
    id = xmlHashLookup(table, ID);
    if (id == NULL || id->attr != attr) {
      xmlFree(ID);
      return(-1);
    }
    xmlHashRemoveEntry(table, ID, (xmlHashDeallocator) xmlFreeID);
    xmlFree(ID);
      attr->atype = 0;
    return(0);
}

/**
 * xmlGetID:
 * @doc:  pointer to the document
 * @ID:  the ID value
 *
 * Search the attribute declaring the given ID
 *
 * Returns NULL if not found, otherwise the xmlAttrPtr defining the ID
 */
xmlAttrPtr 
xmlGetID(xmlDocPtr doc, const xmlChar *ID) {
    xmlIDTablePtr table;
    xmlIDPtr id;

    if (doc == NULL) {
      return(NULL);
    }

    if (ID == NULL) {
      return(NULL);
    }

    table = (xmlIDTablePtr) doc->ids;
    if (table == NULL) 
        return(NULL);

    id = xmlHashLookup(table, ID);
    if (id == NULL)
      return(NULL);
    if (id->attr == NULL) {
      /*
       * We are operating on a stream, return a well known reference
       * since the attribute node doesn't exist anymore
       */
      return((xmlAttrPtr) doc);
    }
    return(id->attr);
}

/************************************************************************
 *                                                    *
 *                      Refs                          *
 *                                                    *
 ************************************************************************/
typedef struct xmlRemoveMemo_t 
{
      xmlListPtr l;
      xmlAttrPtr ap;
} xmlRemoveMemo;

typedef xmlRemoveMemo *xmlRemoveMemoPtr;

typedef struct xmlValidateMemo_t 
{
    xmlValidCtxtPtr ctxt;
    const xmlChar *name;
} xmlValidateMemo;

typedef xmlValidateMemo *xmlValidateMemoPtr;

/**
 * xmlFreeRef:
 * @lk:  A list link
 *
 * Deallocate the memory used by a ref definition
 */
static void
xmlFreeRef(xmlLinkPtr lk) {
    xmlRefPtr ref = (xmlRefPtr)xmlLinkGetData(lk);
    if (ref == NULL) return;
    if (ref->value != NULL)
        xmlFree((xmlChar *)ref->value);
    if (ref->name != NULL)
        xmlFree((xmlChar *)ref->name);
    xmlFree(ref);
}

/**
 * xmlFreeRefList:
 * @list_ref:  A list of references.
 *
 * Deallocate the memory used by a list of references
 */
static void
xmlFreeRefList(xmlListPtr list_ref) {
    if (list_ref == NULL) return;
    xmlListDelete(list_ref);
}

/**
 * xmlWalkRemoveRef:
 * @data:  Contents of current link
 * @user:  Value supplied by the user
 *
 * Returns 0 to abort the walk or 1 to continue
 */
static int
xmlWalkRemoveRef(const void *data, const void *user)
{
    xmlAttrPtr attr0 = ((xmlRefPtr)data)->attr;
    xmlAttrPtr attr1 = ((xmlRemoveMemoPtr)user)->ap;
    xmlListPtr ref_list = ((xmlRemoveMemoPtr)user)->l;

    if (attr0 == attr1) { /* Matched: remove and terminate walk */
        xmlListRemoveFirst(ref_list, (void *)data);
        return 0;
    }
    return 1;
}

/**
 * xmlDummyCompare
 * @data0:  Value supplied by the user
 * @data1:  Value supplied by the user
 *
 * Do nothing, return 0. Used to create unordered lists.
 */
static int
xmlDummyCompare(const void *data0 ATTRIBUTE_UNUSED,
                const void *data1 ATTRIBUTE_UNUSED)
{
    return (0);
}

/**
 * xmlAddRef:
 * @ctxt:  the validation context
 * @doc:  pointer to the document
 * @value:  the value name
 * @attr:  the attribute holding the Ref
 *
 * Register a new ref declaration
 *
 * Returns NULL if not, otherwise the new xmlRefPtr
 */
xmlRefPtr 
xmlAddRef(xmlValidCtxtPtr ctxt, xmlDocPtr doc, const xmlChar *value,
    xmlAttrPtr attr) {
    xmlRefPtr ret;
    xmlRefTablePtr table;
    xmlListPtr ref_list;

    if (doc == NULL) {
        return(NULL);
    }
    if (value == NULL) {
        return(NULL);
    }
    if (attr == NULL) {
        return(NULL);
    }

    /*
     * Create the Ref table if needed.
     */
    table = (xmlRefTablePtr) doc->refs;
    if (table == NULL) {
        doc->refs = table = xmlHashCreateDict(0, doc->dict);
    }
    if (table == NULL) {
      xmlVErrMemory(ctxt,
            "xmlAddRef: Table creation failed!\n");
        return(NULL);
    }

    ret = (xmlRefPtr) xmlMalloc(sizeof(xmlRef));
    if (ret == NULL) {
      xmlVErrMemory(ctxt, "malloc failed");
        return(NULL);
    }

    /*
     * fill the structure.
     */
    ret->value = xmlStrdup(value);
    if ((ctxt != NULL) && (ctxt->vstateNr != 0)) {
      /*
       * Operating in streaming mode, attr is gonna disapear
       */
      ret->name = xmlStrdup(attr->name);
      ret->attr = NULL;
    } else {
      ret->name = NULL;
      ret->attr = attr;
    }
    ret->lineno = xmlGetLineNo(attr->parent);

    /* To add a reference :-
     * References are maintained as a list of references,
     * Lookup the entry, if no entry create new nodelist
     * Add the owning node to the NodeList
     * Return the ref
     */

    if (NULL == (ref_list = xmlHashLookup(table, value))) {
        if (NULL == (ref_list = xmlListCreate(xmlFreeRef, xmlDummyCompare))) {
          xmlErrValid(NULL, XML_ERR_INTERNAL_ERROR,
                "xmlAddRef: Reference list creation failed!\n",
                NULL);
          goto failed;
        }
        if (xmlHashAddEntry(table, value, ref_list) < 0) {
            xmlListDelete(ref_list);
          xmlErrValid(NULL, XML_ERR_INTERNAL_ERROR,
                "xmlAddRef: Reference list insertion failed!\n",
                NULL);
          goto failed;
        }
    }
    if (xmlListAppend(ref_list, ret) != 0) {
      xmlErrValid(NULL, XML_ERR_INTERNAL_ERROR,
                "xmlAddRef: Reference list insertion failed!\n",
                NULL);
        goto failed;
    }
    return(ret);
failed:
    if (ret != NULL) {
        if (ret->value != NULL)
          xmlFree((char *)ret->value);
        if (ret->name != NULL)
          xmlFree((char *)ret->name);
        xmlFree(ret);
    }
    return(NULL);
}

/**
 * xmlFreeRefTable:
 * @table:  An ref table
 *
 * Deallocate the memory used by an Ref hash table.
 */
void
xmlFreeRefTable(xmlRefTablePtr table) {
    xmlHashFree(table, (xmlHashDeallocator) xmlFreeRefList);
}

/**
 * xmlIsRef:
 * @doc:  the document
 * @elem:  the element carrying the attribute
 * @attr:  the attribute
 *
 * Determine whether an attribute is of type Ref. In case we have DTD(s)
 * then this is simple, otherwise we use an heuristic: name Ref (upper
 * or lowercase).
 *
 * Returns 0 or 1 depending on the lookup result
 */
int
xmlIsRef(xmlDocPtr doc, xmlNodePtr elem, xmlAttrPtr attr) {
    if (attr == NULL)
        return(0);
    if (doc == NULL) {
        doc = attr->doc;
      if (doc == NULL) return(0);
    }

    if ((doc->intSubset == NULL) && (doc->extSubset == NULL)) {
        return(0);
    } else if (doc->type == XML_HTML_DOCUMENT_NODE) {
        /* TODO @@@ */
        return(0);    
    } else {
        xmlAttributePtr attrDecl;

        if (elem == NULL) return(0);
        attrDecl = xmlGetDtdAttrDesc(doc->intSubset, elem->name, attr->name);
        if ((attrDecl == NULL) && (doc->extSubset != NULL))
            attrDecl = xmlGetDtdAttrDesc(doc->extSubset,
                                     elem->name, attr->name);

      if ((attrDecl != NULL) &&
          (attrDecl->atype == XML_ATTRIBUTE_IDREF ||
           attrDecl->atype == XML_ATTRIBUTE_IDREFS))
      return(1);
    }
    return(0);
}

/**
 * xmlRemoveRef:
 * @doc:  the document
 * @attr:  the attribute
 *
 * Remove the given attribute from the Ref table maintained internally.
 *
 * Returns -1 if the lookup failed and 0 otherwise
 */
int
xmlRemoveRef(xmlDocPtr doc, xmlAttrPtr attr) {
    xmlListPtr ref_list;
    xmlRefTablePtr table;
    xmlChar *ID;
    xmlRemoveMemo target;

    if (doc == NULL) return(-1);
    if (attr == NULL) return(-1);
    table = (xmlRefTablePtr) doc->refs;
    if (table == NULL) 
        return(-1);

    if (attr == NULL)
        return(-1);
    ID = xmlNodeListGetString(doc, attr->children, 1);
    if (ID == NULL)
        return(-1);
    ref_list = xmlHashLookup(table, ID);

    if(ref_list == NULL) {
        xmlFree(ID);
        return (-1);
    }
    /* At this point, ref_list refers to a list of references which
     * have the same key as the supplied attr. Our list of references
     * is ordered by reference address and we don't have that information
     * here to use when removing. We'll have to walk the list and
     * check for a matching attribute, when we find one stop the walk
     * and remove the entry.
     * The list is ordered by reference, so that means we don't have the
     * key. Passing the list and the reference to the walker means we
     * will have enough data to be able to remove the entry.
     */
    target.l = ref_list;
    target.ap = attr;
    
    /* Remove the supplied attr from our list */
    xmlListWalk(ref_list, xmlWalkRemoveRef, &target);

    /*If the list is empty then remove the list entry in the hash */
    if (xmlListEmpty(ref_list))
        xmlHashUpdateEntry(table, ID, NULL, (xmlHashDeallocator)
        xmlFreeRefList);
    xmlFree(ID);
    return(0);
}

/**
 * xmlGetRefs:
 * @doc:  pointer to the document
 * @ID:  the ID value
 *
 * Find the set of references for the supplied ID. 
 *
 * Returns NULL if not found, otherwise node set for the ID.
 */
xmlListPtr 
xmlGetRefs(xmlDocPtr doc, const xmlChar *ID) {
    xmlRefTablePtr table;

    if (doc == NULL) {
        return(NULL);
    }

    if (ID == NULL) {
        return(NULL);
    }

    table = (xmlRefTablePtr) doc->refs;
    if (table == NULL) 
        return(NULL);

    return (xmlHashLookup(table, ID));
}

/************************************************************************
 *                                                    *
 *          Routines for validity checking                        *
 *                                                    *
 ************************************************************************/

/**
 * xmlGetDtdElementDesc:
 * @dtd:  a pointer to the DtD to search
 * @name:  the element name
 *
 * Search the DTD for the description of this element
 *
 * returns the xmlElementPtr if found or NULL
 */

xmlElementPtr
xmlGetDtdElementDesc(xmlDtdPtr dtd, const xmlChar *name) {
    xmlElementTablePtr table;
    xmlElementPtr cur;
    xmlChar *uqname = NULL, *prefix = NULL;

    if ((dtd == NULL) || (name == NULL)) return(NULL);
    if (dtd->elements == NULL)
      return(NULL);
    table = (xmlElementTablePtr) dtd->elements;

    uqname = xmlSplitQName2(name, &prefix);
    if (uqname != NULL)
        name = uqname;
    cur = xmlHashLookup2(table, name, prefix);
    if (prefix != NULL) xmlFree(prefix);
    if (uqname != NULL) xmlFree(uqname);
    return(cur);
}
/**
 * xmlGetDtdElementDesc2:
 * @dtd:  a pointer to the DtD to search
 * @name:  the element name
 * @create:  create an empty description if not found
 *
 * Search the DTD for the description of this element
 *
 * returns the xmlElementPtr if found or NULL
 */

static xmlElementPtr
xmlGetDtdElementDesc2(xmlDtdPtr dtd, const xmlChar *name, int create) {
    xmlElementTablePtr table;
    xmlElementPtr cur;
    xmlChar *uqname = NULL, *prefix = NULL;

    if (dtd == NULL) return(NULL);
    if (dtd->elements == NULL) {
      xmlDictPtr dict = NULL;

      if (dtd->doc != NULL)
          dict = dtd->doc->dict;

      if (!create) 
          return(NULL);
      /*
       * Create the Element table if needed.
       */
      table = (xmlElementTablePtr) dtd->elements;
      if (table == NULL) {
          table = xmlHashCreateDict(0, dict);
          dtd->elements = (void *) table;
      }
      if (table == NULL) {
          xmlVErrMemory(NULL, "element table allocation failed");
          return(NULL);
      }
    }
    table = (xmlElementTablePtr) dtd->elements;

    uqname = xmlSplitQName2(name, &prefix);
    if (uqname != NULL)
        name = uqname;
    cur = xmlHashLookup2(table, name, prefix);
    if ((cur == NULL) && (create)) {
      cur = (xmlElementPtr) xmlMalloc(sizeof(xmlElement));
      if (cur == NULL) {
          xmlVErrMemory(NULL, "malloc failed");
          return(NULL);
      }
      memset(cur, 0, sizeof(xmlElement));
      cur->type = XML_ELEMENT_DECL;

      /*
       * fill the structure.
       */
      cur->name = xmlStrdup(name);
      cur->prefix = xmlStrdup(prefix);
      cur->etype = XML_ELEMENT_TYPE_UNDEFINED;

      xmlHashAddEntry2(table, name, prefix, cur);
    }
    if (prefix != NULL) xmlFree(prefix);
    if (uqname != NULL) xmlFree(uqname);
    return(cur);
}

/**
 * xmlGetDtdQElementDesc:
 * @dtd:  a pointer to the DtD to search
 * @name:  the element name
 * @prefix:  the element namespace prefix
 *
 * Search the DTD for the description of this element
 *
 * returns the xmlElementPtr if found or NULL
 */

xmlElementPtr
xmlGetDtdQElementDesc(xmlDtdPtr dtd, const xmlChar *name,
                    const xmlChar *prefix) {
    xmlElementTablePtr table;

    if (dtd == NULL) return(NULL);
    if (dtd->elements == NULL) return(NULL);
    table = (xmlElementTablePtr) dtd->elements;

    return(xmlHashLookup2(table, name, prefix));
}

/**
 * xmlGetDtdAttrDesc:
 * @dtd:  a pointer to the DtD to search
 * @elem:  the element name
 * @name:  the attribute name
 *
 * Search the DTD for the description of this attribute on
 * this element.
 *
 * returns the xmlAttributePtr if found or NULL
 */

xmlAttributePtr
xmlGetDtdAttrDesc(xmlDtdPtr dtd, const xmlChar *elem, const xmlChar *name) {
    xmlAttributeTablePtr table;
    xmlAttributePtr cur;
    xmlChar *uqname = NULL, *prefix = NULL;

    if (dtd == NULL) return(NULL);
    if (dtd->attributes == NULL) return(NULL);

    table = (xmlAttributeTablePtr) dtd->attributes;
    if (table == NULL)
      return(NULL);

    uqname = xmlSplitQName2(name, &prefix);

    if (uqname != NULL) {
      cur = xmlHashLookup3(table, uqname, prefix, elem);
      if (prefix != NULL) xmlFree(prefix);
      if (uqname != NULL) xmlFree(uqname);
    } else
      cur = xmlHashLookup3(table, name, NULL, elem);
    return(cur);
}

/**
 * xmlGetDtdQAttrDesc:
 * @dtd:  a pointer to the DtD to search
 * @elem:  the element name
 * @name:  the attribute name
 * @prefix:  the attribute namespace prefix
 *
 * Search the DTD for the description of this qualified attribute on
 * this element.
 *
 * returns the xmlAttributePtr if found or NULL
 */

xmlAttributePtr
xmlGetDtdQAttrDesc(xmlDtdPtr dtd, const xmlChar *elem, const xmlChar *name,
                const xmlChar *prefix) {
    xmlAttributeTablePtr table;

    if (dtd == NULL) return(NULL);
    if (dtd->attributes == NULL) return(NULL);
    table = (xmlAttributeTablePtr) dtd->attributes;

    return(xmlHashLookup3(table, name, prefix, elem));
}

/**
 * xmlGetDtdNotationDesc:
 * @dtd:  a pointer to the DtD to search
 * @name:  the notation name
 *
 * Search the DTD for the description of this notation
 *
 * returns the xmlNotationPtr if found or NULL
 */

xmlNotationPtr
xmlGetDtdNotationDesc(xmlDtdPtr dtd, const xmlChar *name) {
    xmlNotationTablePtr table;

    if (dtd == NULL) return(NULL);
    if (dtd->notations == NULL) return(NULL);
    table = (xmlNotationTablePtr) dtd->notations;

    return(xmlHashLookup(table, name));
}

#if defined(LIBXML_VALID_ENABLED) || defined(LIBXML_SCHEMAS_ENABLED)
/**
 * xmlValidateNotationUse:
 * @ctxt:  the validation context
 * @doc:  the document
 * @notationName:  the notation name to check
 *
 * Validate that the given name match a notation declaration.
 * - [ VC: Notation Declared ]
 *
 * returns 1 if valid or 0 otherwise
 */

int
xmlValidateNotationUse(xmlValidCtxtPtr ctxt, xmlDocPtr doc,
                       const xmlChar *notationName) {
    xmlNotationPtr notaDecl;
    if ((doc == NULL) || (doc->intSubset == NULL)) return(-1);

    notaDecl = xmlGetDtdNotationDesc(doc->intSubset, notationName);
    if ((notaDecl == NULL) && (doc->extSubset != NULL))
      notaDecl = xmlGetDtdNotationDesc(doc->extSubset, notationName);

    if ((notaDecl == NULL) && (ctxt != NULL)) {
      xmlErrValidNode(ctxt, (xmlNodePtr) doc, XML_DTD_UNKNOWN_NOTATION,
                      "NOTATION %s is not declared\n",
                    notationName, NULL, NULL);
      return(0);
    }
    return(1);
}
#endif /* LIBXML_VALID_ENABLED or LIBXML_SCHEMAS_ENABLED */

/**
 * xmlIsMixedElement:
 * @doc:  the document
 * @name:  the element name
 *
 * Search in the DtDs whether an element accept Mixed content (or ANY)
 * basically if it is supposed to accept text childs
 *
 * returns 0 if no, 1 if yes, and -1 if no element description is available
 */

int
xmlIsMixedElement(xmlDocPtr doc, const xmlChar *name) {
    xmlElementPtr elemDecl;

    if ((doc == NULL) || (doc->intSubset == NULL)) return(-1);

    elemDecl = xmlGetDtdElementDesc(doc->intSubset, name);
    if ((elemDecl == NULL) && (doc->extSubset != NULL))
      elemDecl = xmlGetDtdElementDesc(doc->extSubset, name);
    if (elemDecl == NULL) return(-1);
    switch (elemDecl->etype) {
      case XML_ELEMENT_TYPE_UNDEFINED:
          return(-1);
      case XML_ELEMENT_TYPE_ELEMENT:
          return(0);
        case XML_ELEMENT_TYPE_EMPTY:
          /*
           * return 1 for EMPTY since we want VC error to pop up
           * on <empty>     </empty> for example
           */
      case XML_ELEMENT_TYPE_ANY:
      case XML_ELEMENT_TYPE_MIXED:
          return(1);
    }
    return(1);
}

#ifdef LIBXML_VALID_ENABLED
/**
 * xmlValidateNameValue:
 * @value:  an Name value
 *
 * Validate that the given value match Name production
 *
 * returns 1 if valid or 0 otherwise
 */

int
xmlValidateNameValue(const xmlChar *value) {
    const xmlChar *cur;
    int val, len;

    if (value == NULL) return(0);
    cur = value;
    val = xmlStringCurrentChar(NULL, cur, &len);
    cur += len;
    if (!IS_LETTER(val) && (val != '_') &&
        (val != ':')) {
      return(0);
    }

    val = xmlStringCurrentChar(NULL, cur, &len);
    cur += len;
    while ((IS_LETTER(val)) || (IS_DIGIT(val)) ||
           (val == '.') || (val == '-') ||
         (val == '_') || (val == ':') || 
         (IS_COMBINING(val)) ||
         (IS_EXTENDER(val))) {
      val = xmlStringCurrentChar(NULL, cur, &len);
      cur += len;
    }

    if (val != 0) return(0);

    return(1);
}

/**
 * xmlValidateNamesValue:
 * @value:  an Names value
 *
 * Validate that the given value match Names production
 *
 * returns 1 if valid or 0 otherwise
 */

int
xmlValidateNamesValue(const xmlChar *value) {
    const xmlChar *cur;
    int val, len;

    if (value == NULL) return(0);
    cur = value;
    val = xmlStringCurrentChar(NULL, cur, &len);
    cur += len;
    
    if (!IS_LETTER(val) && (val != '_') &&
        (val != ':')) {
      return(0);
    }

    val = xmlStringCurrentChar(NULL, cur, &len);
    cur += len;
    while ((IS_LETTER(val)) || (IS_DIGIT(val)) ||
           (val == '.') || (val == '-') ||
         (val == '_') || (val == ':') || 
         (IS_COMBINING(val)) ||
         (IS_EXTENDER(val))) {
      val = xmlStringCurrentChar(NULL, cur, &len);
      cur += len;
    }

    /* Should not test IS_BLANK(val) here -- see erratum E20*/
    while (val == 0x20) {
      while (val == 0x20) {
          val = xmlStringCurrentChar(NULL, cur, &len);
          cur += len;
      }

      if (!IS_LETTER(val) && (val != '_') &&
          (val != ':')) {
          return(0);
      }
      val = xmlStringCurrentChar(NULL, cur, &len);
      cur += len;

      while ((IS_LETTER(val)) || (IS_DIGIT(val)) ||
             (val == '.') || (val == '-') ||
             (val == '_') || (val == ':') || 
             (IS_COMBINING(val)) ||
             (IS_EXTENDER(val))) {
          val = xmlStringCurrentChar(NULL, cur, &len);
          cur += len;
      }
    }

    if (val != 0) return(0);

    return(1);
}

/**
 * xmlValidateNmtokenValue:
 * @value:  an Nmtoken value
 *
 * Validate that the given value match Nmtoken production
 *
 * [ VC: Name Token ]
 * 
 * returns 1 if valid or 0 otherwise
 */

int
xmlValidateNmtokenValue(const xmlChar *value) {
    const xmlChar *cur;
    int val, len;

    if (value == NULL) return(0);
    cur = value;
    val = xmlStringCurrentChar(NULL, cur, &len);
    cur += len;
    
    if (!IS_LETTER(val) && !IS_DIGIT(val) &&
        (val != '.') && (val != '-') &&
        (val != '_') && (val != ':') && 
        (!IS_COMBINING(val)) &&
        (!IS_EXTENDER(val)))
      return(0);

    while ((IS_LETTER(val)) || (IS_DIGIT(val)) ||
           (val == '.') || (val == '-') ||
         (val == '_') || (val == ':') || 
         (IS_COMBINING(val)) ||
         (IS_EXTENDER(val))) {
      val = xmlStringCurrentChar(NULL, cur, &len);
      cur += len;
    }

    if (val != 0) return(0);

    return(1);
}

/**
 * xmlValidateNmtokensValue:
 * @value:  an Nmtokens value
 *
 * Validate that the given value match Nmtokens production
 *
 * [ VC: Name Token ]
 * 
 * returns 1 if valid or 0 otherwise
 */

int
xmlValidateNmtokensValue(const xmlChar *value) {
    const xmlChar *cur;
    int val, len;

    if (value == NULL) return(0);
    cur = value;
    val = xmlStringCurrentChar(NULL, cur, &len);
    cur += len;
    
    while (IS_BLANK(val)) {
      val = xmlStringCurrentChar(NULL, cur, &len);
      cur += len;
    }

    if (!IS_LETTER(val) && !IS_DIGIT(val) &&
        (val != '.') && (val != '-') &&
        (val != '_') && (val != ':') && 
        (!IS_COMBINING(val)) &&
        (!IS_EXTENDER(val)))
      return(0);

    while ((IS_LETTER(val)) || (IS_DIGIT(val)) ||
           (val == '.') || (val == '-') ||
         (val == '_') || (val == ':') || 
         (IS_COMBINING(val)) ||
         (IS_EXTENDER(val))) {
      val = xmlStringCurrentChar(NULL, cur, &len);
      cur += len;
    }

    /* Should not test IS_BLANK(val) here -- see erratum E20*/
    while (val == 0x20) {
      while (val == 0x20) {
          val = xmlStringCurrentChar(NULL, cur, &len);
          cur += len;
      }
      if (val == 0) return(1);

      if (!IS_LETTER(val) && !IS_DIGIT(val) &&
          (val != '.') && (val != '-') &&
          (val != '_') && (val != ':') && 
          (!IS_COMBINING(val)) &&
          (!IS_EXTENDER(val)))
          return(0);

      while ((IS_LETTER(val)) || (IS_DIGIT(val)) ||
             (val == '.') || (val == '-') ||
             (val == '_') || (val == ':') || 
             (IS_COMBINING(val)) ||
             (IS_EXTENDER(val))) {
          val = xmlStringCurrentChar(NULL, cur, &len);
          cur += len;
      }
    }

    if (val != 0) return(0);

    return(1);
}

/**
 * xmlValidateNotationDecl:
 * @ctxt:  the validation context
 * @doc:  a document instance
 * @nota:  a notation definition
 *
 * Try to validate a single notation definition
 * basically it does the following checks as described by the
 * XML-1.0 recommendation:
 *  - it seems that no validity constraint exists on notation declarations
 * But this function get called anyway ...
 *
 * returns 1 if valid or 0 otherwise
 */

int
xmlValidateNotationDecl(xmlValidCtxtPtr ctxt ATTRIBUTE_UNUSED, xmlDocPtr doc ATTRIBUTE_UNUSED,
                         xmlNotationPtr nota ATTRIBUTE_UNUSED) {
    int ret = 1;

    return(ret);
}

/**
 * xmlValidateAttributeValue:
 * @type:  an attribute type
 * @value:  an attribute value
 *
 * Validate that the given attribute value match  the proper production
 *
 * [ VC: ID ]
 * Values of type ID must match the Name production....
 *
 * [ VC: IDREF ]
 * Values of type IDREF must match the Name production, and values
 * of type IDREFS must match Names ...
 *
 * [ VC: Entity Name ]
 * Values of type ENTITY must match the Name production, values
 * of type ENTITIES must match Names ...
 *
 * [ VC: Name Token ]
 * Values of type NMTOKEN must match the Nmtoken production; values
 * of type NMTOKENS must match Nmtokens. 
 *
 * returns 1 if valid or 0 otherwise
 */

int
xmlValidateAttributeValue(xmlAttributeType type, const xmlChar *value) {
    switch (type) {
      case XML_ATTRIBUTE_ENTITIES:
      case XML_ATTRIBUTE_IDREFS:
          return(xmlValidateNamesValue(value));
      case XML_ATTRIBUTE_ENTITY:
      case XML_ATTRIBUTE_IDREF:
      case XML_ATTRIBUTE_ID:
      case XML_ATTRIBUTE_NOTATION:
          return(xmlValidateNameValue(value));
      case XML_ATTRIBUTE_NMTOKENS:
      case XML_ATTRIBUTE_ENUMERATION:
          return(xmlValidateNmtokensValue(value));
      case XML_ATTRIBUTE_NMTOKEN:
          return(xmlValidateNmtokenValue(value));
        case XML_ATTRIBUTE_CDATA:
          break;
    }
    return(1);
}

/**
 * xmlValidateAttributeValue2:
 * @ctxt:  the validation context
 * @doc:  the document
 * @name:  the attribute name (used for error reporting only)
 * @type:  the attribute type
 * @value:  the attribute value
 *
 * Validate that the given attribute value match a given type.
 * This typically cannot be done before having finished parsing
 * the subsets.
 *
 * [ VC: IDREF ]
 * Values of type IDREF must match one of the declared IDs
 * Values of type IDREFS must match a sequence of the declared IDs
 * each Name must match the value of an ID attribute on some element
 * in the XML document; i.e. IDREF values must match the value of
 * some ID attribute
 *
 * [ VC: Entity Name ]
 * Values of type ENTITY must match one declared entity
 * Values of type ENTITIES must match a sequence of declared entities
 *
 * [ VC: Notation Attributes ]
 * all notation names in the declaration must be declared.
 *
 * returns 1 if valid or 0 otherwise
 */

static int
xmlValidateAttributeValue2(xmlValidCtxtPtr ctxt, xmlDocPtr doc,
      const xmlChar *name, xmlAttributeType type, const xmlChar *value) {
    int ret = 1;
    switch (type) {
      case XML_ATTRIBUTE_IDREFS:
      case XML_ATTRIBUTE_IDREF:
      case XML_ATTRIBUTE_ID:
      case XML_ATTRIBUTE_NMTOKENS:
      case XML_ATTRIBUTE_ENUMERATION:
      case XML_ATTRIBUTE_NMTOKEN:
        case XML_ATTRIBUTE_CDATA:
          break;
      case XML_ATTRIBUTE_ENTITY: {
          xmlEntityPtr ent;

          ent = xmlGetDocEntity(doc, value);
          /* yeah it's a bit messy... */
          if ((ent == NULL) && (doc->standalone == 1)) {
            doc->standalone = 0;
            ent = xmlGetDocEntity(doc, value);
          } 
          if (ent == NULL) {
            xmlErrValidNode(ctxt, (xmlNodePtr) doc,
                        XML_DTD_UNKNOWN_ENTITY,
   "ENTITY attribute %s reference an unknown entity \"%s\"\n",
                   name, value, NULL);
            ret = 0;
          } else if (ent->etype != XML_EXTERNAL_GENERAL_UNPARSED_ENTITY) {
            xmlErrValidNode(ctxt, (xmlNodePtr) doc,
                        XML_DTD_ENTITY_TYPE,
   "ENTITY attribute %s reference an entity \"%s\" of wrong type\n",
                   name, value, NULL);
            ret = 0;
          }
          break;
        }
      case XML_ATTRIBUTE_ENTITIES: {
          xmlChar *dup, *nam = NULL, *cur, save;
          xmlEntityPtr ent;

          dup = xmlStrdup(value);
          if (dup == NULL)
            return(0);
          cur = dup;
          while (*cur != 0) {
            nam = cur;
            while ((*cur != 0) && (!IS_BLANK_CH(*cur))) cur++;
            save = *cur;
            *cur = 0;
            ent = xmlGetDocEntity(doc, nam);
            if (ent == NULL) {
                xmlErrValidNode(ctxt, (xmlNodePtr) doc,
                            XML_DTD_UNKNOWN_ENTITY,
       "ENTITIES attribute %s reference an unknown entity \"%s\"\n",
                     name, nam, NULL);
                ret = 0;
            } else if (ent->etype != XML_EXTERNAL_GENERAL_UNPARSED_ENTITY) {
                xmlErrValidNode(ctxt, (xmlNodePtr) doc,
                            XML_DTD_ENTITY_TYPE,
       "ENTITIES attribute %s reference an entity \"%s\" of wrong type\n",
                     name, nam, NULL);
                ret = 0;
            }
            if (save == 0)
                break;
            *cur = save;
            while (IS_BLANK_CH(*cur)) cur++;
          }
          xmlFree(dup);
          break;
      }
      case XML_ATTRIBUTE_NOTATION: {
          xmlNotationPtr nota;

          nota = xmlGetDtdNotationDesc(doc->intSubset, value);
          if ((nota == NULL) && (doc->extSubset != NULL))
            nota = xmlGetDtdNotationDesc(doc->extSubset, value);

          if (nota == NULL) {
            xmlErrValidNode(ctxt, (xmlNodePtr) doc,
                            XML_DTD_UNKNOWN_NOTATION,
       "NOTATION attribute %s reference an unknown notation \"%s\"\n",
                   name, value, NULL);
            ret = 0;
          }
          break;
        }
    }
    return(ret);
}

/**
 * xmlValidCtxtNormalizeAttributeValue:
 * @ctxt: the validation context
 * @doc:  the document
 * @elem:  the parent
 * @name:  the attribute name
 * @value:  the attribute value
 * @ctxt:  the validation context or NULL
 *
 * Does the validation related extra step of the normalization of attribute
 * values:
 *
 * If the declared value is not CDATA, then the XML processor must further
 * process the normalized attribute value by discarding any leading and
 * trailing space (#x20) characters, and by replacing sequences of space
 * (#x20) characters by single space (#x20) character.
 *
 * Also  check VC: Standalone Document Declaration in P32, and update
 *  ctxt->valid accordingly
 *
 * returns a new normalized string if normalization is needed, NULL otherwise
 *      the caller must free the returned value.
 */

xmlChar *
xmlValidCtxtNormalizeAttributeValue(xmlValidCtxtPtr ctxt, xmlDocPtr doc,
           xmlNodePtr elem, const xmlChar *name, const xmlChar *value) {
    xmlChar *ret, *dst;
    const xmlChar *src;
    xmlAttributePtr attrDecl = NULL;
    int extsubset = 0;

    if (doc == NULL) return(NULL);
    if (elem == NULL) return(NULL);
    if (name == NULL) return(NULL);
    if (value == NULL) return(NULL);

    if ((elem->ns != NULL) && (elem->ns->prefix != NULL)) {
      xmlChar fn[50];
      xmlChar *fullname;
      
      fullname = xmlBuildQName(elem->name, elem->ns->prefix, fn, 50);
      if (fullname == NULL)
          return(NULL);
      attrDecl = xmlGetDtdAttrDesc(doc->intSubset, fullname, name);
      if ((attrDecl == NULL) && (doc->extSubset != NULL)) {
          attrDecl = xmlGetDtdAttrDesc(doc->extSubset, fullname, name);
          if (attrDecl != NULL)
            extsubset = 1;
      }
      if ((fullname != fn) && (fullname != elem->name))
          xmlFree(fullname);
    }
    if ((attrDecl == NULL) && (doc->intSubset != NULL))
      attrDecl = xmlGetDtdAttrDesc(doc->intSubset, elem->name, name);
    if ((attrDecl == NULL) && (doc->extSubset != NULL)) {
      attrDecl = xmlGetDtdAttrDesc(doc->extSubset, elem->name, name);
      if (attrDecl != NULL)
          extsubset = 1;
    }

    if (attrDecl == NULL)
      return(NULL);
    if (attrDecl->atype == XML_ATTRIBUTE_CDATA)
      return(NULL);

    ret = xmlStrdup(value);
    if (ret == NULL)
      return(NULL);
    src = value;
    dst = ret;
    while (*src == 0x20) src++;
    while (*src != 0) {
      if (*src == 0x20) {
          while (*src == 0x20) src++;
          if (*src != 0)
            *dst++ = 0x20;
      } else {
          *dst++ = *src++;
      }
    }
    *dst = 0;
    if ((doc->standalone) && (extsubset == 1) && (!xmlStrEqual(value, ret))) {
      xmlErrValidNode(ctxt, elem, XML_DTD_NOT_STANDALONE,
"standalone: %s on %s value had to be normalized based on external subset declaration\n",
             name, elem->name, NULL);
      ctxt->valid = 0;
    }
    return(ret);
}

/**
 * xmlValidNormalizeAttributeValue:
 * @doc:  the document
 * @elem:  the parent
 * @name:  the attribute name
 * @value:  the attribute value
 *
 * Does the validation related extra step of the normalization of attribute
 * values:
 *
 * If the declared value is not CDATA, then the XML processor must further
 * process the normalized attribute value by discarding any leading and
 * trailing space (#x20) characters, and by replacing sequences of space
 * (#x20) characters by single space (#x20) character.
 *
 * Returns a new normalized string if normalization is needed, NULL otherwise
 *      the caller must free the returned value.
 */

xmlChar *
xmlValidNormalizeAttributeValue(xmlDocPtr doc, xmlNodePtr elem,
                          const xmlChar *name, const xmlChar *value) {
    xmlChar *ret, *dst;
    const xmlChar *src;
    xmlAttributePtr attrDecl = NULL;

    if (doc == NULL) return(NULL);
    if (elem == NULL) return(NULL);
    if (name == NULL) return(NULL);
    if (value == NULL) return(NULL);

    if ((elem->ns != NULL) && (elem->ns->prefix != NULL)) {
      xmlChar fn[50];
      xmlChar *fullname;
      
      fullname = xmlBuildQName(elem->name, elem->ns->prefix, fn, 50);
      if (fullname == NULL)
          return(NULL);
      attrDecl = xmlGetDtdAttrDesc(doc->intSubset, fullname, name);
      if ((attrDecl == NULL) && (doc->extSubset != NULL))
          attrDecl = xmlGetDtdAttrDesc(doc->extSubset, fullname, name);
      if ((fullname != fn) && (fullname != elem->name))
          xmlFree(fullname);
    }
    attrDecl = xmlGetDtdAttrDesc(doc->intSubset, elem->name, name);
    if ((attrDecl == NULL) && (doc->extSubset != NULL))
      attrDecl = xmlGetDtdAttrDesc(doc->extSubset, elem->name, name);

    if (attrDecl == NULL)
      return(NULL);
    if (attrDecl->atype == XML_ATTRIBUTE_CDATA)
      return(NULL);

    ret = xmlStrdup(value);
    if (ret == NULL)
      return(NULL);
    src = value;
    dst = ret;
    while (*src == 0x20) src++;
    while (*src != 0) {
      if (*src == 0x20) {
          while (*src == 0x20) src++;
          if (*src != 0)
            *dst++ = 0x20;
      } else {
          *dst++ = *src++;
      }
    }
    *dst = 0;
    return(ret);
}

static void
xmlValidateAttributeIdCallback(xmlAttributePtr attr, int *count,
                             const xmlChar* name ATTRIBUTE_UNUSED) {
    if (attr->atype == XML_ATTRIBUTE_ID) (*count)++;
}

/**
 * xmlValidateAttributeDecl:
 * @ctxt:  the validation context
 * @doc:  a document instance
 * @attr:  an attribute definition
 *
 * Try to validate a single attribute definition
 * basically it does the following checks as described by the
 * XML-1.0 recommendation:
 *  - [ VC: Attribute Default Legal ]
 *  - [ VC: Enumeration ]
 *  - [ VC: ID Attribute Default ]
 *
 * The ID/IDREF uniqueness and matching are done separately
 *
 * returns 1 if valid or 0 otherwise
 */

int
xmlValidateAttributeDecl(xmlValidCtxtPtr ctxt, xmlDocPtr doc,
                         xmlAttributePtr attr) {
    int ret = 1;
    int val;
    CHECK_DTD;
    if(attr == NULL) return(1);
    
    /* Attribute Default Legal */
    /* Enumeration */
    if (attr->defaultValue != NULL) {
      val = xmlValidateAttributeValue(attr->atype, attr->defaultValue);
      if (val == 0) {
          xmlErrValidNode(ctxt, (xmlNodePtr) attr, XML_DTD_ATTRIBUTE_DEFAULT,
             "Syntax of default value for attribute %s of %s is not valid\n",
                 attr->name, attr->elem, NULL);
      }
        ret &= val;
    }

    /* ID Attribute Default */
    if ((attr->atype == XML_ATTRIBUTE_ID)&&
        (attr->def != XML_ATTRIBUTE_IMPLIED) &&
      (attr->def != XML_ATTRIBUTE_REQUIRED)) {
      xmlErrValidNode(ctxt, (xmlNodePtr) attr, XML_DTD_ID_FIXED,
          "ID attribute %s of %s is not valid must be #IMPLIED or #REQUIRED\n",
             attr->name, attr->elem, NULL);
      ret = 0;
    }

    /* One ID per Element Type */
    if (attr->atype == XML_ATTRIBUTE_ID) {
        int nbId;

      /* the trick is that we parse DtD as their own internal subset */
        xmlElementPtr elem = xmlGetDtdElementDesc(doc->intSubset,
                                                attr->elem);
      if (elem != NULL) {
          nbId = xmlScanIDAttributeDecl(NULL, elem, 0);
      } else {
          xmlAttributeTablePtr table;

          /*
           * The attribute may be declared in the internal subset and the
           * element in the external subset.
           */
          nbId = 0;
          if (doc->intSubset != NULL) {
            table = (xmlAttributeTablePtr) doc->intSubset->attributes;
            xmlHashScan3(table, NULL, NULL, attr->elem, (xmlHashScanner)
                       xmlValidateAttributeIdCallback, &nbId);
          }
      }
      if (nbId > 1) {
          
          xmlErrValidNodeNr(ctxt, (xmlNodePtr) attr, XML_DTD_ID_SUBSET,
       "Element %s has %d ID attribute defined in the internal subset : %s\n",
               attr->elem, nbId, attr->name);
      } else if (doc->extSubset != NULL) {
          int extId = 0;
          elem = xmlGetDtdElementDesc(doc->extSubset, attr->elem);
          if (elem != NULL) {
            extId = xmlScanIDAttributeDecl(NULL, elem, 0);
          }
          if (extId > 1) {
            xmlErrValidNodeNr(ctxt, (xmlNodePtr) attr, XML_DTD_ID_SUBSET,
       "Element %s has %d ID attribute defined in the external subset : %s\n",
                   attr->elem, extId, attr->name);
          } else if (extId + nbId > 1) {
            xmlErrValidNode(ctxt, (xmlNodePtr) attr, XML_DTD_ID_SUBSET,
"Element %s has ID attributes defined in the internal and external subset : %s\n",
                   attr->elem, attr->name, NULL);
          }
      }
    }

    /* Validity Constraint: Enumeration */
    if ((attr->defaultValue != NULL) && (attr->tree != NULL)) {
        xmlEnumerationPtr tree = attr->tree;
      while (tree != NULL) {
          if (xmlStrEqual(tree->name, attr->defaultValue)) break;
          tree = tree->next;
      }
      if (tree == NULL) {
          xmlErrValidNode(ctxt, (xmlNodePtr) attr, XML_DTD_ATTRIBUTE_VALUE,
"Default value \"%s\" for attribute %s of %s is not among the enumerated set\n",
               attr->defaultValue, attr->name, attr->elem);
          ret = 0;
      }
    }

    return(ret);
}

/**
 * xmlValidateElementDecl:
 * @ctxt:  the validation context
 * @doc:  a document instance
 * @elem:  an element definition
 *
 * Try to validate a single element definition
 * basically it does the following checks as described by the
 * XML-1.0 recommendation:
 *  - [ VC: One ID per Element Type ]
 *  - [ VC: No Duplicate Types ]
 *  - [ VC: Unique Element Type Declaration ]
 *
 * returns 1 if valid or 0 otherwise
 */

int
xmlValidateElementDecl(xmlValidCtxtPtr ctxt, xmlDocPtr doc,
                       xmlElementPtr elem) {
    int ret = 1;
    xmlElementPtr tst;

    CHECK_DTD;
    
    if (elem == NULL) return(1);

#if 0
#ifdef LIBXML_REGEXP_ENABLED
    /* Build the regexp associated to the content model */
    ret = xmlValidBuildContentModel(ctxt, elem);
#endif
#endif

    /* No Duplicate Types */
    if (elem->etype == XML_ELEMENT_TYPE_MIXED) {
      xmlElementContentPtr cur, next;
        const xmlChar *name;

      cur = elem->content;
      while (cur != NULL) {
          if (cur->type != XML_ELEMENT_CONTENT_OR) break;
          if (cur->c1 == NULL) break;
          if (cur->c1->type == XML_ELEMENT_CONTENT_ELEMENT) {
            name = cur->c1->name;
            next = cur->c2;
            while (next != NULL) {
                if (next->type == XML_ELEMENT_CONTENT_ELEMENT) {
                    if ((xmlStrEqual(next->name, name)) &&
                      (xmlStrEqual(next->prefix, cur->prefix))) {
                      if (cur->prefix == NULL) {
                        xmlErrValidNode(ctxt, (xmlNodePtr) elem, XML_DTD_CONTENT_ERROR,
               "Definition of %s has duplicate references of %s\n",
                               elem->name, name, NULL);
                      } else {
                        xmlErrValidNode(ctxt, (xmlNodePtr) elem, XML_DTD_CONTENT_ERROR,
               "Definition of %s has duplicate references of %s:%s\n",
                               elem->name, cur->prefix, name);
                      }
                      ret = 0;
                  }
                  break;
                }
                if (next->c1 == NULL) break;
                if (next->c1->type != XML_ELEMENT_CONTENT_ELEMENT) break;
                if ((xmlStrEqual(next->c1->name, name)) &&
                    (xmlStrEqual(next->c1->prefix, cur->prefix))) {
                  if (cur->prefix == NULL) {
                      xmlErrValidNode(ctxt, (xmlNodePtr) elem, XML_DTD_CONTENT_ERROR,
             "Definition of %s has duplicate references to %s\n",
                           elem->name, name, NULL);
                  } else {
                      xmlErrValidNode(ctxt, (xmlNodePtr) elem, XML_DTD_CONTENT_ERROR,
             "Definition of %s has duplicate references to %s:%s\n",
                           elem->name, cur->prefix, name);
                  }
                  ret = 0;
                }
                next = next->c2;
            }
          }
          cur = cur->c2;
      }
    }

    /* VC: Unique Element Type Declaration */
    tst = xmlGetDtdElementDesc(doc->intSubset, elem->name);
    if ((tst != NULL ) && (tst != elem) &&
      ((tst->prefix == elem->prefix) ||
       (xmlStrEqual(tst->prefix, elem->prefix))) &&
      (tst->etype != XML_ELEMENT_TYPE_UNDEFINED)) {
      xmlErrValidNode(ctxt, (xmlNodePtr) elem, XML_DTD_ELEM_REDEFINED,
                      "Redefinition of element %s\n",
                   elem->name, NULL, NULL);
      ret = 0;
    }
    tst = xmlGetDtdElementDesc(doc->extSubset, elem->name);
    if ((tst != NULL ) && (tst != elem) &&
      ((tst->prefix == elem->prefix) ||
       (xmlStrEqual(tst->prefix, elem->prefix))) &&
      (tst->etype != XML_ELEMENT_TYPE_UNDEFINED)) {
      xmlErrValidNode(ctxt, (xmlNodePtr) elem, XML_DTD_ELEM_REDEFINED,
                      "Redefinition of element %s\n",
                   elem->name, NULL, NULL);
      ret = 0;
    }
    /* One ID per Element Type
     * already done when registering the attribute
    if (xmlScanIDAttributeDecl(ctxt, elem) > 1) {
      ret = 0;
    } */
    return(ret);
}

/**
 * xmlValidateOneAttribute:
 * @ctxt:  the validation context
 * @doc:  a document instance
 * @elem:  an element instance
 * @attr:  an attribute instance
 * @value:  the attribute value (without entities processing)
 *
 * Try to validate a single attribute for an element
 * basically it does the following checks as described by the
 * XML-1.0 recommendation:
 *  - [ VC: Attribute Value Type ]
 *  - [ VC: Fixed Attribute Default ]
 *  - [ VC: Entity Name ]
 *  - [ VC: Name Token ]
 *  - [ VC: ID ]
 *  - [ VC: IDREF ]
 *  - [ VC: Entity Name ]
 *  - [ VC: Notation Attributes ]
 *
 * The ID/IDREF uniqueness and matching are done separately
 *
 * returns 1 if valid or 0 otherwise
 */

int
xmlValidateOneAttribute(xmlValidCtxtPtr ctxt, xmlDocPtr doc,
                        xmlNodePtr elem, xmlAttrPtr attr, const xmlChar *value) 
{
    xmlAttributePtr attrDecl =  NULL;
    int val;
    int ret = 1;

    CHECK_DTD;
    if ((elem == NULL) || (elem->name == NULL)) return(0);
    if ((attr == NULL) || (attr->name == NULL)) return(0);

    if ((elem->ns != NULL) && (elem->ns->prefix != NULL)) {
      xmlChar fn[50];
      xmlChar *fullname;
      
      fullname = xmlBuildQName(elem->name, elem->ns->prefix, fn, 50);
      if (fullname == NULL)
          return(0);
      if (attr->ns != NULL) {
          attrDecl = xmlGetDtdQAttrDesc(doc->intSubset, fullname,
                                      attr->name, attr->ns->prefix);
          if ((attrDecl == NULL) && (doc->extSubset != NULL))
            attrDecl = xmlGetDtdQAttrDesc(doc->extSubset, fullname,
                                    attr->name, attr->ns->prefix);
      } else {
          attrDecl = xmlGetDtdAttrDesc(doc->intSubset, fullname, attr->name);
          if ((attrDecl == NULL) && (doc->extSubset != NULL))
            attrDecl = xmlGetDtdAttrDesc(doc->extSubset,
                                   fullname, attr->name);
      }
      if ((fullname != fn) && (fullname != elem->name))
          xmlFree(fullname);
    }
    if (attrDecl == NULL) {
      if (attr->ns != NULL) {
          attrDecl = xmlGetDtdQAttrDesc(doc->intSubset, elem->name,
                                      attr->name, attr->ns->prefix);
          if ((attrDecl == NULL) && (doc->extSubset != NULL))
            attrDecl = xmlGetDtdQAttrDesc(doc->extSubset, elem->name,
                                    attr->name, attr->ns->prefix);
      } else {
          attrDecl = xmlGetDtdAttrDesc(doc->intSubset,
                                     elem->name, attr->name);
          if ((attrDecl == NULL) && (doc->extSubset != NULL))
            attrDecl = xmlGetDtdAttrDesc(doc->extSubset,
                                   elem->name, attr->name);
      }
    }


    /* Validity Constraint: Attribute Value Type */
    if (attrDecl == NULL) {
      xmlErrValidNode(ctxt, elem, XML_DTD_UNKNOWN_ATTRIBUTE,
             "No declaration for attribute %s of element %s\n",
             attr->name, elem->name, NULL);
      return(0);
    }
    attr->atype = attrDecl->atype;

    val = xmlValidateAttributeValue(attrDecl->atype, value);
    if (val == 0) {
          xmlErrValidNode(ctxt, elem, XML_DTD_ATTRIBUTE_VALUE,
         "Syntax of value for attribute %s of %s is not valid\n",
             attr->name, elem->name, NULL);
        ret = 0;
    }

    /* Validity constraint: Fixed Attribute Default */
    if (attrDecl->def == XML_ATTRIBUTE_FIXED) {
      if (!xmlStrEqual(value, attrDecl->defaultValue)) {
          xmlErrValidNode(ctxt, elem, XML_DTD_ATTRIBUTE_DEFAULT,
         "Value for attribute %s of %s is different from default \"%s\"\n",
               attr->name, elem->name, attrDecl->defaultValue);
          ret = 0;
      }
    }

    /* Validity Constraint: ID uniqueness */
    if (attrDecl->atype == XML_ATTRIBUTE_ID) {
        if (xmlAddID(ctxt, doc, value, attr) == NULL)
          ret = 0;
    }

    if ((attrDecl->atype == XML_ATTRIBUTE_IDREF) ||
      (attrDecl->atype == XML_ATTRIBUTE_IDREFS)) {
        if (xmlAddRef(ctxt, doc, value, attr) == NULL)
          ret = 0;
    }

    /* Validity Constraint: Notation Attributes */
    if (attrDecl->atype == XML_ATTRIBUTE_NOTATION) {
        xmlEnumerationPtr tree = attrDecl->tree;
        xmlNotationPtr nota;

        /* First check that the given NOTATION was declared */
      nota = xmlGetDtdNotationDesc(doc->intSubset, value);
      if (nota == NULL)
          nota = xmlGetDtdNotationDesc(doc->extSubset, value);
      
      if (nota == NULL) {
          xmlErrValidNode(ctxt, elem, XML_DTD_UNKNOWN_NOTATION,
       "Value \"%s\" for attribute %s of %s is not a declared Notation\n",
               value, attr->name, elem->name);
          ret = 0;
        }

      /* Second, verify that it's among the list */
      while (tree != NULL) {
          if (xmlStrEqual(tree->name, value)) break;
          tree = tree->next;
      }
      if (tree == NULL) {
          xmlErrValidNode(ctxt, elem, XML_DTD_NOTATION_VALUE,
"Value \"%s\" for attribute %s of %s is not among the enumerated notations\n",
               value, attr->name, elem->name);
          ret = 0;
      }
    }

    /* Validity Constraint: Enumeration */
    if (attrDecl->atype == XML_ATTRIBUTE_ENUMERATION) {
        xmlEnumerationPtr tree = attrDecl->tree;
      while (tree != NULL) {
          if (xmlStrEqual(tree->name, value)) break;
          tree = tree->next;
      }
      if (tree == NULL) {
          xmlErrValidNode(ctxt, elem, XML_DTD_ATTRIBUTE_VALUE,
       "Value \"%s\" for attribute %s of %s is not among the enumerated set\n",
               value, attr->name, elem->name);
          ret = 0;
      }
    }

    /* Fixed Attribute Default */
    if ((attrDecl->def == XML_ATTRIBUTE_FIXED) &&
        (!xmlStrEqual(attrDecl->defaultValue, value))) {
      xmlErrValidNode(ctxt, elem, XML_DTD_ATTRIBUTE_VALUE,
         "Value for attribute %s of %s must be \"%s\"\n",
             attr->name, elem->name, attrDecl->defaultValue);
        ret = 0;
    }

    /* Extra check for the attribute value */
    ret &= xmlValidateAttributeValue2(ctxt, doc, attr->name,
                              attrDecl->atype, value);

    return(ret);
}

/**
 * xmlValidateOneNamespace:
 * @ctxt:  the validation context
 * @doc:  a document instance
 * @elem:  an element instance
 * @prefix:  the namespace prefix
 * @ns:  an namespace declaration instance
 * @value:  the attribute value (without entities processing)
 *
 * Try to validate a single namespace declaration for an element
 * basically it does the following checks as described by the
 * XML-1.0 recommendation:
 *  - [ VC: Attribute Value Type ]
 *  - [ VC: Fixed Attribute Default ]
 *  - [ VC: Entity Name ]
 *  - [ VC: Name Token ]
 *  - [ VC: ID ]
 *  - [ VC: IDREF ]
 *  - [ VC: Entity Name ]
 *  - [ VC: Notation Attributes ]
 *
 * The ID/IDREF uniqueness and matching are done separately
 *
 * returns 1 if valid or 0 otherwise
 */

int
xmlValidateOneNamespace(xmlValidCtxtPtr ctxt, xmlDocPtr doc,
xmlNodePtr elem, const xmlChar *prefix, xmlNsPtr ns, const xmlChar *value) {
    /* xmlElementPtr elemDecl; */
    xmlAttributePtr attrDecl =  NULL;
    int val;
    int ret = 1;

    CHECK_DTD;
    if ((elem == NULL) || (elem->name == NULL)) return(0);
    if ((ns == NULL) || (ns->href == NULL)) return(0);

    if (prefix != NULL) {
      xmlChar fn[50];
      xmlChar *fullname;
      
      fullname = xmlBuildQName(elem->name, prefix, fn, 50);
      if (fullname == NULL) {
          xmlVErrMemory(ctxt, "Validating namespace");
          return(0);
      }
      if (ns->prefix != NULL) {
          attrDecl = xmlGetDtdQAttrDesc(doc->intSubset, fullname,
                                      ns->prefix, BAD_CAST "xmlns");
          if ((attrDecl == NULL) && (doc->extSubset != NULL))
            attrDecl = xmlGetDtdQAttrDesc(doc->extSubset, fullname,
                                ns->prefix, BAD_CAST "xmlns");
      } else {
          attrDecl = xmlGetDtdAttrDesc(doc->intSubset, fullname,
                                     BAD_CAST "xmlns");
          if ((attrDecl == NULL) && (doc->extSubset != NULL))
            attrDecl = xmlGetDtdAttrDesc(doc->extSubset, fullname,
                                   BAD_CAST "xmlns");
      }
      if ((fullname != fn) && (fullname != elem->name))
          xmlFree(fullname);
    }
    if (attrDecl == NULL) {
      if (ns->prefix != NULL) {
          attrDecl = xmlGetDtdQAttrDesc(doc->intSubset, elem->name,
                                      ns->prefix, BAD_CAST "xmlns");
          if ((attrDecl == NULL) && (doc->extSubset != NULL))
            attrDecl = xmlGetDtdQAttrDesc(doc->extSubset, elem->name,
                                    ns->prefix, BAD_CAST "xmlns");
      } else {
          attrDecl = xmlGetDtdAttrDesc(doc->intSubset,
                                     elem->name, BAD_CAST "xmlns");
          if ((attrDecl == NULL) && (doc->extSubset != NULL))
            attrDecl = xmlGetDtdAttrDesc(doc->extSubset,
                                   elem->name, BAD_CAST "xmlns");
      }
    }


    /* Validity Constraint: Attribute Value Type */
    if (attrDecl == NULL) {
      if (ns->prefix != NULL) {
          xmlErrValidNode(ctxt, elem, XML_DTD_UNKNOWN_ATTRIBUTE,
               "No declaration for attribute xmlns:%s of element %s\n",
               ns->prefix, elem->name, NULL);
      } else {
          xmlErrValidNode(ctxt, elem, XML_DTD_UNKNOWN_ATTRIBUTE,
               "No declaration for attribute xmlns of element %s\n",
               elem->name, NULL, NULL);
      }
      return(0);
    }

    val = xmlValidateAttributeValue(attrDecl->atype, value);
    if (val == 0) {
      if (ns->prefix != NULL) {
          xmlErrValidNode(ctxt, elem, XML_DTD_INVALID_DEFAULT,
             "Syntax of value for attribute xmlns:%s of %s is not valid\n",
               ns->prefix, elem->name, NULL);
      } else {
          xmlErrValidNode(ctxt, elem, XML_DTD_INVALID_DEFAULT,
             "Syntax of value for attribute xmlns of %s is not valid\n",
               elem->name, NULL, NULL);
      }
        ret = 0;
    }

    /* Validity constraint: Fixed Attribute Default */
    if (attrDecl->def == XML_ATTRIBUTE_FIXED) {
      if (!xmlStrEqual(value, attrDecl->defaultValue)) {
          if (ns->prefix != NULL) {
            xmlErrValidNode(ctxt, elem, XML_DTD_ATTRIBUTE_DEFAULT,
       "Value for attribute xmlns:%s of %s is different from default \"%s\"\n",
                   ns->prefix, elem->name, attrDecl->defaultValue);
          } else {
            xmlErrValidNode(ctxt, elem, XML_DTD_ATTRIBUTE_DEFAULT,
       "Value for attribute xmlns of %s is different from default \"%s\"\n",
                   elem->name, attrDecl->defaultValue, NULL);
          }
          ret = 0;
      }
    }

    /* Validity Constraint: ID uniqueness */
    if (attrDecl->atype == XML_ATTRIBUTE_ID) {
        if (xmlAddID(ctxt, doc, value, (xmlAttrPtr) ns) == NULL)
          ret = 0;
    }

    if ((attrDecl->atype == XML_ATTRIBUTE_IDREF) ||
      (attrDecl->atype == XML_ATTRIBUTE_IDREFS)) {
        if (xmlAddRef(ctxt, doc, value, (xmlAttrPtr) ns) == NULL)
          ret = 0;
    }

    /* Validity Constraint: Notation Attributes */
    if (attrDecl->atype == XML_ATTRIBUTE_NOTATION) {
        xmlEnumerationPtr tree = attrDecl->tree;
        xmlNotationPtr nota;

        /* First check that the given NOTATION was declared */
      nota = xmlGetDtdNotationDesc(doc->intSubset, value);
      if (nota == NULL)
          nota = xmlGetDtdNotationDesc(doc->extSubset, value);
      
      if (nota == NULL) {
          if (ns->prefix != NULL) {
            xmlErrValidNode(ctxt, elem, XML_DTD_UNKNOWN_NOTATION,
       "Value \"%s\" for attribute xmlns:%s of %s is not a declared Notation\n",
                   value, ns->prefix, elem->name);
          } else {
            xmlErrValidNode(ctxt, elem, XML_DTD_UNKNOWN_NOTATION,
       "Value \"%s\" for attribute xmlns of %s is not a declared Notation\n",
                   value, elem->name, NULL);
          }
          ret = 0;
        }

      /* Second, verify that it's among the list */
      while (tree != NULL) {
          if (xmlStrEqual(tree->name, value)) break;
          tree = tree->next;
      }
      if (tree == NULL) {
          if (ns->prefix != NULL) {
            xmlErrValidNode(ctxt, elem, XML_DTD_NOTATION_VALUE,
"Value \"%s\" for attribute xmlns:%s of %s is not among the enumerated notations\n",
                   value, ns->prefix, elem->name);
          } else {
            xmlErrValidNode(ctxt, elem, XML_DTD_NOTATION_VALUE,
"Value \"%s\" for attribute xmlns of %s is not among the enumerated notations\n",
                   value, elem->name, NULL);
          }
          ret = 0;
      }
    }

    /* Validity Constraint: Enumeration */
    if (attrDecl->atype == XML_ATTRIBUTE_ENUMERATION) {
        xmlEnumerationPtr tree = attrDecl->tree;
      while (tree != NULL) {
          if (xmlStrEqual(tree->name, value)) break;
          tree = tree->next;
      }
      if (tree == NULL) {
          if (ns->prefix != NULL) {
            xmlErrValidNode(ctxt, elem, XML_DTD_ATTRIBUTE_VALUE,
"Value \"%s\" for attribute xmlns:%s of %s is not among the enumerated set\n",
                   value, ns->prefix, elem->name);
          } else {
            xmlErrValidNode(ctxt, elem, XML_DTD_ATTRIBUTE_VALUE,
"Value \"%s\" for attribute xmlns of %s is not among the enumerated set\n",
                   value, elem->name, NULL);
          }
          ret = 0;
      }
    }

    /* Fixed Attribute Default */
    if ((attrDecl->def == XML_ATTRIBUTE_FIXED) &&
        (!xmlStrEqual(attrDecl->defaultValue, value))) {
      if (ns->prefix != NULL) {
          xmlErrValidNode(ctxt, elem, XML_DTD_ELEM_NAMESPACE,
               "Value for attribute xmlns:%s of %s must be \"%s\"\n",
               ns->prefix, elem->name, attrDecl->defaultValue);
      } else {
          xmlErrValidNode(ctxt, elem, XML_DTD_ELEM_NAMESPACE,
               "Value for attribute xmlns of %s must be \"%s\"\n",
               elem->name, attrDecl->defaultValue, NULL);
      }
        ret = 0;
    }

    /* Extra check for the attribute value */
    if (ns->prefix != NULL) {
      ret &= xmlValidateAttributeValue2(ctxt, doc, ns->prefix,
                                attrDecl->atype, value);
    } else {
      ret &= xmlValidateAttributeValue2(ctxt, doc, BAD_CAST "xmlns",
                                attrDecl->atype, value);
    }

    return(ret);
}

#ifndef  LIBXML_REGEXP_ENABLED
/**
 * xmlValidateSkipIgnorable:
 * @ctxt:  the validation context
 * @child:  the child list
 *
 * Skip ignorable elements w.r.t. the validation process
 *
 * returns the first element to consider for validation of the content model
 */

static xmlNodePtr
xmlValidateSkipIgnorable(xmlNodePtr child) {
    while (child != NULL) {
      switch (child->type) {
          /* These things are ignored (skipped) during validation.  */
          case XML_PI_NODE:
          case XML_COMMENT_NODE:
          case XML_XINCLUDE_START:
          case XML_XINCLUDE_END:
            child = child->next;
            break;
          case XML_TEXT_NODE:
            if (xmlIsBlankNode(child))
                child = child->next;
            else
                return(child);
            break;
          /* keep current node */
          default:
            return(child);
      }
    }
    return(child);
}

/**
 * xmlValidateElementType:
 * @ctxt:  the validation context
 *
 * Try to validate the content model of an element internal function
 *
 * returns 1 if valid or 0 ,-1 in case of error, -2 if an entity
 *           reference is found and -3 if the validation succeeded but
 *           the content model is not determinist.
 */

static int
xmlValidateElementType(xmlValidCtxtPtr ctxt) {
    int ret = -1;
    int determinist = 1;

    NODE = xmlValidateSkipIgnorable(NODE);
    if ((NODE == NULL) && (CONT == NULL))
      return(1);
    if ((NODE == NULL) && 
      ((CONT->ocur == XML_ELEMENT_CONTENT_MULT) ||
       (CONT->ocur == XML_ELEMENT_CONTENT_OPT))) {
      return(1);
    }
    if (CONT == NULL) return(-1);
    if ((NODE != NULL) && (NODE->type == XML_ENTITY_REF_NODE))
      return(-2);

    /*
     * We arrive here when more states need to be examined
     */
cont:

    /*
     * We just recovered from a rollback generated by a possible
     * epsilon transition, go directly to the analysis phase
     */
    if (STATE == ROLLBACK_PARENT) {
      DEBUG_VALID_MSG("restored parent branch");
      DEBUG_VALID_STATE(NODE, CONT)
      ret = 1;
      goto analyze;
    }

    DEBUG_VALID_STATE(NODE, CONT)
    /*
     * we may have to save a backup state here. This is the equivalent
     * of handling epsilon transition in NFAs.
     */
    if ((CONT != NULL) &&
      ((CONT->parent == NULL) ||
       (CONT->parent->type != XML_ELEMENT_CONTENT_OR)) &&
      ((CONT->ocur == XML_ELEMENT_CONTENT_MULT) ||
       (CONT->ocur == XML_ELEMENT_CONTENT_OPT) ||
       ((CONT->ocur == XML_ELEMENT_CONTENT_PLUS) && (OCCURRENCE)))) {
      DEBUG_VALID_MSG("saving parent branch");
      if (vstateVPush(ctxt, CONT, NODE, DEPTH, OCCURS, ROLLBACK_PARENT) < 0)
          return(0);
    }


    /*
     * Check first if the content matches
     */
    switch (CONT->type) {
      case XML_ELEMENT_CONTENT_PCDATA:
          if (NODE == NULL) {
            DEBUG_VALID_MSG("pcdata failed no node");
            ret = 0;
            break;
          }
          if (NODE->type == XML_TEXT_NODE) {
            DEBUG_VALID_MSG("pcdata found, skip to next");
            /*
             * go to next element in the content model
             * skipping ignorable elems
             */
            do {
                NODE = NODE->next;
                NODE = xmlValidateSkipIgnorable(NODE);
                if ((NODE != NULL) &&
                  (NODE->type == XML_ENTITY_REF_NODE))
                  return(-2);
            } while ((NODE != NULL) &&
                   ((NODE->type != XML_ELEMENT_NODE) &&
                    (NODE->type != XML_TEXT_NODE) &&
                    (NODE->type != XML_CDATA_SECTION_NODE)));
                ret = 1;
            break;
          } else {
            DEBUG_VALID_MSG("pcdata failed");
            ret = 0;
            break;
          }
          break;
      case XML_ELEMENT_CONTENT_ELEMENT:
          if (NODE == NULL) {
            DEBUG_VALID_MSG("element failed no node");
            ret = 0;
            break;
          }
          ret = ((NODE->type == XML_ELEMENT_NODE) &&
               (xmlStrEqual(NODE->name, CONT->name)));
          if (ret == 1) {
            if ((NODE->ns == NULL) || (NODE->ns->prefix == NULL)) {
                ret = (CONT->prefix == NULL);
            } else if (CONT->prefix == NULL) {
                ret = 0;
            } else {
                ret = xmlStrEqual(NODE->ns->prefix, CONT->prefix);
            }
          }
          if (ret == 1) {
            DEBUG_VALID_MSG("element found, skip to next");
            /*
             * go to next element in the content model
             * skipping ignorable elems
             */
            do {
                NODE = NODE->next;
                NODE = xmlValidateSkipIgnorable(NODE);
                if ((NODE != NULL) &&
                  (NODE->type == XML_ENTITY_REF_NODE))
                  return(-2);
            } while ((NODE != NULL) &&
                   ((NODE->type != XML_ELEMENT_NODE) &&
                    (NODE->type != XML_TEXT_NODE) &&
                    (NODE->type != XML_CDATA_SECTION_NODE)));
          } else {
            DEBUG_VALID_MSG("element failed");
            ret = 0;
            break;
          }
          break;
      case XML_ELEMENT_CONTENT_OR:
          /*
           * Small optimization.
           */
          if (CONT->c1->type == XML_ELEMENT_CONTENT_ELEMENT) {
            if ((NODE == NULL) ||
                (!xmlStrEqual(NODE->name, CONT->c1->name))) {
                DEPTH++;
                CONT = CONT->c2;
                goto cont;
            }
            if ((NODE->ns == NULL) || (NODE->ns->prefix == NULL)) {
                ret = (CONT->c1->prefix == NULL);
            } else if (CONT->c1->prefix == NULL) {
                ret = 0;
            } else {
                ret = xmlStrEqual(NODE->ns->prefix, CONT->c1->prefix);
            }
            if (ret == 0) {
                DEPTH++;
                CONT = CONT->c2;
                goto cont;
            }
          }

          /*
           * save the second branch 'or' branch
           */
          DEBUG_VALID_MSG("saving 'or' branch");
          if (vstateVPush(ctxt, CONT->c2, NODE, (unsigned char)(DEPTH + 1),
                      OCCURS, ROLLBACK_OR) < 0)
            return(-1);
          DEPTH++;
          CONT = CONT->c1;
          goto cont;
      case XML_ELEMENT_CONTENT_SEQ:
          /*
           * Small optimization.
           */
          if ((CONT->c1->type == XML_ELEMENT_CONTENT_ELEMENT) &&
            ((CONT->c1->ocur == XML_ELEMENT_CONTENT_OPT) ||
             (CONT->c1->ocur == XML_ELEMENT_CONTENT_MULT))) {
            if ((NODE == NULL) ||
                (!xmlStrEqual(NODE->name, CONT->c1->name))) {
                DEPTH++;
                CONT = CONT->c2;
                goto cont;
            }
            if ((NODE->ns == NULL) || (NODE->ns->prefix == NULL)) {
                ret = (CONT->c1->prefix == NULL);
            } else if (CONT->c1->prefix == NULL) {
                ret = 0;
            } else {
                ret = xmlStrEqual(NODE->ns->prefix, CONT->c1->prefix);
            }
            if (ret == 0) {
                DEPTH++;
                CONT = CONT->c2;
                goto cont;
            }
          }
          DEPTH++;
          CONT = CONT->c1;
          goto cont;
    }

    /*
     * At this point handle going up in the tree
     */
    if (ret == -1) {
      DEBUG_VALID_MSG("error found returning");
      return(ret);
    }
analyze:
    while (CONT != NULL) {
      /*
       * First do the analysis depending on the occurrence model at
       * this level.
       */
      if (ret == 0) {
          switch (CONT->ocur) {
            xmlNodePtr cur;

            case XML_ELEMENT_CONTENT_ONCE:
                cur = ctxt->vstate->node;
                DEBUG_VALID_MSG("Once branch failed, rollback");
                if (vstateVPop(ctxt) < 0 ) {
                  DEBUG_VALID_MSG("exhaustion, failed");
                  return(0);
                }
                if (cur != ctxt->vstate->node)
                  determinist = -3;
                goto cont;
            case XML_ELEMENT_CONTENT_PLUS:
                if (OCCURRENCE == 0) {
                  cur = ctxt->vstate->node;
                  DEBUG_VALID_MSG("Plus branch failed, rollback");
                  if (vstateVPop(ctxt) < 0 ) {
                      DEBUG_VALID_MSG("exhaustion, failed");
                      return(0);
                  }
                  if (cur != ctxt->vstate->node)
                      determinist = -3;
                  goto cont;
                }
                DEBUG_VALID_MSG("Plus branch found");
                ret = 1;
                break;
            case XML_ELEMENT_CONTENT_MULT:
#ifdef DEBUG_VALID_ALGO
                if (OCCURRENCE == 0) {
                  DEBUG_VALID_MSG("Mult branch failed");
                } else {
                  DEBUG_VALID_MSG("Mult branch found");
                }
#endif
                ret = 1;
                break;
            case XML_ELEMENT_CONTENT_OPT:
                DEBUG_VALID_MSG("Option branch failed");
                ret = 1;
                break;
          }
      } else {
          switch (CONT->ocur) {
            case XML_ELEMENT_CONTENT_OPT:
                DEBUG_VALID_MSG("Option branch succeeded");
                ret = 1;
                break;
            case XML_ELEMENT_CONTENT_ONCE:
                DEBUG_VALID_MSG("Once branch succeeded");
                ret = 1;
                break;
            case XML_ELEMENT_CONTENT_PLUS:
                if (STATE == ROLLBACK_PARENT) {
                  DEBUG_VALID_MSG("Plus branch rollback");
                  ret = 1;
                  break;
                }
                if (NODE == NULL) {
                  DEBUG_VALID_MSG("Plus branch exhausted");
                  ret = 1;
                  break;
                }
                DEBUG_VALID_MSG("Plus branch succeeded, continuing");
                SET_OCCURRENCE;
                goto cont;
            case XML_ELEMENT_CONTENT_MULT:
                if (STATE == ROLLBACK_PARENT) {
                  DEBUG_VALID_MSG("Mult branch rollback");
                  ret = 1;
                  break;
                }
                if (NODE == NULL) {
                  DEBUG_VALID_MSG("Mult branch exhausted");
                  ret = 1;
                  break;
                }
                DEBUG_VALID_MSG("Mult branch succeeded, continuing");
                /* SET_OCCURRENCE; */
                goto cont;
          }
      }
      STATE = 0;

      /*
       * Then act accordingly at the parent level
       */
      RESET_OCCURRENCE;
      if (CONT->parent == NULL)
          break;

      switch (CONT->parent->type) {
          case XML_ELEMENT_CONTENT_PCDATA:
            DEBUG_VALID_MSG("Error: parent pcdata");
            return(-1);
          case XML_ELEMENT_CONTENT_ELEMENT:
            DEBUG_VALID_MSG("Error: parent element");
            return(-1);
          case XML_ELEMENT_CONTENT_OR:
            if (ret == 1) {
                DEBUG_VALID_MSG("Or succeeded");
                CONT = CONT->parent;
                DEPTH--;
            } else {
                DEBUG_VALID_MSG("Or failed");
                CONT = CONT->parent;
                DEPTH--;
            }
            break;
          case XML_ELEMENT_CONTENT_SEQ:
            if (ret == 0) {
                DEBUG_VALID_MSG("Sequence failed");
                CONT = CONT->parent;
                DEPTH--;
            } else if (CONT == CONT->parent->c1) {
                DEBUG_VALID_MSG("Sequence testing 2nd branch");
                CONT = CONT->parent->c2;
                goto cont;
            } else {
                DEBUG_VALID_MSG("Sequence succeeded");
                CONT = CONT->parent;
                DEPTH--;
            }
      }
    }
    if (NODE != NULL) {
      xmlNodePtr cur;

      cur = ctxt->vstate->node;
      DEBUG_VALID_MSG("Failed, remaining input, rollback");
      if (vstateVPop(ctxt) < 0 ) {
          DEBUG_VALID_MSG("exhaustion, failed");
          return(0);
      }
      if (cur != ctxt->vstate->node)
          determinist = -3;
      goto cont;
    }
    if (ret == 0) {
      xmlNodePtr cur;

      cur = ctxt->vstate->node;
      DEBUG_VALID_MSG("Failure, rollback");
      if (vstateVPop(ctxt) < 0 ) {
          DEBUG_VALID_MSG("exhaustion, failed");
          return(0);
      }
      if (cur != ctxt->vstate->node)
          determinist = -3;
      goto cont;
    }
    return(determinist);
}
#endif

/**
 * xmlSnprintfElements:
 * @buf:  an output buffer
 * @size:  the size of the buffer
 * @content:  An element
 * @glob: 1 if one must print the englobing parenthesis, 0 otherwise
 *
 * This will dump the list of elements to the buffer
 * Intended just for the debug routine
 */
static void
xmlSnprintfElements(char *buf, int size, xmlNodePtr node, int glob) {
    xmlNodePtr cur;
    int len;

    if (node == NULL) return;
    if (glob) strcat(buf, "(");
    cur = node;
    while (cur != NULL) {
      len = strlen(buf);
      if (size - len < 50) {
          if ((size - len > 4) && (buf[len - 1] != '.'))
            strcat(buf, " ...");
          return;
      }
        switch (cur->type) {
            case XML_ELEMENT_NODE:
            if ((cur->ns != NULL) && (cur->ns->prefix != NULL)) {
                if (size - len < xmlStrlen(cur->ns->prefix) + 10) {
                  if ((size - len > 4) && (buf[len - 1] != '.'))
                      strcat(buf, " ...");
                  return;
                }
                strcat(buf, (char *) cur->ns->prefix);
                strcat(buf, ":");
            }
                if (size - len < xmlStrlen(cur->name) + 10) {
                if ((size - len > 4) && (buf[len - 1] != '.'))
                  strcat(buf, " ...");
                return;
            }
              strcat(buf, (char *) cur->name);
            if (cur->next != NULL)
                strcat(buf, " ");
            break;
            case XML_TEXT_NODE:
            if (xmlIsBlankNode(cur))
                break;
            case XML_CDATA_SECTION_NODE:
            case XML_ENTITY_REF_NODE:
              strcat(buf, "CDATA");
            if (cur->next != NULL)
                strcat(buf, " ");
            break;
            case XML_ATTRIBUTE_NODE:
            case XML_DOCUMENT_NODE:
#ifdef LIBXML_DOCB_ENABLED
          case XML_DOCB_DOCUMENT_NODE:
#endif
          case XML_HTML_DOCUMENT_NODE:
            case XML_DOCUMENT_TYPE_NODE:
            case XML_DOCUMENT_FRAG_NODE:
            case XML_NOTATION_NODE:
          case XML_NAMESPACE_DECL:
              strcat(buf, "???");
            if (cur->next != NULL)
                strcat(buf, " ");
            break;
            case XML_ENTITY_NODE:
            case XML_PI_NODE:
            case XML_DTD_NODE:
            case XML_COMMENT_NODE:
          case XML_ELEMENT_DECL:
          case XML_ATTRIBUTE_DECL:
          case XML_ENTITY_DECL:
          case XML_XINCLUDE_START:
          case XML_XINCLUDE_END:
            break;
      }
      cur = cur->next;
    }
    if (glob) strcat(buf, ")");
}

/**
 * xmlValidateElementContent:
 * @ctxt:  the validation context
 * @child:  the child list
 * @elemDecl:  pointer to the element declaration
 * @warn:  emit the error message
 * @parent: the parent element (for error reporting)
 *
 * Try to validate the content model of an element
 *
 * returns 1 if valid or 0 if not and -1 in case of error
 */

static int
xmlValidateElementContent(xmlValidCtxtPtr ctxt, xmlNodePtr child,
       xmlElementPtr elemDecl, int warn, xmlNodePtr parent) {
    int ret = 1;
#ifndef  LIBXML_REGEXP_ENABLED
    xmlNodePtr repl = NULL, last = NULL, tmp;
#endif
    xmlNodePtr cur;
    xmlElementContentPtr cont;
    const xmlChar *name;

    if (elemDecl == NULL)
      return(-1);
    cont = elemDecl->content;
    name = elemDecl->name;

#ifdef LIBXML_REGEXP_ENABLED
    /* Build the regexp associated to the content model */
    if (elemDecl->contModel == NULL)
      ret = xmlValidBuildContentModel(ctxt, elemDecl);
    if (elemDecl->contModel == NULL) {
      return(-1);
    } else {
      xmlRegExecCtxtPtr exec;

      if (!xmlRegexpIsDeterminist(elemDecl->contModel)) {
          return(-1);
      }
      ctxt->nodeMax = 0;
      ctxt->nodeNr = 0;
      ctxt->nodeTab = NULL;
      exec = xmlRegNewExecCtxt(elemDecl->contModel, NULL, NULL);
      if (exec != NULL) {
          cur = child;
          while (cur != NULL) {
            switch (cur->type) {
                case XML_ENTITY_REF_NODE:
                  /*
                   * Push the current node to be able to roll back
                   * and process within the entity
                   */
                  if ((cur->children != NULL) &&
                      (cur->children->children != NULL)) {
                      nodeVPush(ctxt, cur);
                      cur = cur->children->children;
                      continue;
                  }
                  break;
                case XML_TEXT_NODE:
                  if (xmlIsBlankNode(cur))
                      break;
                  ret = 0;
                  goto fail;
                case XML_CDATA_SECTION_NODE:
                  /* TODO */
                  ret = 0;
                  goto fail;
                case XML_ELEMENT_NODE:
                  if ((cur->ns != NULL) && (cur->ns->prefix != NULL)) {
                      xmlChar fn[50];
                      xmlChar *fullname;
                      
                      fullname = xmlBuildQName(cur->name,
                                             cur->ns->prefix, fn, 50);
                      if (fullname == NULL) {
                        ret = -1;
                        goto fail;
                      }
                            ret = xmlRegExecPushString(exec, fullname, NULL);
                      if ((fullname != fn) && (fullname != cur->name))
                        xmlFree(fullname);
                  } else {
                      ret = xmlRegExecPushString(exec, cur->name, NULL);
                  }
                  break;
                default:
                  break;
            }
            /*
             * Switch to next element
             */
            cur = cur->next;
            while (cur == NULL) {
                cur = nodeVPop(ctxt);
                if (cur == NULL)
                  break;
                cur = cur->next;
            }
          }
          ret = xmlRegExecPushString(exec, NULL, NULL);
fail:
          xmlRegFreeExecCtxt(exec);
      }
    }
#else  /* LIBXML_REGEXP_ENABLED */
    /*
     * Allocate the stack
     */
    ctxt->vstateMax = 8;
    ctxt->vstateTab = (xmlValidState *) xmlMalloc(
             ctxt->vstateMax * sizeof(ctxt->vstateTab[0]));
    if (ctxt->vstateTab == NULL) {
      xmlVErrMemory(ctxt, "malloc failed");
      return(-1);
    }
    /*
     * The first entry in the stack is reserved to the current state
     */
    ctxt->nodeMax = 0;
    ctxt->nodeNr = 0;
    ctxt->nodeTab = NULL;
    ctxt->vstate = &ctxt->vstateTab[0];
    ctxt->vstateNr = 1;
    CONT = cont;
    NODE = child;
    DEPTH = 0;
    OCCURS = 0;
    STATE = 0;
    ret = xmlValidateElementType(ctxt);
    if ((ret == -3) && (warn)) {
      xmlErrValidWarning(ctxt, child, XML_DTD_CONTENT_NOT_DETERMINIST,
             "Content model for Element %s is ambiguous\n",
                         name, NULL, NULL);
    } else if (ret == -2) {
      /*
       * An entities reference appeared at this level.
       * Buid a minimal representation of this node content
       * sufficient to run the validation process on it
       */
      DEBUG_VALID_MSG("Found an entity reference, linearizing");
      cur = child;
      while (cur != NULL) {
          switch (cur->type) {
            case XML_ENTITY_REF_NODE:
                /*
                 * Push the current node to be able to roll back
                 * and process within the entity
                 */
                if ((cur->children != NULL) &&
                  (cur->children->children != NULL)) {
                  nodeVPush(ctxt, cur);
                  cur = cur->children->children;
                  continue;
                }
                break;
            case XML_TEXT_NODE:
                if (xmlIsBlankNode(cur))
                  break;
                /* no break on purpose */
            case XML_CDATA_SECTION_NODE:
                /* no break on purpose */
            case XML_ELEMENT_NODE:
                /*
                 * Allocate a new node and minimally fills in
                 * what's required
                 */
                tmp = (xmlNodePtr) xmlMalloc(sizeof(xmlNode));
                if (tmp == NULL) {
                  xmlVErrMemory(ctxt, "malloc failed");
                  xmlFreeNodeList(repl);
                  ret = -1;
                  goto done;
                }
                tmp->type = cur->type;
                tmp->name = cur->name;
                tmp->ns = cur->ns;
                tmp->next = NULL;
                tmp->content = NULL;
                if (repl == NULL)
                  repl = last = tmp;
                else {
                  last->next = tmp;
                  last = tmp;
                }
                if (cur->type == XML_CDATA_SECTION_NODE) {
                  /* 
                   * E59 spaces in CDATA does not match the
                   * nonterminal S
                   */
                  tmp->content = xmlStrdup(BAD_CAST "CDATA");
                }
                break;
            default:
                break;
          }
          /*
           * Switch to next element
           */
          cur = cur->next;
          while (cur == NULL) {
            cur = nodeVPop(ctxt);
            if (cur == NULL)
                break;
            cur = cur->next;
          }
      }

      /*
       * Relaunch the validation
       */
      ctxt->vstate = &ctxt->vstateTab[0];
      ctxt->vstateNr = 1;
      CONT = cont;
      NODE = repl;
      DEPTH = 0;
      OCCURS = 0;
      STATE = 0;
      ret = xmlValidateElementType(ctxt);
    }
#endif /* LIBXML_REGEXP_ENABLED */
    if ((warn) && ((ret != 1) && (ret != -3))) {
      if (ctxt != NULL) {
          char expr[5000];
          char list[5000];

          expr[0] = 0;
          xmlSnprintfElementContent(&expr[0], 5000, cont, 1);
          list[0] = 0;
#ifndef LIBXML_REGEXP_ENABLED
          if (repl != NULL)
            xmlSnprintfElements(&list[0], 5000, repl, 1);
          else
#endif /* LIBXML_REGEXP_ENABLED */
            xmlSnprintfElements(&list[0], 5000, child, 1);

          if (name != NULL) {
            xmlErrValidNode(ctxt, parent, XML_DTD_CONTENT_MODEL,
         "Element %s content does not follow the DTD, expecting %s, got %s\n",
                   name, BAD_CAST expr, BAD_CAST list);
          } else {
            xmlErrValidNode(ctxt, parent, XML_DTD_CONTENT_MODEL,
         "Element content does not follow the DTD, expecting %s, got %s\n",
                   BAD_CAST expr, BAD_CAST list, NULL);
          }
      } else {
          if (name != NULL) {
            xmlErrValidNode(ctxt, parent, XML_DTD_CONTENT_MODEL,
                   "Element %s content does not follow the DTD\n",
                   name, NULL, NULL);
          } else {
            xmlErrValidNode(ctxt, parent, XML_DTD_CONTENT_MODEL,
                   "Element content does not follow the DTD\n",
                            NULL, NULL, NULL);
          }
      }
      ret = 0;
    }
    if (ret == -3)
      ret = 1;

#ifndef  LIBXML_REGEXP_ENABLED
done:
    /*
     * Deallocate the copy if done, and free up the validation stack
     */
    while (repl != NULL) {
      tmp = repl->next;
      xmlFree(repl);
      repl = tmp;
    }
    ctxt->vstateMax = 0;
    if (ctxt->vstateTab != NULL) {
      xmlFree(ctxt->vstateTab);
      ctxt->vstateTab = NULL;
    }
#endif
    ctxt->nodeMax = 0;
    ctxt->nodeNr = 0;
    if (ctxt->nodeTab != NULL) {
      xmlFree(ctxt->nodeTab);
      ctxt->nodeTab = NULL;
    }
    return(ret);

}

/**
 * xmlValidateCdataElement:
 * @ctxt:  the validation context
 * @doc:  a document instance
 * @elem:  an element instance
 *
 * Check that an element follows #CDATA
 *
 * returns 1 if valid or 0 otherwise
 */
static int
xmlValidateOneCdataElement(xmlValidCtxtPtr ctxt, xmlDocPtr doc,
                           xmlNodePtr elem) {
    int ret = 1;
    xmlNodePtr cur, child;

    if ((ctxt == NULL) || (doc == NULL) || (elem == NULL))
      return(0);

    child = elem->children;

    cur = child;
    while (cur != NULL) {
      switch (cur->type) {
          case XML_ENTITY_REF_NODE:
            /*
             * Push the current node to be able to roll back
             * and process within the entity
             */
            if ((cur->children != NULL) &&
                (cur->children->children != NULL)) {
                nodeVPush(ctxt, cur);
                cur = cur->children->children;
                continue;
            }
            break;
          case XML_COMMENT_NODE:
          case XML_PI_NODE:
          case XML_TEXT_NODE:
          case XML_CDATA_SECTION_NODE:
            break;
          default:
            ret = 0;
            goto done;
      }
      /*
       * Switch to next element
       */
      cur = cur->next;
      while (cur == NULL) {
          cur = nodeVPop(ctxt);
          if (cur == NULL)
            break;
          cur = cur->next;
      }
    }
done:
    ctxt->nodeMax = 0;
    ctxt->nodeNr = 0;
    if (ctxt->nodeTab != NULL) {
      xmlFree(ctxt->nodeTab);
      ctxt->nodeTab = NULL;
    }
    return(ret);
}

/**
 * xmlValidateCheckMixed:
 * @ctxt:  the validation context
 * @cont:  the mixed content model
 * @qname:  the qualified name as appearing in the serialization
 *
 * Check if the given node is part of the content model.
 *
 * Returns 1 if yes, 0 if no, -1 in case of error
 */
static int
xmlValidateCheckMixed(xmlValidCtxtPtr ctxt,
                    xmlElementContentPtr cont, const xmlChar *qname) {
    const xmlChar *name;
    int plen;
    name = xmlSplitQName3(qname, &plen);

    if (name == NULL) {
      while (cont != NULL) {
          if (cont->type == XML_ELEMENT_CONTENT_ELEMENT) {
            if ((cont->prefix == NULL) && (xmlStrEqual(cont->name, qname)))
                return(1);
          } else if ((cont->type == XML_ELEMENT_CONTENT_OR) &&
             (cont->c1 != NULL) &&
             (cont->c1->type == XML_ELEMENT_CONTENT_ELEMENT)){
            if ((cont->c1->prefix == NULL) &&
                (xmlStrEqual(cont->c1->name, qname)))
                return(1);
          } else if ((cont->type != XML_ELEMENT_CONTENT_OR) ||
            (cont->c1 == NULL) ||
            (cont->c1->type != XML_ELEMENT_CONTENT_PCDATA)){
            xmlErrValid(NULL, XML_DTD_MIXED_CORRUPT, 
                  "Internal: MIXED struct corrupted\n",
                  NULL);
            break;
          }
          cont = cont->c2;
      }
    } else {
      while (cont != NULL) {
          if (cont->type == XML_ELEMENT_CONTENT_ELEMENT) {
            if ((cont->prefix != NULL) &&
                (xmlStrncmp(cont->prefix, qname, plen) == 0) &&
                (xmlStrEqual(cont->name, name)))
                return(1);
          } else if ((cont->type == XML_ELEMENT_CONTENT_OR) &&
             (cont->c1 != NULL) &&
             (cont->c1->type == XML_ELEMENT_CONTENT_ELEMENT)){
            if ((cont->c1->prefix != NULL) &&
                (xmlStrncmp(cont->c1->prefix, qname, plen) == 0) &&
                (xmlStrEqual(cont->c1->name, name)))
                return(1);
          } else if ((cont->type != XML_ELEMENT_CONTENT_OR) ||
            (cont->c1 == NULL) ||
            (cont->c1->type != XML_ELEMENT_CONTENT_PCDATA)){
            xmlErrValid(ctxt, XML_DTD_MIXED_CORRUPT, 
                  "Internal: MIXED struct corrupted\n",
                  NULL);
            break;
          }
          cont = cont->c2;
      }
    }
    return(0);
}

/**
 * xmlValidGetElemDecl:
 * @ctxt:  the validation context
 * @doc:  a document instance
 * @elem:  an element instance
 * @extsubset:  pointer, (out) indicate if the declaration was found
 *              in the external subset.
 *
 * Finds a declaration associated to an element in the document.
 *
 * returns the pointer to the declaration or NULL if not found.
 */
static xmlElementPtr
xmlValidGetElemDecl(xmlValidCtxtPtr ctxt, xmlDocPtr doc,
                  xmlNodePtr elem, int *extsubset) {
    xmlElementPtr elemDecl = NULL;
    const xmlChar *prefix = NULL;

    if ((ctxt == NULL) || (doc == NULL) || 
        (elem == NULL) || (elem->name == NULL))
        return(NULL);
    if (extsubset != NULL)
      *extsubset = 0;

    /*
     * Fetch the declaration for the qualified name
     */
    if ((elem->ns != NULL) && (elem->ns->prefix != NULL))
      prefix = elem->ns->prefix;

    if (prefix != NULL) {
      elemDecl = xmlGetDtdQElementDesc(doc->intSubset,
                                     elem->name, prefix);
      if ((elemDecl == NULL) && (doc->extSubset != NULL)) {
          elemDecl = xmlGetDtdQElementDesc(doc->extSubset,
                                         elem->name, prefix);
          if ((elemDecl != NULL) && (extsubset != NULL))
            *extsubset = 1;
      }
    }

    /*
     * Fetch the declaration for the non qualified name
     * This is "non-strict" validation should be done on the
     * full QName but in that case being flexible makes sense.
     */
    if (elemDecl == NULL) {
      elemDecl = xmlGetDtdElementDesc(doc->intSubset, elem->name);
      if ((elemDecl == NULL) && (doc->extSubset != NULL)) {
          elemDecl = xmlGetDtdElementDesc(doc->extSubset, elem->name);
          if ((elemDecl != NULL) && (extsubset != NULL))
            *extsubset = 1;
      }
    }
    if (elemDecl == NULL) {
      xmlErrValidNode(ctxt, elem,
                  XML_DTD_UNKNOWN_ELEM,
             "No declaration for element %s\n",
             elem->name, NULL, NULL);
    }
    return(elemDecl);
}

#ifdef LIBXML_REGEXP_ENABLED
/**
 * xmlValidatePushElement:
 * @ctxt:  the validation context
 * @doc:  a document instance
 * @elem:  an element instance
 * @qname:  the qualified name as appearing in the serialization
 *
 * Push a new element start on the validation stack.
 *
 * returns 1 if no validation problem was found or 0 otherwise
 */
int
xmlValidatePushElement(xmlValidCtxtPtr ctxt, xmlDocPtr doc,
                       xmlNodePtr elem, const xmlChar *qname) {
    int ret = 1;
    xmlElementPtr eDecl;
    int extsubset = 0;

    if (ctxt == NULL)
        return(0);
/* printf("PushElem %s\n", qname); */
    if ((ctxt->vstateNr > 0) && (ctxt->vstate != NULL)) {
      xmlValidStatePtr state = ctxt->vstate;
      xmlElementPtr elemDecl;

      /*
       * Check the new element agaisnt the content model of the new elem.
       */
      if (state->elemDecl != NULL) {
          elemDecl = state->elemDecl;

          switch(elemDecl->etype) {
            case XML_ELEMENT_TYPE_UNDEFINED:
                ret = 0;
                break;
            case XML_ELEMENT_TYPE_EMPTY:
                xmlErrValidNode(ctxt, state->node,
                            XML_DTD_NOT_EMPTY,
             "Element %s was declared EMPTY this one has content\n",
                     state->node->name, NULL, NULL);
                ret = 0;
                break;
            case XML_ELEMENT_TYPE_ANY:
                /* I don't think anything is required then */
                break;
            case XML_ELEMENT_TYPE_MIXED:
                /* simple case of declared as #PCDATA */
                if ((elemDecl->content != NULL) &&
                  (elemDecl->content->type ==
                   XML_ELEMENT_CONTENT_PCDATA)) {
                  xmlErrValidNode(ctxt, state->node,
                              XML_DTD_NOT_PCDATA,
             "Element %s was declared #PCDATA but contains non text nodes\n",
                        state->node->name, NULL, NULL);
                  ret = 0;
                } else {
                  ret = xmlValidateCheckMixed(ctxt, elemDecl->content,
                                            qname);
                  if (ret != 1) {
                      xmlErrValidNode(ctxt, state->node,
                                  XML_DTD_INVALID_CHILD,
             "Element %s is not declared in %s list of possible children\n",
                            qname, state->node->name, NULL);
                  }
                }
                break;
            case XML_ELEMENT_TYPE_ELEMENT:
                /*
                 * TODO:
                 * VC: Standalone Document Declaration
                 *     - element types with element content, if white space
                 *       occurs directly within any instance of those types.
                 */
                if (state->exec != NULL) {
                  ret = xmlRegExecPushString(state->exec, qname, NULL);
                  if (ret < 0) {
                      xmlErrValidNode(ctxt, state->node,
                                  XML_DTD_CONTENT_MODEL,
             "Element %s content does not follow the DTD, Misplaced %s\n",
                           state->node->name, qname, NULL);
                      ret = 0;
                  } else {
                      ret = 1;
                  }
                }
                break;
          }
      }
    }
    eDecl = xmlValidGetElemDecl(ctxt, doc, elem, &extsubset);
    vstateVPush(ctxt, eDecl, elem);
    return(ret);
}

/**
 * xmlValidatePushCData:
 * @ctxt:  the validation context
 * @data:  some character data read
 * @len:  the lenght of the data
 *
 * check the CData parsed for validation in the current stack
 *
 * returns 1 if no validation problem was found or 0 otherwise
 */
int
xmlValidatePushCData(xmlValidCtxtPtr ctxt, const xmlChar *data, int len) {
    int ret = 1;

/* printf("CDATA %s %d\n", data, len); */
    if (ctxt == NULL)
        return(0);
    if (len <= 0)
      return(ret);
    if ((ctxt->vstateNr > 0) && (ctxt->vstate != NULL)) {
      xmlValidStatePtr state = ctxt->vstate;
      xmlElementPtr elemDecl;

      /*
       * Check the new element agaisnt the content model of the new elem.
       */
      if (state->elemDecl != NULL) {
          elemDecl = state->elemDecl;

          switch(elemDecl->etype) {
            case XML_ELEMENT_TYPE_UNDEFINED:
                ret = 0;
                break;
            case XML_ELEMENT_TYPE_EMPTY:
                xmlErrValidNode(ctxt, state->node,
                            XML_DTD_NOT_EMPTY,
             "Element %s was declared EMPTY this one has content\n",
                     state->node->name, NULL, NULL);
                ret = 0;
                break;
            case XML_ELEMENT_TYPE_ANY:
                break;
            case XML_ELEMENT_TYPE_MIXED:
                break;
            case XML_ELEMENT_TYPE_ELEMENT:
                if (len > 0) {
                  int i;

                  for (i = 0;i < len;i++) {
                      if (!IS_BLANK_CH(data[i])) {
                        xmlErrValidNode(ctxt, state->node,
                                    XML_DTD_CONTENT_MODEL,
         "Element %s content does not follow the DTD, Text not allowed\n",
                               state->node->name, NULL, NULL);
                        ret = 0;
                        goto done;
                      }
                  }
                  /*
                   * TODO:
                   * VC: Standalone Document Declaration
                   *  element types with element content, if white space
                   *  occurs directly within any instance of those types.
                   */
                }
                break;
          }
      }
    }
done:
    return(ret);
}

/**
 * xmlValidatePopElement:
 * @ctxt:  the validation context
 * @doc:  a document instance
 * @elem:  an element instance
 * @qname:  the qualified name as appearing in the serialization
 *
 * Pop the element end from the validation stack.
 *
 * returns 1 if no validation problem was found or 0 otherwise
 */
int
xmlValidatePopElement(xmlValidCtxtPtr ctxt, xmlDocPtr doc ATTRIBUTE_UNUSED,
                      xmlNodePtr elem ATTRIBUTE_UNUSED,
                  const xmlChar *qname ATTRIBUTE_UNUSED) {
    int ret = 1;

    if (ctxt == NULL)
        return(0);
/* printf("PopElem %s\n", qname); */
    if ((ctxt->vstateNr > 0) && (ctxt->vstate != NULL)) {
      xmlValidStatePtr state = ctxt->vstate;
      xmlElementPtr elemDecl;

      /*
       * Check the new element agaisnt the content model of the new elem.
       */
      if (state->elemDecl != NULL) {
          elemDecl = state->elemDecl;

          if (elemDecl->etype == XML_ELEMENT_TYPE_ELEMENT) {
            if (state->exec != NULL) {
                ret = xmlRegExecPushString(state->exec, NULL, NULL);
                if (ret == 0) {
                  xmlErrValidNode(ctxt, state->node,
                                  XML_DTD_CONTENT_MODEL,
         "Element %s content does not follow the DTD, Expecting more child\n",
                         state->node->name, NULL,NULL);
                } else {
                  /*
                   * previous validation errors should not generate
                   * a new one here
                   */
                  ret = 1;
                }
            }
          }
      }
      vstateVPop(ctxt);
    }
    return(ret);
}
#endif /* LIBXML_REGEXP_ENABLED */

/**
 * xmlValidateOneElement:
 * @ctxt:  the validation context
 * @doc:  a document instance
 * @elem:  an element instance
 *
 * Try to validate a single element and it's attributes,
 * basically it does the following checks as described by the
 * XML-1.0 recommendation:
 *  - [ VC: Element Valid ]
 *  - [ VC: Required Attribute ]
 * Then call xmlValidateOneAttribute() for each attribute present.
 *
 * The ID/IDREF checkings are done separately
 *
 * returns 1 if valid or 0 otherwise
 */

int
xmlValidateOneElement(xmlValidCtxtPtr ctxt, xmlDocPtr doc,
                      xmlNodePtr elem) {
    xmlElementPtr elemDecl = NULL;
    xmlElementContentPtr cont;
    xmlAttributePtr attr;
    xmlNodePtr child;
    int ret = 1, tmp;
    const xmlChar *name;
    int extsubset = 0;

    CHECK_DTD;

    if (elem == NULL) return(0);
    switch (elem->type) {
        case XML_ATTRIBUTE_NODE:
          xmlErrValidNode(ctxt, elem, XML_ERR_INTERNAL_ERROR,
               "Attribute element not expected\n", NULL, NULL ,NULL);
          return(0);
        case XML_TEXT_NODE:
          if (elem->children != NULL) {
            xmlErrValidNode(ctxt, elem, XML_ERR_INTERNAL_ERROR,
                            "Text element has children !\n",
                        NULL,NULL,NULL);
            return(0);
          }
          if (elem->ns != NULL) {
            xmlErrValidNode(ctxt, elem, XML_ERR_INTERNAL_ERROR,
                            "Text element has namespace !\n",
                        NULL,NULL,NULL);
            return(0);
          }
          if (elem->content == NULL) {
            xmlErrValidNode(ctxt, elem, XML_ERR_INTERNAL_ERROR,
                            "Text element has no content !\n",
                        NULL,NULL,NULL);
            return(0);
          }
          return(1);
        case XML_XINCLUDE_START:
        case XML_XINCLUDE_END:
            return(1);
        case XML_CDATA_SECTION_NODE:
        case XML_ENTITY_REF_NODE:
        case XML_PI_NODE:
        case XML_COMMENT_NODE:
          return(1);
        case XML_ENTITY_NODE:
          xmlErrValidNode(ctxt, elem, XML_ERR_INTERNAL_ERROR,
               "Entity element not expected\n", NULL, NULL ,NULL);
          return(0);
        case XML_NOTATION_NODE:
          xmlErrValidNode(ctxt, elem, XML_ERR_INTERNAL_ERROR,
               "Notation element not expected\n", NULL, NULL ,NULL);
          return(0);
        case XML_DOCUMENT_NODE:
        case XML_DOCUMENT_TYPE_NODE:
        case XML_DOCUMENT_FRAG_NODE:
          xmlErrValidNode(ctxt, elem, XML_ERR_INTERNAL_ERROR,
               "Document element not expected\n", NULL, NULL ,NULL);
          return(0);
        case XML_HTML_DOCUMENT_NODE:
          xmlErrValidNode(ctxt, elem, XML_ERR_INTERNAL_ERROR,
               "HTML Document not expected\n", NULL, NULL ,NULL);
          return(0);
        case XML_ELEMENT_NODE:
          break;
      default:
          xmlErrValidNode(ctxt, elem, XML_ERR_INTERNAL_ERROR,
               "unknown element type\n", NULL, NULL ,NULL);
          return(0);
    }

    /*
     * Fetch the declaration
     */
    elemDecl = xmlValidGetElemDecl(ctxt, doc, elem, &extsubset);
    if (elemDecl == NULL)
      return(0);

    /*
     * If vstateNr is not zero that means continuous validation is 
     * activated, do not try to check the content model at that level.
     */
    if (ctxt->vstateNr == 0) {
    /* Check that the element content matches the definition */
    switch (elemDecl->etype) {
        case XML_ELEMENT_TYPE_UNDEFINED:
          xmlErrValidNode(ctxt, elem, XML_DTD_UNKNOWN_ELEM,
                          "No declaration for element %s\n",
               elem->name, NULL, NULL);
          return(0);
        case XML_ELEMENT_TYPE_EMPTY:
          if (elem->children != NULL) {
            xmlErrValidNode(ctxt, elem, XML_DTD_NOT_EMPTY,
             "Element %s was declared EMPTY this one has content\n",
                     elem->name, NULL, NULL);
            ret = 0;
          }
          break;
        case XML_ELEMENT_TYPE_ANY:
          /* I don't think anything is required then */
          break;
        case XML_ELEMENT_TYPE_MIXED:

          /* simple case of declared as #PCDATA */
          if ((elemDecl->content != NULL) &&
            (elemDecl->content->type == XML_ELEMENT_CONTENT_PCDATA)) {
            ret = xmlValidateOneCdataElement(ctxt, doc, elem);
            if (!ret) {
                xmlErrValidNode(ctxt, elem, XML_DTD_NOT_PCDATA,
             "Element %s was declared #PCDATA but contains non text nodes\n",
                     elem->name, NULL, NULL);
            }
            break;
          }
          child = elem->children;
          /* Hum, this start to get messy */
          while (child != NULL) {
              if (child->type == XML_ELEMENT_NODE) {
                name = child->name;
                if ((child->ns != NULL) && (child->ns->prefix != NULL)) {
                  xmlChar fn[50];
                  xmlChar *fullname;
                  
                  fullname = xmlBuildQName(child->name, child->ns->prefix,
                                         fn, 50);
                  if (fullname == NULL)
                      return(0);
                  cont = elemDecl->content;
                  while (cont != NULL) {
                      if (cont->type == XML_ELEMENT_CONTENT_ELEMENT) {
                        if (xmlStrEqual(cont->name, fullname))
                            break;
                      } else if ((cont->type == XML_ELEMENT_CONTENT_OR) &&
                         (cont->c1 != NULL) &&
                         (cont->c1->type == XML_ELEMENT_CONTENT_ELEMENT)){
                        if (xmlStrEqual(cont->c1->name, fullname))
                            break;
                      } else if ((cont->type != XML_ELEMENT_CONTENT_OR) ||
                        (cont->c1 == NULL) ||
                        (cont->c1->type != XML_ELEMENT_CONTENT_PCDATA)){
                        xmlErrValid(NULL, XML_DTD_MIXED_CORRUPT, 
                              "Internal: MIXED struct corrupted\n",
                              NULL);
                        break;
                      }
                      cont = cont->c2;
                  }
                  if ((fullname != fn) && (fullname != child->name))
                      xmlFree(fullname);
                  if (cont != NULL)
                      goto child_ok;
                }
                cont = elemDecl->content;
                while (cont != NULL) {
                    if (cont->type == XML_ELEMENT_CONTENT_ELEMENT) {
                      if (xmlStrEqual(cont->name, name)) break;
                  } else if ((cont->type == XML_ELEMENT_CONTENT_OR) &&
                     (cont->c1 != NULL) &&
                     (cont->c1->type == XML_ELEMENT_CONTENT_ELEMENT)) {
                      if (xmlStrEqual(cont->c1->name, name)) break;
                  } else if ((cont->type != XML_ELEMENT_CONTENT_OR) ||
                      (cont->c1 == NULL) ||
                      (cont->c1->type != XML_ELEMENT_CONTENT_PCDATA)) {
                      xmlErrValid(ctxt, XML_DTD_MIXED_CORRUPT, 
                            "Internal: MIXED struct corrupted\n",
                            NULL);
                      break;
                  }
                  cont = cont->c2;
                }
                if (cont == NULL) {
                  xmlErrValidNode(ctxt, elem, XML_DTD_INVALID_CHILD,
             "Element %s is not declared in %s list of possible children\n",
                         name, elem->name, NULL);
                  ret = 0;
                }
            }
child_ok:
              child = child->next;
          }
          break;
        case XML_ELEMENT_TYPE_ELEMENT:
          if ((doc->standalone == 1) && (extsubset == 1)) {
            /*
             * VC: Standalone Document Declaration
             *     - element types with element content, if white space
             *       occurs directly within any instance of those types.
             */
            child = elem->children;
            while (child != NULL) {
                if (child->type == XML_TEXT_NODE) {
                  const xmlChar *content = child->content;

                  while (IS_BLANK_CH(*content))
                      content++;
                  if (*content == 0) {
                      xmlErrValidNode(ctxt, elem,
                                      XML_DTD_STANDALONE_WHITE_SPACE,
"standalone: %s declared in the external subset contains white spaces nodes\n",
                           elem->name, NULL, NULL);
                      ret = 0;
                      break;
                  }
                }
                child =child->next;
            }
          }
          child = elem->children;
          cont = elemDecl->content;
          tmp = xmlValidateElementContent(ctxt, child, elemDecl, 1, elem);
          if (tmp <= 0)
            ret = tmp;
          break;
    }
    } /* not continuous */

    /* [ VC: Required Attribute ] */
    attr = elemDecl->attributes;
    while (attr != NULL) {
      if (attr->def == XML_ATTRIBUTE_REQUIRED) {
          int qualified = -1;

          if ((attr->prefix == NULL) &&
            (xmlStrEqual(attr->name, BAD_CAST "xmlns"))) {
            xmlNsPtr ns;

            ns = elem->nsDef;
            while (ns != NULL) {
                if (ns->prefix == NULL)
                  goto found;
                ns = ns->next;
            }
          } else if (xmlStrEqual(attr->prefix, BAD_CAST "xmlns")) {
            xmlNsPtr ns;

            ns = elem->nsDef;
            while (ns != NULL) {
                if (xmlStrEqual(attr->name, ns->prefix))
                  goto found;
                ns = ns->next;
            }
          } else {
            xmlAttrPtr attrib;
            
            attrib = elem->properties;
            while (attrib != NULL) {
                if (xmlStrEqual(attrib->name, attr->name)) {
                  if (attr->prefix != NULL) {
                      xmlNsPtr nameSpace = attrib->ns;

                      if (nameSpace == NULL)
                        nameSpace = elem->ns;
                      /*
                       * qualified names handling is problematic, having a
                       * different prefix should be possible but DTDs don't
                       * allow to define the URI instead of the prefix :-(
                       */
                      if (nameSpace == NULL) {
                        if (qualified < 0) 
                            qualified = 0;
                      } else if (!xmlStrEqual(nameSpace->prefix,
                                        attr->prefix)) {
                        if (qualified < 1) 
                            qualified = 1;
                      } else
                        goto found;
                  } else {
                      /*
                       * We should allow applications to define namespaces
                       * for their application even if the DTD doesn't 
                       * carry one, otherwise, basically we would always
                       * break.
                       */
                      goto found;
                  }
                }
                attrib = attrib->next;
            }
          }
          if (qualified == -1) {
            if (attr->prefix == NULL) {
                xmlErrValidNode(ctxt, elem, XML_DTD_MISSING_ATTRIBUTE,
                   "Element %s does not carry attribute %s\n",
                     elem->name, attr->name, NULL);
                ret = 0;
              } else {
                xmlErrValidNode(ctxt, elem, XML_DTD_MISSING_ATTRIBUTE,
                   "Element %s does not carry attribute %s:%s\n",
                     elem->name, attr->prefix,attr->name);
                ret = 0;
            }
          } else if (qualified == 0) {
            xmlErrValidWarning(ctxt, elem, XML_DTD_NO_PREFIX,
               "Element %s required attribute %s:%s has no prefix\n",
                   elem->name, attr->prefix, attr->name);
          } else if (qualified == 1) {
            xmlErrValidWarning(ctxt, elem, XML_DTD_DIFFERENT_PREFIX,
               "Element %s required attribute %s:%s has different prefix\n",
                   elem->name, attr->prefix, attr->name);
          }
      } else if (attr->def == XML_ATTRIBUTE_FIXED) {
          /*
           * Special tests checking #FIXED namespace declarations
           * have the right value since this is not done as an
           * attribute checking
           */
          if ((attr->prefix == NULL) &&
            (xmlStrEqual(attr->name, BAD_CAST "xmlns"))) {
            xmlNsPtr ns;

            ns = elem->nsDef;
            while (ns != NULL) {
                if (ns->prefix == NULL) {
                  if (!xmlStrEqual(attr->defaultValue, ns->href)) {
                      xmlErrValidNode(ctxt, elem,
                             XML_DTD_ELEM_DEFAULT_NAMESPACE,
   "Element %s namespace name for default namespace does not match the DTD\n",
                           elem->name, NULL, NULL);
                      ret = 0;
                  }
                  goto found;
                }
                ns = ns->next;
            }
          } else if (xmlStrEqual(attr->prefix, BAD_CAST "xmlns")) {
            xmlNsPtr ns;

            ns = elem->nsDef;
            while (ns != NULL) {
                if (xmlStrEqual(attr->name, ns->prefix)) {
                  if (!xmlStrEqual(attr->defaultValue, ns->href)) {
                      xmlErrValidNode(ctxt, elem, XML_DTD_ELEM_NAMESPACE,
               "Element %s namespace name for %s does not match the DTD\n",
                           elem->name, ns->prefix, NULL);
                      ret = 0;
                  }
                  goto found;
                }
                ns = ns->next;
            }
          }
      }
found:          
        attr = attr->nexth;
    }
    return(ret);
}

/**
 * xmlValidateRoot:
 * @ctxt:  the validation context
 * @doc:  a document instance
 *
 * Try to validate a the root element
 * basically it does the following check as described by the
 * XML-1.0 recommendation:
 *  - [ VC: Root Element Type ]
 * it doesn't try to recurse or apply other check to the element
 *
 * returns 1 if valid or 0 otherwise
 */

int
xmlValidateRoot(xmlValidCtxtPtr ctxt, xmlDocPtr doc) {
    xmlNodePtr root;
    int ret;

    if (doc == NULL) return(0);

    root = xmlDocGetRootElement(doc);
    if ((root == NULL) || (root->name == NULL)) {
      xmlErrValid(ctxt, XML_DTD_NO_ROOT,
                  "no root element\n", NULL);
        return(0);
    }

    /*
     * When doing post validation against a separate DTD, those may
     * no internal subset has been generated
     */
    if ((doc->intSubset != NULL) &&
      (doc->intSubset->name != NULL)) {
      /*
       * Check first the document root against the NQName
       */
      if (!xmlStrEqual(doc->intSubset->name, root->name)) {
          if ((root->ns != NULL) && (root->ns->prefix != NULL)) {
            xmlChar fn[50];
            xmlChar *fullname;
            
            fullname = xmlBuildQName(root->name, root->ns->prefix, fn, 50);
            if (fullname == NULL) {
                xmlVErrMemory(ctxt, NULL);
                return(0);
            }
            ret = xmlStrEqual(doc->intSubset->name, fullname);
            if ((fullname != fn) && (fullname != root->name))
                xmlFree(fullname);
            if (ret == 1)
                goto name_ok;
          } 
          if ((xmlStrEqual(doc->intSubset->name, BAD_CAST "HTML")) &&
            (xmlStrEqual(root->name, BAD_CAST "html")))
            goto name_ok;
          xmlErrValidNode(ctxt, root, XML_DTD_ROOT_NAME,
               "root and DTD name do not match '%s' and '%s'\n",
               root->name, doc->intSubset->name, NULL);
          return(0);
      }
    }
name_ok:
    return(1);
}


/**
 * xmlValidateElement:
 * @ctxt:  the validation context
 * @doc:  a document instance
 * @elem:  an element instance
 *
 * Try to validate the subtree under an element 
 *
 * returns 1 if valid or 0 otherwise
 */

int
xmlValidateElement(xmlValidCtxtPtr ctxt, xmlDocPtr doc, xmlNodePtr elem) {
    xmlNodePtr child;
    xmlAttrPtr attr;
    xmlNsPtr ns;
    const xmlChar *value;
    int ret = 1;

    if (elem == NULL) return(0);

    /*
     * XInclude elements were added after parsing in the infoset,
     * they don't really mean anything validation wise.
     */
    if ((elem->type == XML_XINCLUDE_START) ||
      (elem->type == XML_XINCLUDE_END))
      return(1);

    CHECK_DTD;

    /*
     * Entities references have to be handled separately
     */
    if (elem->type == XML_ENTITY_REF_NODE) {
      return(1);
    }

    ret &= xmlValidateOneElement(ctxt, doc, elem);
    if (elem->type == XML_ELEMENT_NODE) {
      attr = elem->properties;
      while (attr != NULL) {
          value = xmlNodeListGetString(doc, attr->children, 0);
          ret &= xmlValidateOneAttribute(ctxt, doc, elem, attr, value);
          if (value != NULL)
            xmlFree((char *)value);
          attr= attr->next;
      }
      ns = elem->nsDef;
      while (ns != NULL) {
          if (elem->ns == NULL)
            ret &= xmlValidateOneNamespace(ctxt, doc, elem, NULL,
                                     ns, ns->href);
          else
            ret &= xmlValidateOneNamespace(ctxt, doc, elem,
                                           elem->ns->prefix, ns, ns->href);
          ns = ns->next;
      }
    }
    child = elem->children;
    while (child != NULL) {
        ret &= xmlValidateElement(ctxt, doc, child);
        child = child->next;
    }

    return(ret);
}

/**
 * xmlValidateRef:
 * @ref:   A reference to be validated
 * @ctxt:  Validation context
 * @name:  Name of ID we are searching for
 *
 */
static void
xmlValidateRef(xmlRefPtr ref, xmlValidCtxtPtr ctxt,
                         const xmlChar *name) {
    xmlAttrPtr id;
    xmlAttrPtr attr;

    if (ref == NULL)
      return;
    if ((ref->attr == NULL) && (ref->name == NULL))
      return;
    attr = ref->attr;
    if (attr == NULL) {
      xmlChar *dup, *str = NULL, *cur, save;

      dup = xmlStrdup(name);
      if (dup == NULL) {
          ctxt->valid = 0;
          return;
      }
      cur = dup;
      while (*cur != 0) {
          str = cur;
          while ((*cur != 0) && (!IS_BLANK_CH(*cur))) cur++;
          save = *cur;
          *cur = 0;
          id = xmlGetID(ctxt->doc, str);
          if (id == NULL) {
            xmlErrValidNodeNr(ctxt, NULL, XML_DTD_UNKNOWN_ID,
         "attribute %s line %d references an unknown ID \"%s\"\n",
                   ref->name, ref->lineno, str);
            ctxt->valid = 0;
          }
          if (save == 0)
            break;
          *cur = save;
          while (IS_BLANK_CH(*cur)) cur++;
      }
      xmlFree(dup);
    } else if (attr->atype == XML_ATTRIBUTE_IDREF) {
      id = xmlGetID(ctxt->doc, name);
      if (id == NULL) {
          xmlErrValidNode(ctxt, attr->parent, XML_DTD_UNKNOWN_ID,
         "IDREF attribute %s references an unknown ID \"%s\"\n",
               attr->name, name, NULL);
          ctxt->valid = 0;
      }
    } else if (attr->atype == XML_ATTRIBUTE_IDREFS) {
      xmlChar *dup, *str = NULL, *cur, save;

      dup = xmlStrdup(name);
      if (dup == NULL) {
          xmlVErrMemory(ctxt, "IDREFS split");
          ctxt->valid = 0;
          return;
      }
      cur = dup;
      while (*cur != 0) {
          str = cur;
          while ((*cur != 0) && (!IS_BLANK_CH(*cur))) cur++;
          save = *cur;
          *cur = 0;
          id = xmlGetID(ctxt->doc, str);
          if (id == NULL) {
            xmlErrValidNode(ctxt, attr->parent, XML_DTD_UNKNOWN_ID,
         "IDREFS attribute %s references an unknown ID \"%s\"\n",
                       attr->name, str, NULL);
            ctxt->valid = 0;
          }
          if (save == 0)
            break;
          *cur = save;
          while (IS_BLANK_CH(*cur)) cur++;
      }
      xmlFree(dup);
    }
}

/**
 * xmlWalkValidateList:
 * @data:  Contents of current link
 * @user:  Value supplied by the user
 *
 * Returns 0 to abort the walk or 1 to continue
 */
static int
xmlWalkValidateList(const void *data, const void *user)
{
      xmlValidateMemoPtr memo = (xmlValidateMemoPtr)user;
      xmlValidateRef((xmlRefPtr)data, memo->ctxt, memo->name);
      return 1;
}

/**
 * xmlValidateCheckRefCallback:
 * @ref_list:  List of references
 * @ctxt:  Validation context
 * @name:  Name of ID we are searching for
 *
 */
static void
xmlValidateCheckRefCallback(xmlListPtr ref_list, xmlValidCtxtPtr ctxt,
                         const xmlChar *name) {
    xmlValidateMemo memo;

    if (ref_list == NULL)
      return;
    memo.ctxt = ctxt;
    memo.name = name;

    xmlListWalk(ref_list, xmlWalkValidateList, &memo);
    
}

/**
 * xmlValidateDocumentFinal:
 * @ctxt:  the validation context
 * @doc:  a document instance
 *
 * Does the final step for the document validation once all the
 * incremental validation steps have been completed
 *
 * basically it does the following checks described by the XML Rec
 * 
 * Check all the IDREF/IDREFS attributes definition for validity
 *
 * returns 1 if valid or 0 otherwise
 */

int
xmlValidateDocumentFinal(xmlValidCtxtPtr ctxt, xmlDocPtr doc) {
    xmlRefTablePtr table;

    if (ctxt == NULL)
        return(0);
    if (doc == NULL) {
        xmlErrValid(ctxt, XML_DTD_NO_DOC, 
            "xmlValidateDocumentFinal: doc == NULL\n", NULL);
      return(0);
    }

    /*
     * Check all the NOTATION/NOTATIONS attributes
     */
    /*
     * Check all the ENTITY/ENTITIES attributes definition for validity
     */
    /*
     * Check all the IDREF/IDREFS attributes definition for validity
     */
    table = (xmlRefTablePtr) doc->refs;
    ctxt->doc = doc;
    ctxt->valid = 1;
    xmlHashScan(table, (xmlHashScanner) xmlValidateCheckRefCallback, ctxt);
    return(ctxt->valid);
}

/**
 * xmlValidateDtd:
 * @ctxt:  the validation context
 * @doc:  a document instance
 * @dtd:  a dtd instance
 *
 * Try to validate the document against the dtd instance
 *
 * Basically it does check all the definitions in the DtD.
 * Note the the internal subset (if present) is de-coupled
 * (i.e. not used), which could give problems if ID or IDREF
 * is present.
 *
 * returns 1 if valid or 0 otherwise
 */

int
xmlValidateDtd(xmlValidCtxtPtr ctxt, xmlDocPtr doc, xmlDtdPtr dtd) {
    int ret;
    xmlDtdPtr oldExt, oldInt;
    xmlNodePtr root;

    if (dtd == NULL) return(0);
    if (doc == NULL) return(0);
    oldExt = doc->extSubset;
    oldInt = doc->intSubset;
    doc->extSubset = dtd;
    doc->intSubset = NULL;
    ret = xmlValidateRoot(ctxt, doc);
    if (ret == 0) {
      doc->extSubset = oldExt;
      doc->intSubset = oldInt;
      return(ret);
    }
    if (doc->ids != NULL) {
          xmlFreeIDTable(doc->ids);
          doc->ids = NULL;
    }
    if (doc->refs != NULL) {
          xmlFreeRefTable(doc->refs);
          doc->refs = NULL;
    }
    root = xmlDocGetRootElement(doc);
    ret = xmlValidateElement(ctxt, doc, root);
    ret &= xmlValidateDocumentFinal(ctxt, doc);
    doc->extSubset = oldExt;
    doc->intSubset = oldInt;
    return(ret);
}

static void
xmlValidateNotationCallback(xmlEntityPtr cur, xmlValidCtxtPtr ctxt,
                          const xmlChar *name ATTRIBUTE_UNUSED) {
    if (cur == NULL)
      return;
    if (cur->etype == XML_EXTERNAL_GENERAL_UNPARSED_ENTITY) {
      xmlChar *notation = cur->content;

      if (notation != NULL) {
          int ret;

          ret = xmlValidateNotationUse(ctxt, cur->doc, notation);
          if (ret != 1) {
            ctxt->valid = 0;
          }
      }
    }
}

static void
xmlValidateAttributeCallback(xmlAttributePtr cur, xmlValidCtxtPtr ctxt,
                          const xmlChar *name ATTRIBUTE_UNUSED) {
    int ret;
    xmlDocPtr doc;
    xmlElementPtr elem = NULL;

    if (cur == NULL)
      return;
    switch (cur->atype) {
      case XML_ATTRIBUTE_CDATA:
      case XML_ATTRIBUTE_ID:
      case XML_ATTRIBUTE_IDREF      :
      case XML_ATTRIBUTE_IDREFS:
      case XML_ATTRIBUTE_NMTOKEN:
      case XML_ATTRIBUTE_NMTOKENS:
      case XML_ATTRIBUTE_ENUMERATION:
          break;
      case XML_ATTRIBUTE_ENTITY:
      case XML_ATTRIBUTE_ENTITIES:
      case XML_ATTRIBUTE_NOTATION:
          if (cur->defaultValue != NULL) {
            
            ret = xmlValidateAttributeValue2(ctxt, ctxt->doc, cur->name,
                                           cur->atype, cur->defaultValue);
            if ((ret == 0) && (ctxt->valid == 1))
                ctxt->valid = 0;
          }
          if (cur->tree != NULL) {
            xmlEnumerationPtr tree = cur->tree;
            while (tree != NULL) {
                ret = xmlValidateAttributeValue2(ctxt, ctxt->doc,
                            cur->name, cur->atype, tree->name);
                if ((ret == 0) && (ctxt->valid == 1))
                  ctxt->valid = 0;
                tree = tree->next;
            }
          }
    }
    if (cur->atype == XML_ATTRIBUTE_NOTATION) {
      doc = cur->doc;
      if (cur->elem == NULL) {
          xmlErrValid(ctxt, XML_ERR_INTERNAL_ERROR,
               "xmlValidateAttributeCallback(%s): internal error\n",
               (const char *) cur->name);
          return;
      }

      if (doc != NULL)
          elem = xmlGetDtdElementDesc(doc->intSubset, cur->elem);
      if ((elem == NULL) && (doc != NULL))
          elem = xmlGetDtdElementDesc(doc->extSubset, cur->elem);
      if ((elem == NULL) && (cur->parent != NULL) &&
          (cur->parent->type == XML_DTD_NODE))
          elem = xmlGetDtdElementDesc((xmlDtdPtr) cur->parent, cur->elem);
      if (elem == NULL) {
          xmlErrValidNode(ctxt, NULL, XML_DTD_UNKNOWN_ELEM,
               "attribute %s: could not find decl for element %s\n",
               cur->name, cur->elem, NULL);
          return;
      }
      if (elem->etype == XML_ELEMENT_TYPE_EMPTY) {
          xmlErrValidNode(ctxt, NULL, XML_DTD_EMPTY_NOTATION,
               "NOTATION attribute %s declared for EMPTY element %s\n",
               cur->name, cur->elem, NULL);
          ctxt->valid = 0;
      }
    }
}

/**
 * xmlValidateDtdFinal:
 * @ctxt:  the validation context
 * @doc:  a document instance
 *
 * Does the final step for the dtds validation once all the
 * subsets have been parsed
 *
 * basically it does the following checks described by the XML Rec
 * - check that ENTITY and ENTITIES type attributes default or 
 *   possible values matches one of the defined entities.
 * - check that NOTATION type attributes default or 
 *   possible values matches one of the defined notations.
 *
 * returns 1 if valid or 0 if invalid and -1 if not well-formed
 */

int
xmlValidateDtdFinal(xmlValidCtxtPtr ctxt, xmlDocPtr doc) {
    xmlDtdPtr dtd;
    xmlAttributeTablePtr table;
    xmlEntitiesTablePtr entities;

    if (doc == NULL) return(0);
    if ((doc->intSubset == NULL) && (doc->extSubset == NULL))
      return(0);
    ctxt->doc = doc;
    ctxt->valid = 1;
    dtd = doc->intSubset;
    if ((dtd != NULL) && (dtd->attributes != NULL)) {
      table = (xmlAttributeTablePtr) dtd->attributes;
      xmlHashScan(table, (xmlHashScanner) xmlValidateAttributeCallback, ctxt);
    }
    if ((dtd != NULL) && (dtd->entities != NULL)) {
      entities = (xmlEntitiesTablePtr) dtd->entities;
      xmlHashScan(entities, (xmlHashScanner) xmlValidateNotationCallback,
                ctxt);
    }
    dtd = doc->extSubset;
    if ((dtd != NULL) && (dtd->attributes != NULL)) {
      table = (xmlAttributeTablePtr) dtd->attributes;
      xmlHashScan(table, (xmlHashScanner) xmlValidateAttributeCallback, ctxt);
    }
    if ((dtd != NULL) && (dtd->entities != NULL)) {
      entities = (xmlEntitiesTablePtr) dtd->entities;
      xmlHashScan(entities, (xmlHashScanner) xmlValidateNotationCallback,
                ctxt);
    }
    return(ctxt->valid);
}

/**
 * xmlValidateDocument:
 * @ctxt:  the validation context
 * @doc:  a document instance
 *
 * Try to validate the document instance
 *
 * basically it does the all the checks described by the XML Rec
 * i.e. validates the internal and external subset (if present)
 * and validate the document tree.
 *
 * returns 1 if valid or 0 otherwise
 */

int
xmlValidateDocument(xmlValidCtxtPtr ctxt, xmlDocPtr doc) {
    int ret;
    xmlNodePtr root;

    if (doc == NULL)
        return(0);
    if ((doc->intSubset == NULL) && (doc->extSubset == NULL)) {
        xmlErrValid(ctxt, XML_DTD_NO_DTD,
                  "no DTD found!\n", NULL);
      return(0);
    }
    if ((doc->intSubset != NULL) && ((doc->intSubset->SystemID != NULL) ||
      (doc->intSubset->ExternalID != NULL)) && (doc->extSubset == NULL)) {
      xmlChar *sysID;
      if (doc->intSubset->SystemID != NULL) {
          sysID = xmlBuildURI(doc->intSubset->SystemID,
                  doc->URL);
          if (sysID == NULL) {
              xmlErrValid(ctxt, XML_DTD_LOAD_ERROR,
                  "Could not build URI for external subset \"%s\"\n",
                  (const char *) doc->intSubset->SystemID);
            return 0;
          }
      } else
          sysID = NULL;
        doc->extSubset = xmlParseDTD(doc->intSubset->ExternalID,
                  (const xmlChar *)sysID);
      if (sysID != NULL)
          xmlFree(sysID);
        if (doc->extSubset == NULL) {
          if (doc->intSubset->SystemID != NULL) {
            xmlErrValid(ctxt, XML_DTD_LOAD_ERROR,
                   "Could not load the external subset \"%s\"\n",
                   (const char *) doc->intSubset->SystemID);
          } else {
            xmlErrValid(ctxt, XML_DTD_LOAD_ERROR,
                   "Could not load the external subset \"%s\"\n",
                   (const char *) doc->intSubset->ExternalID);
          }
          return(0);
      }
    }

    if (doc->ids != NULL) {
          xmlFreeIDTable(doc->ids);
          doc->ids = NULL;
    }
    if (doc->refs != NULL) {
          xmlFreeRefTable(doc->refs);
          doc->refs = NULL;
    }
    ret = xmlValidateDtdFinal(ctxt, doc);
    if (!xmlValidateRoot(ctxt, doc)) return(0);

    root = xmlDocGetRootElement(doc);
    ret &= xmlValidateElement(ctxt, doc, root);
    ret &= xmlValidateDocumentFinal(ctxt, doc);
    return(ret);
}

/************************************************************************
 *                                                    *
 *          Routines for dynamic validation editing               *
 *                                                    *
 ************************************************************************/

/**
 * xmlValidGetPotentialChildren:
 * @ctree:  an element content tree
 * @names:  an array to store the list of child names
 * @len:  a pointer to the number of element in the list
 * @max:  the size of the array
 *
 * Build/extend a list of  potential children allowed by the content tree
 *
 * returns the number of element in the list, or -1 in case of error.
 */

int
xmlValidGetPotentialChildren(xmlElementContent *ctree,
                             const xmlChar **names,
                             int *len, int max) {
    int i;

    if ((ctree == NULL) || (names == NULL) || (len == NULL))
        return(-1);
    if (*len >= max) return(*len);

    switch (ctree->type) {
      case XML_ELEMENT_CONTENT_PCDATA: 
          for (i = 0; i < *len;i++)
            if (xmlStrEqual(BAD_CAST "#PCDATA", names[i])) return(*len);
          names[(*len)++] = BAD_CAST "#PCDATA";
          break;
      case XML_ELEMENT_CONTENT_ELEMENT: 
          for (i = 0; i < *len;i++)
            if (xmlStrEqual(ctree->name, names[i])) return(*len);
          names[(*len)++] = ctree->name;
          break;
      case XML_ELEMENT_CONTENT_SEQ: 
          xmlValidGetPotentialChildren(ctree->c1, names, len, max);
          xmlValidGetPotentialChildren(ctree->c2, names, len, max);
          break;
      case XML_ELEMENT_CONTENT_OR:
          xmlValidGetPotentialChildren(ctree->c1, names, len, max);
          xmlValidGetPotentialChildren(ctree->c2, names, len, max);
          break;
   }
   
   return(*len);
}

/*
 * Dummy function to suppress messages while we try out valid elements
 */
static void XMLCDECL xmlNoValidityErr(void *ctx ATTRIBUTE_UNUSED,
                                const char *msg ATTRIBUTE_UNUSED, ...) {
    return;
}

/**
 * xmlValidGetValidElements:
 * @prev:  an element to insert after
 * @next:  an element to insert next
 * @names:  an array to store the list of child names
 * @max:  the size of the array
 *
 * This function returns the list of authorized children to insert
 * within an existing tree while respecting the validity constraints
 * forced by the Dtd. The insertion point is defined using @prev and
 * @next in the following ways:
 *  to insert before 'node': xmlValidGetValidElements(node->prev, node, ...
 *  to insert next 'node': xmlValidGetValidElements(node, node->next, ...
 *  to replace 'node': xmlValidGetValidElements(node->prev, node->next, ...
 *  to prepend a child to 'node': xmlValidGetValidElements(NULL, node->childs,
 *  to append a child to 'node': xmlValidGetValidElements(node->last, NULL, ...
 *
 * pointers to the element names are inserted at the beginning of the array
 * and do not need to be freed.
 *
 * returns the number of element in the list, or -1 in case of error. If
 *    the function returns the value @max the caller is invited to grow the
 *    receiving array and retry.
 */

int
xmlValidGetValidElements(xmlNode *prev, xmlNode *next, const xmlChar **names,
                         int max) {
    xmlValidCtxt vctxt;
    int nb_valid_elements = 0;
    const xmlChar *elements[256];
    int nb_elements = 0, i;
    const xmlChar *name;
    
    xmlNode *ref_node;
    xmlNode *parent;
    xmlNode *test_node;
    
    xmlNode *prev_next;
    xmlNode *next_prev;
    xmlNode *parent_childs;
    xmlNode *parent_last;
    
    xmlElement *element_desc;

    if (prev == NULL && next == NULL)
        return(-1);

    if (names == NULL) return(-1);
    if (max <= 0) return(-1);

    memset(&vctxt, 0, sizeof (xmlValidCtxt));
    vctxt.error = xmlNoValidityErr; /* this suppresses err/warn output */

    nb_valid_elements = 0;
    ref_node = prev ? prev : next;
    parent = ref_node->parent;

    /*
     * Retrieves the parent element declaration
     */
    element_desc = xmlGetDtdElementDesc(parent->doc->intSubset,
                                         parent->name);
    if ((element_desc == NULL) && (parent->doc->extSubset != NULL))
        element_desc = xmlGetDtdElementDesc(parent->doc->extSubset,
                                             parent->name);
    if (element_desc == NULL) return(-1);
      
    /*
     * Do a backup of the current tree structure
     */
    prev_next = prev ? prev->next : NULL;
    next_prev = next ? next->prev : NULL;
    parent_childs = parent->children;
    parent_last = parent->last;

    /*
     * Creates a dummy node and insert it into the tree
     */    
    test_node = xmlNewDocNode (ref_node->doc, NULL, BAD_CAST "<!dummy?>", NULL);
    test_node->parent = parent;
    test_node->prev = prev;
    test_node->next = next;
    name = test_node->name;
    
    if (prev) prev->next = test_node;
    else parent->children = test_node;
            
    if (next) next->prev = test_node;
    else parent->last = test_node;

    /*
     * Insert each potential child node and check if the parent is
     * still valid
     */
    nb_elements = xmlValidGetPotentialChildren(element_desc->content,
                   elements, &nb_elements, 256);
    
    for (i = 0;i < nb_elements;i++) {
      test_node->name = elements[i];
      if (xmlValidateOneElement(&vctxt, parent->doc, parent)) {
          int j;

          for (j = 0; j < nb_valid_elements;j++)
            if (xmlStrEqual(elements[i], names[j])) break;
          names[nb_valid_elements++] = elements[i];
          if (nb_valid_elements >= max) break;
      }
    }

    /*
     * Restore the tree structure
     */
    if (prev) prev->next = prev_next;
    if (next) next->prev = next_prev;
    parent->children = parent_childs;
    parent->last = parent_last;

    /*
     * Free up the dummy node
     */
    test_node->name = name;
    xmlFreeNode(test_node);

    return(nb_valid_elements);
}
#endif /* LIBXML_VALID_ENABLED */

#define bottom_valid
#include "elfgcchack.h"

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