IGXMLScanner.cpp

                            , false
                            , fMemoryManager
                        );
                        fAttrList->addElement(curAtt);
                        curAttListSize++;
                    }
                    else
                    {
                        curAtt = fAttrList->elementAt(attCount);
                        curAtt->set
                        (
                            -1
                            , curDef.getFullName()
                            , XMLUni::fgZeroLenString
                            , curDef.getValue()
                            , curDef.getType()
                        );
                        curAtt->setSpecified(false);
                    }
                    attCount++;
                }
            }
        }
    }

    //  If empty, validate content right now if we are validating and then
    //  pop the element stack top. Else, we have to update the current stack
    //  top's namespace mapping elements.
    if (isEmpty)
    {
        // If validating, then insure that its legal to have no content
        if (fValidate)
        {
            const int res = fValidator->checkContent(elemDecl, 0, 0);
            if (res >= 0)
            {
                fValidator->emitError
                (
                    XMLValid::ElementNotValidForContent
                    , elemDecl->getFullName()
                    , elemDecl->getFormattedContentModel()
                );
            }
        }

        // Pop the element stack back off since it'll never be used now
        fElemStack.popTop();

        // If the elem stack is empty, then it was an empty root
        if (isRoot)
            gotData = false;
        else {
            // Restore the validation flag
            fValidate = fElemStack.getValidationFlag();
        }
    }

    //  If we have a document handler, then tell it about this start tag. We
    //  don't have any URI id to send along, so send fEmptyNamespaceId. We also do not send
    //  any prefix since its just one big name if we are not doing namespaces.
    if (fDocHandler)
    {
        fDocHandler->startElement
        (
            *elemDecl
            , fEmptyNamespaceId
            , 0
            , *fAttrList
            , attCount
            , isEmpty
            , isRoot
        );
    }

    return true;
}


//  This method is called to scan a start tag when we are processing
//  namespaces. There are two different versions of this method, one for
//  namespace aware processing and one for non-namespace aware processing.
//
//  This method is called after we've scanned the < of a start tag. So we
//  have to get the element name, then scan the attributes, after which
//  we are either going to see >, />, or attributes followed by one of those
//  sequences.
bool IGXMLScanner::scanStartTagNS(bool& gotData)
{
    //  Assume we will still have data until proven otherwise. It will only
    //  ever be false if this is the root and its empty.
    gotData = true;

    // Reset element content buffer
    fContent.reset();

    //  The current position is after the open bracket, so we need to read in
    //  in the element name.
    if (!fReaderMgr.getName(fQNameBuf))
    {
        emitError(XMLErrs::ExpectedElementName);
        fReaderMgr.skipToChar(chOpenAngle);
        return false;
    }

    // See if its the root element
    const bool isRoot = fElemStack.isEmpty();

    // Skip any whitespace after the name
    fReaderMgr.skipPastSpaces();

    //  First we have to do the rawest attribute scan. We don't do any
    //  normalization of them at all, since we don't know yet what type they
    //  might be (since we need the element decl in order to do that.)
    bool isEmpty;
    unsigned int attCount = rawAttrScan
    (
        fQNameBuf.getRawBuffer()
        , *fRawAttrList
        , isEmpty
    );

    // save the contentleafname and currentscope before addlevel, for later use
    ContentLeafNameTypeVector* cv = 0;
    XMLContentModel* cm = 0;
    int currentScope = Grammar::TOP_LEVEL_SCOPE;
    bool laxThisOne = false;

    if (!isRoot && fGrammarType == Grammar::SchemaGrammarType) {
        // schema validator will have correct type
        ComplexTypeInfo *currType = ((SchemaValidator*)fValidator)->getCurrentTypeInfo();
        SchemaElementDecl::ModelTypes modelType = (currType)
                ? ((SchemaElementDecl::ModelTypes)currType->getContentType())
                : ((SchemaElementDecl*) fElemStack.topElement()->fThisElement)->getModelType();

        if ((modelType == SchemaElementDecl::Mixed_Simple)
          ||  (modelType == SchemaElementDecl::Mixed_Complex)
          ||  (modelType == SchemaElementDecl::Children))
        {
            cm = currType->getContentModel();
            cv = cm->getContentLeafNameTypeVector();
            currentScope = fElemStack.getCurrentScope();
        }
        else if (modelType == SchemaElementDecl::Any) {
            laxThisOne = true;
        }
    }

    //  Now, since we might have to update the namespace map for this element,
    //  but we don't have the element decl yet, we just tell the element stack
    //  to expand up to get ready.
    unsigned int elemDepth = fElemStack.addLevel();
    fElemStack.setValidationFlag(fValidate);

    //  Check if there is any external schema location specified, and if we are at root,
    //  go through them first before scanning those specified in the instance document
    if (isRoot
        && fDoSchema
        && (fExternalSchemaLocation || fExternalNoNamespaceSchemaLocation)) {

        if (fExternalSchemaLocation)
            parseSchemaLocation(fExternalSchemaLocation);
        if (fExternalNoNamespaceSchemaLocation)
            resolveSchemaGrammar(fExternalNoNamespaceSchemaLocation, XMLUni::fgZeroLenString);
    }

    //  Make an initial pass through the list and find any xmlns attributes or
    //  schema attributes.
    if (attCount)
      scanRawAttrListforNameSpaces(fRawAttrList, attCount);

    //  Also find any default or fixed xmlns attributes in DTD defined for
    //  this element.
    XMLElementDecl* elemDecl = 0;
    if (fGrammarType == Grammar::DTDGrammarType) {
        const XMLCh *rawQName = fQNameBuf.getRawBuffer();
        elemDecl = fGrammar->getElemDecl
        (
            fEmptyNamespaceId
            , 0
            , rawQName
            , Grammar::TOP_LEVEL_SCOPE
        );
        // may have not been declared:
        if(!elemDecl)
            elemDecl = fDTDElemNonDeclPool->getByKey(rawQName);
        if (elemDecl) {
            if (elemDecl->hasAttDefs()) {
                XMLAttDefList& attDefList = elemDecl->getAttDefList();
                for(unsigned int i=0; i<attDefList.getAttDefCount(); i++)
                {
                    // Get the current att def, for convenience and its def type
                    const XMLAttDef& curDef = attDefList.getAttDef(i);
                    const XMLAttDef::DefAttTypes defType = curDef.getDefaultType();

                    // update the NSMap if there are any default/fixed xmlns attributes
                    if ((defType == XMLAttDef::Default)
                    ||  (defType == XMLAttDef::Fixed))
                    {
                        const XMLCh* rawPtr = curDef.getFullName();
                        if (!XMLString::compareNString(rawPtr, XMLUni::fgXMLNSColonString, 6)
                        ||  XMLString::equals(rawPtr, XMLUni::fgXMLNSString))
                            updateNSMap(rawPtr, curDef.getValue());
                    }
                }
            }
        }
    }

    //  Resolve the qualified name to a URI and name so that we can look up
    //  the element decl for this element. We have now update the prefix to
    //  namespace map so we should get the correct element now.
    int prefixColonPos = -1;
    const XMLCh* qnameRawBuf = fQNameBuf.getRawBuffer();
    unsigned int uriId = resolveQName
    (
        qnameRawBuf
        , fPrefixBuf
        , ElemStack::Mode_Element
        , prefixColonPos
    );

    //if schema, check if we should lax or skip the validation of this element
    bool parentValidation = fValidate;
    if (cv) {
        QName element(fPrefixBuf.getRawBuffer(), &qnameRawBuf[prefixColonPos + 1], uriId, fMemoryManager);
        // elementDepth will be > 0, as cv is only constructed if element is not
        // root.
        laxThisOne = laxElementValidation(&element, cv, cm, elemDepth - 1);
    }

    //  Look up the element now in the grammar. This will get us back a
    //  generic element decl object. We tell him to fault one in if he does
    //  not find it.
    bool wasAdded = false;
    bool errorBeforeElementFound = false;
    bool laxBeforeElementFound = false;

    const XMLCh* nameRawBuf = &qnameRawBuf[prefixColonPos + 1];
    const XMLCh* original_uriStr = fGrammar->getTargetNamespace();
    unsigned orgGrammarUri = fURIStringPool->getId(original_uriStr);

    // REVISIT:  since all this code only really
    // makes sense for schemas, why can DTD validation theoretically pass 
    // through it?  - NG
    if (uriId != fEmptyNamespaceId) {

        // Check in current grammar before switching if necessary
        const XMLCh *rawQName = fQNameBuf.getRawBuffer();
        elemDecl = fGrammar->getElemDecl
        (
          uriId
          , nameRawBuf
          , rawQName
          , currentScope
        );
        // may have not been declared; must look everywhere:
        if (!elemDecl)
            if(fGrammarType == Grammar::DTDGrammarType) 
            {
                // should never occur in practice
                elemDecl = fDTDElemNonDeclPool->getByKey(rawQName);
            }
            else if (fGrammarType == Grammar::SchemaGrammarType) 
            {
                elemDecl = fSchemaElemNonDeclPool->getByKey(nameRawBuf, uriId, currentScope);
            }

        if (!elemDecl && (orgGrammarUri != uriId)) {
            // not found, switch to the specified grammar
            const XMLCh* uriStr = getURIText(uriId);
            bool errorCondition = !switchGrammar(uriStr) && fValidate;
            if (errorCondition && !laxThisOne)
            {
                fValidator->emitError
                (
                    XMLValid::GrammarNotFound
                    ,uriStr
                );
                errorBeforeElementFound = true;
            }
            else if(errorCondition)
                laxBeforeElementFound = true;

            elemDecl = fGrammar->getElemDecl
            (
              uriId
              , nameRawBuf
              , qnameRawBuf
              , currentScope
            );
        }

        if (!elemDecl && currentScope != Grammar::TOP_LEVEL_SCOPE) {
            // if not found, then it may be a reference, try TOP_LEVEL_SCOPE
            elemDecl = fGrammar->getElemDecl
                       (
                           uriId
                           , nameRawBuf
                           , qnameRawBuf
                           , Grammar::TOP_LEVEL_SCOPE
                       );

            if(!elemDecl) 
            {
                // look in the list of undeclared elements, as would have been done
                // before we made grammars stateless:
                elemDecl = fSchemaElemNonDeclPool->getByKey(nameRawBuf, uriId, Grammar::TOP_LEVEL_SCOPE);
            }
            if(!elemDecl) {
                // still not found in specified uri
                // try emptyNamesapce see if element should be un-qualified.
                elemDecl = fGrammar->getElemDecl
                           (
                               fEmptyNamespaceId
                               , nameRawBuf
                               , qnameRawBuf
                               , currentScope
                           );

                bool errorCondition = elemDecl && elemDecl->getCreateReason() != XMLElementDecl::JustFaultIn;
                if (errorCondition && fValidate) {
                    fValidator->emitError
                    (
                        XMLValid::ElementNotUnQualified
                        , elemDecl->getFullName()
                    );
                    errorBeforeElementFound = true;
                }
                else if(errorCondition)
                    laxBeforeElementFound = true;
            }
        }

        if (!elemDecl) {
            // still not found, fault this in and issue error later
            // switch back to original grammar first
            switchGrammar(original_uriStr);
            if(fGrammarType == Grammar::DTDGrammarType) 
            {
                elemDecl = new (fMemoryManager) DTDElementDecl
                (
                    qnameRawBuf
                    , uriId
                    , DTDElementDecl::Any
                    , fMemoryManager
                );
                elemDecl->setId(fDTDElemNonDeclPool->put((DTDElementDecl*)elemDecl));
            } else if (fGrammarType == Grammar::SchemaGrammarType) 
            {
                elemDecl = new (fMemoryManager) SchemaElementDecl
                (
                    fPrefixBuf.getRawBuffer()
                    , nameRawBuf
                    , uriId
                    , SchemaElementDecl::Any
                    , Grammar::TOP_LEVEL_SCOPE
                    , fMemoryManager
                );
                elemDecl->setId(fSchemaElemNonDeclPool->put((void*)elemDecl->getBaseName(), uriId, currentScope, (SchemaElementDecl*)elemDecl));
            }
            wasAdded = true;
        }
    }
    else if (!elemDecl)
    {
        //the element has no prefix,
        //thus it is either a non-qualified element defined in current targetNS
        //or an element that is defined in the globalNS

        //try unqualified first
        elemDecl = fGrammar->getElemDecl
                   (
                      uriId
                    , nameRawBuf
                    , qnameRawBuf
                    , currentScope
                    );

        // may have not been declared; must look everywhere:
        if(!elemDecl)
            if (fGrammarType == Grammar::DTDGrammarType) 
            {
                // should never happen in practice?
                elemDecl = fDTDElemNonDeclPool->getByKey(qnameRawBuf);
            }
            else if (fGrammarType == Grammar::SchemaGrammarType) 
            {
                // look in the list of undeclared elements, as would have been done
                // before we made grammars stateless:
                elemDecl = fSchemaElemNonDeclPool->getByKey(nameRawBuf, uriId, currentScope);
            }
        if (!elemDecl && orgGrammarUri != fEmptyNamespaceId) {
            //not found, switch grammar and try globalNS
            bool errorCondition = !switchGrammar(XMLUni::fgZeroLenString) && fValidate;
            if (errorCondition && !laxThisOne)
            {
                fValidator->emitError
                (
                    XMLValid::GrammarNotFound
                  , XMLUni::fgZeroLenString
                );
                errorBeforeElementFound = true;
            }
            else if(errorCondition)
                laxBeforeElementFound = true;

            elemDecl = fGrammar->getElemDecl
            (
              uriId
              , nameRawBuf
              , qnameRawBuf
              , currentScope
            );
        }

        if (!elemDecl && currentScope != Grammar::TOP_LEVEL_SCOPE) {
            // if not found, then it may be a reference, try TOP_LEVEL_SCOPE
            elemDecl = fGrammar->getElemDecl
                       (
                           uriId
                           , nameRawBuf
                           , qnameRawBuf
                           , Grammar::TOP_LEVEL_SCOPE
                       );
            if(!elemDecl)
            {
                // look in the list of undeclared elements, as would have been done
                // before we made grammars stateless:
                elemDecl = fSchemaElemNonDeclPool->getByKey(nameRawBuf, uriId, Grammar::TOP_LEVEL_SCOPE);
            }

            if (!elemDecl && orgGrammarUri != fEmptyNamespaceId) {
                // still Not found in specified uri
                // go to original Grammar again to see if element needs to be fully qualified.
                bool errorCondition = !switchGrammar(original_uriStr) && fValidate;
                if (errorCondition && !laxThisOne)
                {
                    const XMLCh* uriStr = getURIText(orgGrammarUri);
                    fValidator->emitError
                    (
                        XMLValid::GrammarNotFound
                        ,original_uriStr
                    );
                    errorBeforeElementFound = true;
                }
                else if(errorCondition)
                    laxBeforeElementFound = true;

                elemDecl = fGrammar->getElemDecl
                           (
                               orgGrammarUri
                               , nameRawBuf
                               , qnameRawBuf
                               , currentScope
                           );
                if (elemDecl && elemDecl->getCreateReason() != XMLElementDecl::JustFaultIn && fValidate) {
                    fValidator->emitError
                    (
                        XMLValid::ElementNotQualified
                        , elemDecl->getFullName()
                    );
                    errorBeforeElementFound = true;
                }
            }
        }

        if (!elemDecl) {
            // still not found, fault this in and issue error later
            // switch back to original grammar first
            switchGrammar(original_uriStr);
            if(fGrammarType == Grammar::DTDGrammarType) 
            {
                elemDecl = new (fMemoryManager) DTDElementDecl
                (
                    qnameRawBuf
                    , uriId
                    , DTDElementDecl::Any
                    , fMemoryManager
                );
                elemDecl->setId(fDTDElemNonDeclPool->put((DTDElementDecl*)elemDecl));
            } else if (fGrammarType == Grammar::SchemaGrammarType) 
            {
                elemDecl = new (fMemoryManager) SchemaElementDecl
                (
                    fPrefixBuf.getRawBuffer()
                    , nameRawBuf
                    , uriId
                    , SchemaElementDecl::Any
                    , Grammar::TOP_LEVEL_SCOPE
                    , fMemoryManager
                );
                elemDecl->setId(fSchemaElemNonDeclPool->put((void*)elemDecl->getBaseName(), uriId, currentScope, (SchemaElementDecl*)elemDecl));
            }
            wasAdded = true;
        }
    }

    //  We do something different here according to whether we found the
    //  element or not.
    if (wasAdded)
    {
        if (laxThisOne) {
            fValidate = false;
            fElemStack.setValidationFlag(fValidate);
        }
        else if (fValidate)
        {
            // If validating then emit an error

            // This is to tell the reuse Validator that this element was
            // faulted-in, was not an element in the grammar pool originally
            elemDecl->setCreateReason(XMLElementDecl::JustFaultIn);

            fValidator->emitError
            (
                XMLValid::ElementNotDefined
                , elemDecl->getFullName()
            );

            if(fGrammarType == Grammar::SchemaGrammarType)
            {
                ((SchemaElementDecl *)(elemDecl))->setValidationAttempted(PSVIDefs::FULL);
                ((SchemaElementDecl *)(elemDecl))->setValidity(PSVIDefs::INVALID);\
            }
        }
    }
    else
    {
        if(!laxBeforeElementFound && fGrammarType == Grammar::SchemaGrammarType) {
            if (fValidate) {
                ((SchemaElementDecl *)(elemDecl))->setValidationAttempted(PSVIDefs::FULL);
                ((SchemaElementDecl *)(elemDecl))->setValidity(PSVIDefs::VALID);
            }
        }

        // If its not marked declared and validating, then emit an error
        if (!elemDecl->isDeclared()) {
            if(elemDecl->getCreateReason() == XMLElementDecl::NoReason) {
                if(fGrammarType == Grammar::SchemaGrammarType) {
                    ((SchemaElementDecl *)(elemDecl))->setValidity(PSVIDefs::INVALID);
                    ((SchemaElementDecl *)(elemDecl))->setValidationAttempted(PSVIDefs::FULL);
                }
            }
            
            if (laxThisOne) {
                fValidate = false;
                fElemStack.setValidationFlag(fValidate);
            }
            else if (fValidate)
            {
                fValidator->emitError
                (
                    XMLValid::ElementNotDefined
                    , elemDecl->getFullName()
                );
            }
        }
       
        if (fGrammarType == Grammar::SchemaGrammarType) {
            ((SchemaElementDecl*)elemDecl)->setXsiComplexTypeInfo(0);
            ((SchemaElementDecl*)elemDecl)->setXsiSimpleTypeInfo(0);
        }
    }

    if(errorBeforeElementFound && fGrammarType == Grammar::SchemaGrammarType) {
        ((SchemaElementDecl *)(elemDecl))->setValidity(PSVIDefs::INVALID);
    }


    //  Now we can update the element stack to set the current element
    //  decl. We expanded the stack above, but couldn't store the element
    //  decl because we didn't know it yet.
    fElemStack.setElement(elemDecl, fReaderMgr.getCurrentReaderNum());
    fElemStack.setCurrentURI(uriId);

    if (isRoot)
    {
        fRootGrammar = fGrammar;
        fRootElemName = XMLString::replicate(qnameRawBuf);
    }

    if (fGrammarType == Grammar::SchemaGrammarType && fPSVIHandler)
    {
        fPSVIElemContext.fPreviousError = fPSVIElemContext.fErrorOccurred;
        fPSVIElemContext.fErrorOccurred = false;
        fPSVIElemContext.fElemDepth++;
        fPSVIElemContext.fValidationRoot = fRootElemName;

        // store current type info so we can restore it later
        fPSVIElemContext.fPreviousDV = fPSVIElemContext.fCurrentDV;
        fPSVIElemContext.fPreviousTypeInfo = fPSVIElemContext.fCurrentTypeInfo;

        if (elemDecl->isDeclared())
        {
            fPSVIElemContext.fNoneValidationDepth = fPSVIElemContext.fElemDepth;

            // update current type info
            fPSVIElemContext.fCurrentDV = ((SchemaElementDecl*) elemDecl)->getDatatypeValidator();
            fPSVIElemContext.fCurrentTypeInfo = ((SchemaElementDecl*) elemDecl)->getComplexTypeInfo();
        }
        else
        {
            fPSVIElemContext.fFullValidationDepth = fPSVIElemContext.fElemDepth;

            // update current type info
            fPSVIElemContext.fCurrentDV = 0;
            fPSVIElemContext.fCurrentTypeInfo = 0;

            if (isRoot && fValidate)
                fPSVIElemContext.fErrorOccurred = true;
        }
    }

    //  Validate the element
    if (fValidate)
    {
        fValidator->validateElement(elemDecl);
        if (fPSVIHandler && fValidator->handlesSchema())
        {
            if (((SchemaValidator*) fValidator)->getErrorOccurred())
                fPSVIElemContext.fErrorOccurred = true;

            // store current type info so we can restore it later
            fPSVIElemContext.fPreviousDV = fPSVIElemContext.fCurrentDV;
            fPSVIElemContext.fPreviousTypeInfo = fPSVIElemContext.fCurrentTypeInfo;

            if (elemDecl->isDeclared())
            {
                fPSVIElemContext.fCurrentDV = ((SchemaValidator*) fValidator)->getCurrentDatatypeValidator();
                fPSVIElemContext.fCurrentTypeInfo = ((SchemaValidator*) fValidator)->getCurrentTypeInfo();
            }
            else
            {
                fPSVIElemContext.fCurrentDV = 0;
                fPSVIElemContext.fCurrentTypeInfo = 0;
            }
        }
    }

    if (fGrammarType == Grammar::SchemaGrammarType) {

        ComplexTypeInfo* typeinfo = ((SchemaValidator*)fValidator)->getCurrentTypeInfo();
        if (typeinfo) {
            currentScope = typeinfo->getScopeDefined();

            // switch grammar if the typeinfo has a different grammar (happens when there is xsi:type)
            XMLCh* typeName = typeinfo->getTypeName();
            const XMLCh poundStr[] = {chPound, chNull};
            if (!XMLString::startsWith(typeName, poundStr)) {
                const int comma = XMLString::indexOf(typeName, chComma);
                if (comma > 0) {
                    XMLBuffer prefixBuf(comma+1, fMemoryManager);
                    prefixBuf.append(typeName, comma);
                    const XMLCh* uriStr = prefixBuf.getRawBuffer();

                    bool errorCondition = !switchGrammar(uriStr) && fValidate;
                    if (errorCondition && !laxThisOne)
                    {
                        fValidator->emitError
                        (
                            XMLValid::GrammarNotFound
                            , prefixBuf.getRawBuffer()
                        );                        
                        ((SchemaElementDecl *)(elemDecl))->setValidity(PSVIDefs::INVALID);                                    
                    }
                    else if(errorCondition) {                        
                        ((SchemaElementDecl *)(elemDecl))->setValidationAttempted(PSVIDefs::NONE);
                        ((SchemaElementDecl *)(elemDecl))->setValidity(PSVIDefs::UNKNOWN);
                    }
                }
            }
        }
        fElemStack.setCurrentScope(currentScope);

        // Set element next state
        if (elemDepth >= fElemStateSize) {
            resizeElemState();
        }

        fElemState[elemDepth] = 0;
    }

    fElemStack.setCurrentGrammar(fGrammar);

    //  If this is the first element and we are validating, check the root
    //  element.
    if (isRoot)
    {
        if (fValidate)
        {
            //  If a DocType exists, then check if it matches the root name there.
            if (fRootElemName && !XMLString::equals(qnameRawBuf, fRootElemName))
                fValidator->emitError(XMLValid::RootElemNotLikeDocType);

            //  Some validators may also want to check the root, call the
            //  XMLValidator::checkRootElement
            if (fValidatorFromUser && !fValidator->checkRootElement(elemDecl->getId()))
                fValidator->emitError(XMLValid::RootElemNotLikeDocType);

            if(fGrammarType == Grammar::SchemaGrammarType)
            {
                ((SchemaElementDecl *)(elemDecl))->setValidity(PSVIDefs::INVALID);
                if (getPSVIHandler())
                {
                    // REVISIT:                
                    // PSVIElement->setValidity(PSVIItem::VALIDITY_INVALID);
                }
            }
        }
    }
    else if (parentValidation)
    {
        //  If the element stack is not empty, then add this element as a
        //  child of the previous top element. If its empty, this is the root
        //  elem and is not the child of anything.
        fElemStack.addChild(elemDecl->getElementName(), true);
    }

    //  Now lets get the fAttrList filled in. This involves faulting in any
    //  defaulted and fixed attributes and normalizing the values of any that
    //  we got explicitly.
    //
    //  We update the attCount value with the total number of attributes, but
    //  it goes in with the number of values we got during the raw scan of
    //  explictly provided attrs above.
    attCount = buildAttList(*fRawAttrList, attCount, elemDecl, *fAttrList);

    // activate identity constraints
    if (fValidate && fGrammar && fGrammarType == Grammar::SchemaGrammarType) {

        unsigned int count = ((SchemaElementDecl*) elemDecl)->getIdentityConstraintCount();

        if (count || fMatcherStack->getMatcherCount()) {

            fValueStoreCache->startElement();
            fMatcherStack->pushContext();
            fValueStoreCache->initValueStoresFor((SchemaElementDecl*) elemDecl, (int) elemDepth);

            for (unsigned int i = 0; i < count; i++) {
                activateSelectorFor(((SchemaElementDecl*) elemDecl)->getIdentityConstraintAt(i), (int) elemDepth);
            }

            // call all active identity constraints
            count = fMatcherStack->getMatcherCount();

            for (unsigned int j = 0; j < count; j++) {
                XPathMatcher* matcher = fMatcherStack->getMatcherAt(j);
                matcher->startElement(*elemDecl, uriId, fPrefixBuf.getRawBuffer(), *fAttrList, attCount);
            }
        }
    }

    // Since the element may have default values, call start tag now regardless if it is empty or not
    // If we have a document handler, then tell it about this start tag
    if (fDocHandler)
    {
        fDocHandler->startElement
        (
            *elemDecl
            , uriId
            , fPrefixBuf.getRawBuffer()
            , *fAttrList
            , attCount
            , false
            , isRoot
        );
    }

    // if we have a PSVIHandler, now's the time to call
    // its handleAttributesPSVI method:
    if(fPSVIHandler)
    {
        QName *eName = elemDecl->getElementName();
        fPSVIHandler->handleAttributesPSVI
        (
            eName->getLocalPart()
            , fURIStringPool->getValueForId(eName->getURI())
            , fPSVIAttrList
        );
    }

    //  If empty, validate content right now if we are validating and then
    //  pop the element stack top. Else, we have to update the current stack
    //  top's namespace mapping elements.
    if (isEmpty)
    {
        // Pop the element stack back off since it'll never be used now
        fElemStack.popTop();

        DatatypeValidator* psviMemberType = 0;
        // If validating, then insure that its legal to have no content
        if (fValidate)
        {
            const int res = fValidator->checkContent(elemDecl, 0, 0);
            if (res >= 0)
            {
                fValidator->emitError
                (
                    XMLValid::ElementNotValidForContent
                    , elemDecl->getFullName()
                    , elemDecl->getFormattedContentModel()
                );
            }

            if (fGrammarType == Grammar::SchemaGrammarType) {

                if (((SchemaValidator*) fValidator)->getErrorOccurred())
                {
                    fPSVIElemContext.fErrorOccurred = true;
                    ((SchemaElementDecl *)(elemDecl))->setValidity(PSVIDefs::INVALID);
                }
                else if (fPSVIHandler)
                {
                    fPSVIElemContext.fIsSpecified = ((SchemaValidator*) fValidator)->getIsElemSpecified();
                    if (fPSVIElemContext.fCurrentDV->getType() == DatatypeValidator::Union)
                        psviMemberType = fValidationContext->getValidatingMemberType();
                }

                // call matchers and de-activate context
                int oldCount = fMatcherStack->getMatcherCount();

                if (oldCount || ((SchemaElementDecl*) elemDecl)->getIdentityConstraintCount()) {

                    for (int i = oldCount - 1; i >= 0; i--) {

                        XPathMatcher* matcher = fMatcherStack->getMatcherAt(i);
                        matcher->endElement(*elemDecl, fContent.getRawBuffer());
                    }

                    if (fMatcherStack->size() > 0) {
                        fMatcherStack->popContext();
                    }

                    // handle everything *but* keyref's.
                    int newCount = fMatcherStack->getMatcherCount();

                    for (int j = oldCount - 1; j >= newCount; j--) {

                        XPathMatcher* matcher = fMatcherStack->getMatcherAt(j);
                        IdentityConstraint* ic = matcher->getIdentityConstraint();

                        if (ic  && (ic->getType() != IdentityConstraint::KEYREF))
                            fValueStoreCache->transplant(ic, matcher->getInitialDepth());
                    }

                    // now handle keyref's...
                    for (int k = oldCount - 1; k >= newCount; k--) {

                        XPathMatcher* matcher = fMatcherStack->getMatcherAt(k);
                        IdentityConstraint* ic = matcher->getIdentityConstraint();

                        if (ic && (ic->getType() == IdentityConstraint::KEYREF)) {

                            ValueStore* values = fValueStoreCache->getValueStoreFor(ic, matcher->getInitialDepth());

                            if (values) { // nothing to do if nothing matched!
                                values->endDcocumentFragment(fValueStoreCache);
                            }
                        }
                    }

                    fValueStoreCache->endElement();
                }
            }
        }

        if (fGrammarType == Grammar::SchemaGrammarType)
        {
            if(!isRoot)
                ((SchemaElementDecl *)fElemStack.topElement()->fThisElement)->updateValidityFromElement(elemDecl, fGrammarType);

            if (fPSVIHandler)
            {
                endElementPSVI((SchemaElementDecl*)elemDecl, psviMemberType);
            }
        }

        // If we have a doc handler, tell it about the end tag
        if (fDocHandler)
        {
            fDocHandler->endElement
            (
                *elemDecl
                , uriId
                , isRoot
                , fPrefixBuf.getRawBuffer()
            );
        }

        // reset xsi:type ComplexTypeInfo
        if (fGrammarType == Grammar::SchemaGrammarType) {           
            ((SchemaElementDecl*)elemDecl)->reset();
            if (!isRoot)
                ((SchemaElementDecl*)(fElemStack.topElement()->fThisElement))->
                    setXsiComplexTypeInfo(((SchemaValidator*)fValidator)->getCurrentTypeInfo());
        }

        // If the elem stack is empty, then it was an empty root
        if (isRoot)
            gotData = false;
        else
        {
            // Restore the grammar
            fGrammar = fElemStack.getCurrentGrammar();
            fGrammarType = fGrammar->getGrammarType();
            if (fGrammarType == Grammar::SchemaGrammarType && !fValidator->handlesSchema()) {
                if (fValidatorFromUser)
                    ThrowXML(RuntimeException, XMLExcepts::Gen_NoSchemaValidator);
                else {
                    fValidator = fSchemaValidator;
                }
            }
            else if (fGrammarType == Grammar::DTDGrammarType && !fValidator->handlesDTD()) {
                if (fValidatorFromUser)
                    ThrowXML(RuntimeException, XMLExcepts::Gen_NoDTDValidator);
                else {
                    fValidator = fDTDValidator;
                }
            }

            fValidator->setGrammar(fGrammar);

            // Restore the validation flag
            fValidate = fElemStack.getValidationFlag();
        }
    }

    return true;
}


unsigned int
IGXMLScanner::resolveQName(const   XMLCh* const qName
                           ,       XMLBuffer&   prefixBuf
                           , const short        mode
                           ,       int&         prefixColonPos)
{
    //  Lets split out the qName into a URI and name buffer first. The URI
    //  can be empty.
    prefixColonPos = XMLString::indexOf(qName, chColon);
    if (prefixColonPos == -1)
    {
        //  Its all name with no prefix, so put the whole thing into the name
        //  buffer. Then map the empty string to a URI, since the empty string
        //  represents the default namespace. This will either return some
        //  explicit URI which the default namespace is mapped to, or the
        //  the default global namespace.
        bool unknown = false;

        prefixBuf.reset();
        return fElemStack.mapPrefixToURI(XMLUni::fgZeroLenString, (ElemStack::MapModes) mode, unknown);
    }
    else
    {
        //  Copy the chars up to but not including the colon into the prefix
        //  buffer.
        prefixBuf.set(qName, prefixColonPos);

        //  Watch for the special namespace prefixes. We always map these to
        //  special URIs. 'xml' gets mapped to the official URI that its defined
        //  to map to by the NS spec. xmlns gets mapped to a special place holder
        //  URI that we define (so that it maps to something checkable.)
        const XMLCh* prefixRawBuf = prefixBuf.getRawBuffer();
        if (XMLString::equals(prefixRawBuf, XMLUni::fgXMLNSString)) {

            // if this is an element, it is an error to have xmlns as prefix
            if (mode == ElemStack::Mode_Element)
                emitError(XMLErrs::NoXMLNSAsElementPrefix, qName);

            return fXMLNSNamespaceId;
        }
        else if (XMLString::equals(prefixRawBuf, XMLUni::fgXMLString)) {
            return  fXMLNamespaceId;
        }
        else
        {
            bool unknown = false;
            unsigned int uriId = fElemStack.mapPrefixToURI(prefixRawBuf, (ElemStack::MapModes) mode, unknown);

            if (unknown)
                emitError(XMLErrs::UnknownPrefix, prefixRawBuf);

            return uriId;
        }
    }
}

// ---------------------------------------------------------------------------
//  IGXMLScanner: Helper methos
// ---------------------------------------------------------------------------
void IGXMLScanner::resizeElemState() {

    unsigned int newSize = fElemStateSize * 2;
    unsigned int* newElemState = (unsigned int*) fMemoryManager->allocate
    (
        newSize * sizeof(unsigned int)
    ); //new unsigned int[newSize];

    // Copy the existing values
    unsigned int index = 0;