SGXMLScanner.cpp

        if (oldCount ||
            ((SchemaElementDecl*)topElem->fThisElement)->getIdentityConstraintCount()) {

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

                XPathMatcher* matcher = fMatcherStack->getMatcherAt(i);
                matcher->endElement(*(topElem->fThisElement), 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(!isRoot)
        ((SchemaElementDecl *)fElemStack.topElement()->fThisElement)->updateValidityFromElement(topElem->fThisElement, fGrammarType);

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


    // reset xsi:type ComplexTypeInfo
    ((SchemaElementDecl*)topElem->fThisElement)->reset();
    if (!isRoot)
        ((SchemaElementDecl*)(fElemStack.topElement()->fThisElement))->
            setXsiComplexTypeInfo(((SchemaValidator*)fValidator)->getCurrentTypeInfo());

    // If this was the root, then done with content
    gotData = !isRoot;

    if (gotData) {

        // Restore the grammar
        fGrammar = fElemStack.getCurrentGrammar();
        fGrammarType = fGrammar->getGrammarType();
        fValidator->setGrammar(fGrammar);

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


//  This method handles the high level logic of scanning the DOCType
//  declaration. This calls the DTDScanner and kicks off both the scanning of
//  the internal subset and the scanning of the external subset, if any.
//
//  When we get here the '<!DOCTYPE' part has already been scanned, which is
//  what told us that we had a doc type decl to parse.
void SGXMLScanner::scanDocTypeDecl()
{
    // Just skips over it
    // REVISIT: Should we issue a warning
    static const XMLCh doctypeIE[] =
    {
            chOpenSquare, chCloseAngle, chNull
    };
    XMLCh nextCh = fReaderMgr.skipUntilIn(doctypeIE);

    if (nextCh == chOpenSquare)
        fReaderMgr.skipPastChar(chCloseSquare);

    fReaderMgr.skipPastChar(chCloseAngle);
}

//  This method is called to scan a start tag when we are processing
//  namespaces. 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 SGXMLScanner::scanStartTag(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
    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
    );
    const bool gotAttrs = (attCount != 0);

    // 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) {

        SchemaElementDecl* tempElement = (SchemaElementDecl*) fElemStack.topElement()->fThisElement;
        SchemaElementDecl::ModelTypes modelType = tempElement->getModelType();

        if ((modelType == SchemaElementDecl::Mixed_Simple)
          ||  (modelType == SchemaElementDecl::Mixed_Complex)
          ||  (modelType == SchemaElementDecl::Children))
        {
            cm = tempElement->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
        && (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);

    //  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.
    XMLElementDecl* elemDecl = 0;
    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);

    if (uriId != fEmptyNamespaceId) {

        // Check in current grammar before switching if necessary
        elemDecl = fGrammar->getElemDecl
        (
          uriId
          , nameRawBuf
          , qnameRawBuf
          , currentScope
        );
        if(!elemDecl) 
        {
            // look in the list of undeclared elements, as would have been done
            // before we made grammars stateless:
            elemDecl = fElemNonDeclPool->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 = fElemNonDeclPool->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);
            elemDecl = new (fMemoryManager) SchemaElementDecl
            (
                fPrefixBuf.getRawBuffer()
                , nameRawBuf
                , uriId
                , SchemaElementDecl::Any
                , Grammar::TOP_LEVEL_SCOPE
                , fMemoryManager
            );
            elemDecl->setId(fElemNonDeclPool->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 unqualifed first
        elemDecl = fGrammar->getElemDecl
                   (
                      uriId
                    , nameRawBuf
                    , qnameRawBuf
                    , currentScope
                    );
        if(!elemDecl)
        {
            // look in the list of undeclared elements, as would have been done
            // before we made grammars stateless:
            elemDecl = fElemNonDeclPool->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 = fElemNonDeclPool->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.
                const XMLCh* uriStr = getURIText(orgGrammarUri);
                bool errorCondition = !switchGrammar(original_uriStr) && fValidate;
                if (errorCondition && !laxThisOne)
                {
                    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);
            elemDecl = new (fMemoryManager) SchemaElementDecl
            (
                fPrefixBuf.getRawBuffer()
                , nameRawBuf
                , uriId
                , SchemaElementDecl::Any
                , Grammar::TOP_LEVEL_SCOPE
                , fMemoryManager
            );
            elemDecl->setId(fElemNonDeclPool->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) {
            ((SchemaElementDecl *)(elemDecl))->setValidationAttempted(PSVIDefs::FULL);
        }

        // If validating then emit an error
        if (fValidate)
        {
            // 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()
            );
            ((SchemaElementDecl *)(elemDecl))->setValidity(PSVIDefs::INVALID);

        }
    }
    else
    {
        if(!laxBeforeElementFound) {
            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) {
                ((SchemaElementDecl *)(elemDecl))->setValidity(PSVIDefs::INVALID);
                ((SchemaElementDecl *)(elemDecl))->setValidationAttempted(PSVIDefs::FULL);
            }
            if (laxThisOne) {
                fValidate = false;
                fElemStack.setValidationFlag(fValidate);                
            }
            
            if (fValidate)
                {
                fValidator->emitError
                (
                    XMLValid::ElementNotDefined
                    , elemDecl->getFullName()
                );
            }
        }

        ((SchemaElementDecl*)elemDecl)->setXsiComplexTypeInfo(0);
        ((SchemaElementDecl*)elemDecl)->setXsiSimpleTypeInfo(0);
    }


    if(errorBeforeElementFound) {
        ((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;

    //  Validate the element
    if (fValidate)
        fValidator->validateElement(elemDecl);


    ComplexTypeInfo* typeinfo = ((SchemaElementDecl*)elemDecl)->getComplexTypeInfo();
    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)
        {
            //  Some validators may also want to check the root, call the
            //  XMLValidator::checkRootElement
            if (fValidatorFromUser && !fValidator->checkRootElement(elemDecl->getId())) {
                fValidator->emitError(XMLValid::RootElemNotLikeDocType);
                ((SchemaElementDecl *)(elemDecl))->setValidity(PSVIDefs::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) {

        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
        );
    } // may be where we output something...

    //  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();

        // 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()
                );
                ((SchemaElementDecl *)(elemDecl))->setValidity(PSVIDefs::INVALID);
            }

            // 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(!isRoot)
           ((SchemaElementDecl *)fElemStack.topElement()->fThisElement)->updateValidityFromElement(elemDecl, fGrammarType);

        // 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
        ((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();
            fValidator->setGrammar(fGrammar);

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

    return true;
}


unsigned int
SGXMLScanner::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;
        }
    }
}

// ---------------------------------------------------------------------------
//  SGXMLScanner: IC activation methos
// ---------------------------------------------------------------------------
void SGXMLScanner::activateSelectorFor(IdentityConstraint* const ic, const int initialDepth) {

    IC_Selector* selector = ic->getSelector();

    if (!selector)
        return;

    XPathMatcher* matcher = selector->createMatcher
    (
        fFieldActivator
        , initialDepth
        , fMemoryManager
    );

    fMatcherStack->addMatcher(matcher);
    matcher->startDocumentFragment();
}

// ---------------------------------------------------------------------------
//  SGXMLScanner: Grammar preparsing
// ---------------------------------------------------------------------------
Grammar* SGXMLScanner::loadGrammar(const   InputSource& src
                                   , const short        grammarType
                                   , const bool         toCache)
{
    Grammar* loadedGrammar = 0;

    try
    {
        fGrammarResolver->cacheGrammarFromParse(false);
        fGrammarResolver->useCachedGrammarInParse(false);
        fRootGrammar = 0;

        if (fValScheme == Val_Auto) {
            fValidate = true;
        }

        // Reset some status flags
        fInException = false;
        fStandalone = false;
        fErrorCount = 0;
        fHasNoDTD = true;
        fSeeXsi = false;

        if (grammarType == Grammar::SchemaGrammarType) {
            loadedGrammar = loadXMLSchemaGrammar(src, toCache);
        }

        // Reset the reader manager to close all files, sockets, etc...
        fReaderMgr.reset();
    }
    //  NOTE:
    //
    //  In all of the error processing below, the emitError() call MUST come
    //  before the flush of the reader mgr, or it will fail because it tries
    //  to find out the position in the XML source of the error.
    catch(const XMLErrs::Codes)
    {
        // This is a 'first fatal error' type exit, so reset and fall through
        fReaderMgr.reset();
    }
    catch(const XMLValid::Codes)
    {
        // This is a 'first fatal error' type exit, so reset and fall through
        fReaderMgr.reset();

    }
    catch(const XMLException& excToCatch)
    {
        //  Emit the error and catch any user exception thrown from here. Make
        //  sure in all cases we flush the reader manager.
        fInException = true;
        try
        {
            if (excToCatch.getErrorType() == XMLErrorReporter::ErrType_Warning)
                emitError
                (
                    XMLErrs::DisplayErrorMessage
                    , excToCatch.getMessage()
                );
            else if (excToCatch.getErrorType() >= XMLErrorReporter::ErrType_Fatal)
                emitError
                (
                    XMLErrs::XMLException_Fatal
                    , excToCatch.getType()
                    , excToCatch.getMessage()
                );
            else
                emitError
                (
                    XMLErrs::XMLException_Error
                    , excToCatch.getType()
                    , excToCatch.getMessage()
                );
        }
        catch(const OutOfMemoryException&)
        {
            throw;
        }
        catch(...)
        {
            // Flush the reader manager and rethrow user's error
            fReaderMgr.reset();
            throw;
        }

        // If it returned, then reset the reader manager and fall through
        fReaderMgr.reset();
    }
    catch(const OutOfMemoryException&)
    {
        throw;
    }
    catch(...)
    {
        // Reset and rethrow
        fReaderMgr.reset();
        throw;
    }

    return loadedGrammar;
}

// ---------------------------------------------------------------------------
//  SGXMLScanner: Private helper methods
// ---------------------------------------------------------------------------
//  This method handles the common initialization, to avoid having to do
//  it redundantly in multiple constructors.
void SGXMLScanner::commonInit()
{
    //  Create the element state array
    fElemState = (unsigned int*) fMemoryManager->allocate
    (
        fElemStateSize * sizeof(unsigned int)
    ); //new unsigned int[fElemStateSize];

    //  And we need one for the raw attribute scan. This just stores key/
    //  value string pairs (prior to any processing.)
    fRawAttrList = new (fMemoryManager) RefVectorOf<KVStringPair>(32, true, fMemoryManager);

    // Create dummy schema grammar
    fSchemaGrammar = new (fGrammarPoolMemoryManager) SchemaGrammar(fGrammarPoolMemoryManager);

    //  Create the Validator and init them
    fSchemaValidator = new (fMemoryManager) SchemaValidator(0, fMemoryManager);
    initValidator(fSchemaValidator);

    // Create IdentityConstraint info
    fMatcherStack = new (fMemoryManager) XPathMatcherStack(fMemoryManager);
    fValueStoreCache = new (fMemoryManager) ValueStoreCache(fMemoryManager);
    fFieldActivator = new (fMemoryManager) FieldActivator(fValueStoreCache, fMatcherStack, fMemoryManager);
    fValueStoreCache->setScanner(this);

    //  Add the default entity entries for the character refs that must always
    //  be present.
    fEntityTable = new (fMemoryManager) ValueHashTableOf<XMLCh>(11, fMemoryManager);
    fEntityTable->put((void*) XMLUni::fgAmp, chAmpersand);
    fEntityTable->put((void*) XMLUni::fgLT, chOpenAngle);
    fEntityTable->put((void*) XMLUni::fgGT, chCloseAngle);
    fEntityTable->put((void*) XMLUni::fgQuot, chDoubleQuote);
    fEntityTable->put((void*) XMLUni::fgApos, chSingleQuote);
    fElemNonDeclPool = new (fMemoryManager) RefHash3KeysIdPool<SchemaElementDecl>(29, true, 128, fMemoryManager);
}

void SGXMLScanner::cleanUp()
{
    fMemoryManager->deallocate(fElemState); //delete [] fElemState;
    delete fSchemaGrammar;
    delete fEntityTable;
    delete fRawAttrList;
    delete fSchemaValidator;
    delete fFieldActivator;
    delete fMatcherStack;
    delete fValueStoreCache;
    delete fElemNonDeclPool;
}

void SGXMLScanner::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;
    for (; index < fElemStateSize; index++)
        newElemState[index] = fElemState[index];

    for (; index < newSize; index++)
        newElemState[index] = 0;

    // Delete the old array and udpate our members
    fMemoryManager->deallocate(fElemState); //delete [] fElemState;
    fElemState = newElemState;
    fElemStateSize = newSize;
}