SGXMLScanner.cpp

                                // the attribute should be qualified
                                fValidator->emitError
                                (
                                    XMLValid::AttributeNotUnQualified
                                    , attDef->getFullName()
                                );
                            }
                        }
                    }
                }
            }

            //  Find this attribute within the parent element. We pass both
            //  the uriID/name and the raw QName buffer, since we don't know
            //  how the derived validator and its elements store attributes.
            bool wasAdded = false;
            if (!attDef) {
                attDef = elemDecl->findAttr
                (
                    curPair->getKey()
                    , uriId
                    , suffPtr
                    , prefPtr
                    , XMLElementDecl::AddIfNotFound
                    , wasAdded
                );
            }

            if (wasAdded)
            {
                // This is to tell the Validator that this attribute was
                // faulted-in, was not an attribute in the attdef originally
                attDef->setCreateReason(XMLAttDef::JustFaultIn);
            }

            if (fValidate && !attDefForWildCard && !skipThisOne && !laxThisOne &&
                attDef->getCreateReason() == XMLAttDef::JustFaultIn && !attDef->getProvided())
            {
                //
                //  Its not valid for this element, so issue an error if we are
                //  validating.
                //
                XMLBufBid bbMsg(&fBufMgr);
                XMLBuffer& bufMsg = bbMsg.getBuffer();
                if (uriId != fEmptyNamespaceId) {
                    XMLBufBid bbURI(&fBufMgr);
                    XMLBuffer& bufURI = bbURI.getBuffer();

                    getURIText(uriId, bufURI);

                    bufMsg.append(chOpenCurly);
                    bufMsg.append(bufURI.getRawBuffer());
                    bufMsg.append(chCloseCurly);
                }
                bufMsg.append(suffPtr);
                fValidator->emitError
                (
                    XMLValid::AttNotDefinedForElement
                    , bufMsg.getRawBuffer()
                    , elemDecl->getFullName()
                );
            }

            //  If its already provided, then there are more than one of
            //  this attribute in this start tag, so emit an error.
            if (attDef->getProvided())
            {
                emitError
                (
                    XMLErrs::AttrAlreadyUsedInSTag
                    , attDef->getFullName()
                    , elemDecl->getFullName()
                );
            }
            else
            {
                attDef->setProvided(true);
            }

            //  Now normalize the raw value since we have the attribute type. We
            //  don't care about the return status here. If it failed, an error
            //  was issued, which is all we care about.
            if (attDefForWildCard) {
                normalizeAttValue
                (
                    attDefForWildCard
                    , curPair->getValue()
                    , normBuf
                );

                //  If we found an attdef for this one, then lets validate it.
                if (fNormalizeData)
                {
                    // normalize the attribute according to schema whitespace facet
                    XMLBufBid bbtemp(&fBufMgr);
                    XMLBuffer& tempBuf = bbtemp.getBuffer();

                    DatatypeValidator* tempDV = ((SchemaAttDef*) attDefForWildCard)->getDatatypeValidator();
                    ((SchemaValidator*) fValidator)->normalizeWhiteSpace(tempDV, normBuf.getRawBuffer(), tempBuf);
                    normBuf.set(tempBuf.getRawBuffer());
                }

                if (fValidate && !skipThisOne) {
                    fValidator->validateAttrValue
                    (
                        attDefForWildCard
                        , normBuf.getRawBuffer()
                        , false
                        , elemDecl
                    );
                }

                // Save the type for later use
                attType = attDefForWildCard->getType();
            }
            else {
                normalizeAttValue
                (
                    attDef
                    , curPair->getValue()
                    , normBuf
                );

                //  If we found an attdef for this one, then lets validate it.
                if (attDef->getCreateReason() != XMLAttDef::JustFaultIn)
                {
                    if (fNormalizeData && (fGrammarType == Grammar::SchemaGrammarType))
                    {
                        // normalize the attribute according to schema whitespace facet
                        XMLBufBid bbtemp(&fBufMgr);
                        XMLBuffer& tempBuf = bbtemp.getBuffer();

                        DatatypeValidator* tempDV = ((SchemaAttDef*) attDef)->getDatatypeValidator();
                        ((SchemaValidator*) fValidator)->normalizeWhiteSpace(tempDV, normBuf.getRawBuffer(), tempBuf);
                        normBuf.set(tempBuf.getRawBuffer());
                    }

                    if (fValidate && !skipThisOne)
                    {
                        fValidator->validateAttrValue
                        (
                            attDef
                            , normBuf.getRawBuffer()
                            , false
                            , elemDecl
                        );
                    }
                }

                // Save the type for later use
                attType = attDef->getType();
            }
        }
        else
        {
            // Just normalize as CDATA
            attType = XMLAttDef::CData;
            normalizeAttRawValue
            (
                curPair->getKey()
                , curPair->getValue()
                , normBuf
            );
        }

        //  Add this attribute to the attribute list that we use to pass them
        //  to the handler. We reuse its existing elements but expand it as
        //  required.
        XMLAttr* curAttr;
        if (retCount >= curAttListSize)
        {
            curAttr = new XMLAttr
            (
                uriId
                , suffPtr
                , prefPtr
                , normBuf.getRawBuffer()
                , attType
                , true
            );
            toFill.addElement(curAttr);
        }
        else
        {
            curAttr = toFill.elementAt(retCount);
            curAttr->set
            (
                uriId
                , suffPtr
                , prefPtr
                , normBuf.getRawBuffer()
                , attType
            );
            curAttr->setSpecified(true);
        }

        // Bump the count of attrs in the list
        retCount++;
    }

    //  Now, if there are any attributes declared by this element, let's
    //  go through them and make sure that any required ones are provided,
    //  and fault in any fixed ones and defaulted ones that are not provided
    //  literally.
    if (hasDefs)
    {
        // Check after all specified attrs are scanned
        // (1) report error for REQUIRED attrs that are missing (V_TAGc)
        // (2) add default attrs if missing (FIXED and NOT_FIXED)
        XMLAttDefList& attDefList = elemDecl->getAttDefList();
        while (attDefList.hasMoreElements())
        {
            // Get the current att def, for convenience and its def type
            const XMLAttDef& curDef = attDefList.nextElement();
            const XMLAttDef::DefAttTypes defType = curDef.getDefaultType();

            if (!curDef.getProvided())
            {
                //the attributes is not provided
                if (fValidate)
                {
                    // If we are validating and its required, then an error
                    if ((defType == XMLAttDef::Required) ||
                        (defType == XMLAttDef::Required_And_Fixed)  )

                    {
                        fValidator->emitError
                        (
                            XMLValid::RequiredAttrNotProvided
                            , curDef.getFullName()
                        );
                    }
                    else if ((defType == XMLAttDef::Default) ||
                             (defType == XMLAttDef::Fixed)  )
                    {
                        if (fStandalone && curDef.isExternal())
                        {
                            // XML 1.0 Section 2.9
                            // Document is standalone, so attributes must not be defaulted.
                            fValidator->emitError(XMLValid::NoDefAttForStandalone, curDef.getFullName(), elemDecl->getFullName());
                        }
                    }
                }

                //  Fault in the value if needed, and bump the att count.
                //  We have to
                if ((defType == XMLAttDef::Default)
                ||  (defType == XMLAttDef::Fixed))
                {
                    // Let the validator pass judgement on the attribute value
                    if (fValidate)
                    {
                        fValidator->validateAttrValue
                        (
                            &curDef
                            , curDef.getValue()
                            , false
                            , elemDecl
                        );
                    }

                    XMLAttr* curAtt;
                    if (retCount >= curAttListSize)
                    {
                        curAtt = new XMLAttr;
                        fValidator->faultInAttr(*curAtt, curDef);
                        fAttrList->addElement(curAtt);
                    }
                    else
                    {
                        curAtt = fAttrList->elementAt(retCount);
                        fValidator->faultInAttr(*curAtt, curDef);
                    }

                    // Indicate it was not explicitly specified and bump count
                    curAtt->setSpecified(false);
                    retCount++;
                }
            }
            else
            {
                //attribute is provided
                // (schema) report error for PROHIBITED attrs that are present (V_TAGc)
                if (defType == XMLAttDef::Prohibited && fValidate)
                    fValidator->emitError
                    (
                        XMLValid::ProhibitedAttributePresent
                        , curDef.getFullName()
                    );
            }
        }
    }
    return retCount;
}


//  This method will take a raw attribute value and normalize it according to
//  the rules of the attribute type. It will put the resulting value into the
//  passed buffer.
//
//  This code assumes that escaped characters in the original value (via char
//  refs) are prefixed by a 0xFFFF character. This is because some characters
//  are legal if escaped only. And some escape chars are not subject to
//  normalization rules.
bool SGXMLScanner::normalizeAttValue( const   XMLAttDef* const    attDef
                                      , const XMLCh* const        value
                                      ,       XMLBuffer&          toFill)
{
    // A simple state value for a whitespace processing state machine
    enum States
    {
        InWhitespace
        , InContent
    };

    // Get the type and name
    const XMLAttDef::AttTypes type = attDef->getType();
    const XMLCh* const attrName = attDef->getFullName();

    // Assume its going to go fine, and empty the target buffer in preperation
    bool retVal = true;
    toFill.reset();

    // Get attribute def - to check to see if it's declared externally or not
    bool  isAttExternal = attDef->isExternal();

    //  Loop through the chars of the source value and normalize it according
    //  to the type.
    States curState = InContent;
    bool escaped;
    bool firstNonWS = false;
    XMLCh nextCh;
    const XMLCh* srcPtr = value;
    while (*srcPtr)
    {
        //  Get the next character from the source. We have to watch for
        //  escaped characters (which are indicated by a 0xFFFF value followed
        //  by the char that was escaped.)
        nextCh = *srcPtr;
        escaped = (nextCh == 0xFFFF);
        if (escaped)
            nextCh = *++srcPtr;

        //  If its not escaped, then make sure its not a < character, which is
        //  not allowed in attribute values.
        if (!escaped && (*srcPtr == chOpenAngle))
        {
            emitError(XMLErrs::BracketInAttrValue, attrName);
            retVal = false;
        }

        if (type == XMLAttDef::CData || type > XMLAttDef::Notation)
        {
            if (!escaped)
            {
                if ((nextCh == 0x09) || (nextCh == 0x0A) || (nextCh == 0x0D))
                {
                    // Check Validity Constraint for Standalone document declaration
                    // XML 1.0, Section 2.9
                    if (fStandalone && fValidate && isAttExternal)
                    {
                         // Can't have a standalone document declaration of "yes" if  attribute
                         // values are subject to normalisation
                         fValidator->emitError(XMLValid::NoAttNormForStandalone, attrName);
                    }
                    nextCh = chSpace;
                }
            }
        }
        else
        {
            if (curState == InWhitespace)
            {
                if (!fReaderMgr.getCurrentReader()->isWhitespace(nextCh))
                {
                    if (firstNonWS)
                        toFill.append(chSpace);
                    curState = InContent;
                    firstNonWS = true;
                }
                else
                {
                    srcPtr++;
                    continue;
                }
            }
            else if (curState == InContent)
            {
                if (fReaderMgr.getCurrentReader()->isWhitespace(nextCh))
                {
                    curState = InWhitespace;
                    srcPtr++;

                    // Check Validity Constraint for Standalone document declaration
                    // XML 1.0, Section 2.9
                    if (fStandalone && fValidate && isAttExternal)
                    {
                        if (!firstNonWS || (nextCh != chSpace) || (!*srcPtr) || fReaderMgr.getCurrentReader()->isWhitespace(*srcPtr))
                        {
                             // Can't have a standalone document declaration of "yes" if  attribute
                             // values are subject to normalisation
                             fValidator->emitError(XMLValid::NoAttNormForStandalone, attrName);
                        }
                    }
                    continue;
                }
                firstNonWS = true;
            }
        }

        // Add this char to the target buffer
        toFill.append(nextCh);

        // And move up to the next character in the source
        srcPtr++;
    }
    return retVal;
}

//  This method will just normalize the input value as CDATA without
//  any standalone checking.
bool SGXMLScanner::normalizeAttRawValue( const   XMLCh* const        attrName
                                      , const XMLCh* const        value
                                      ,       XMLBuffer&          toFill)
{
    // Assume its going to go fine, and empty the target buffer in preperation
    bool retVal = true;
    toFill.reset();

    //  Loop through the chars of the source value and normalize it according
    //  to the type.
    bool escaped;
    XMLCh nextCh;
    const XMLCh* srcPtr = value;
    while (*srcPtr)
    {
        //  Get the next character from the source. We have to watch for
        //  escaped characters (which are indicated by a 0xFFFF value followed
        //  by the char that was escaped.)
        nextCh = *srcPtr;
        escaped = (nextCh == 0xFFFF);
        if (escaped)
            nextCh = *++srcPtr;

        //  If its not escaped, then make sure its not a < character, which is
        //  not allowed in attribute values.
        if (!escaped && (*srcPtr == chOpenAngle))
        {
            emitError(XMLErrs::BracketInAttrValue, attrName);
            retVal = false;
        }

        if (!escaped)
        {
            //  NOTE: Yes this is a little redundant in that a 0x20 is
            //  replaced with an 0x20. But its faster to do this (I think)
            //  than checking for 9, A, and D separately.
            if (fReaderMgr.getCurrentReader()->isWhitespace(nextCh))
                nextCh = chSpace;
        }

        // Add this char to the target buffer
        toFill.append(nextCh);

        // And move up to the next character in the source
        srcPtr++;
    }
    return retVal;
}

unsigned int
SGXMLScanner::resolvePrefix(  const   XMLCh* const        prefix
                              , const ElemStack::MapModes mode)
{
    //  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.)
    if (XMLString::equals(prefix, XMLUni::fgXMLNSString))
        return fXMLNSNamespaceId;
    else if (XMLString::equals(prefix, XMLUni::fgXMLString))
        return fXMLNamespaceId;

    //  Ask the element stack to search up itself for a mapping for the
    //  passed prefix.
    bool unknown;
    unsigned int uriId = fElemStack.mapPrefixToURI(prefix, mode, unknown);

    // If it was unknown, then the URI was faked in but we have to issue an error
    if (unknown)
        emitError(XMLErrs::UnknownPrefix, prefix);

    return uriId;
}

unsigned int
SGXMLScanner::resolvePrefix(  const   XMLCh* const        prefix
                              ,       XMLBuffer&          bufToFill
                              , const ElemStack::MapModes mode)
{
    //  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.)
    if (XMLString::equals(prefix, XMLUni::fgXMLNSString))
        return fXMLNSNamespaceId;
    else if (XMLString::equals(prefix, XMLUni::fgXMLString))
        return fXMLNamespaceId;

    //  Ask the element stack to search up itself for a mapping for the
    //  passed prefix.
    bool unknown;
    unsigned int uriId = fElemStack.mapPrefixToURI(prefix, mode, unknown);

    // If it was unknown, then the URI was faked in but we have to issue an error
    if (unknown)
        emitError(XMLErrs::UnknownPrefix, prefix);

    getURIText(uriId,bufToFill);

    return uriId;
}


//  This method will reset the scanner data structures, and related plugged
//  in stuff, for a new scan session. We get the input source for the primary
//  XML entity, create the reader for it, and push it on the stack so that
//  upon successful return from here we are ready to go.
void SGXMLScanner::scanReset(const InputSource& src)
{

    //  This call implicitly tells us that we are going to reuse the scanner
    //  if it was previously used. So tell the validator to reset itself.
    //
    //  But, if the fUseCacheGrammar flag is set, then don't reset it.
    //
    //  NOTE:   The ReaderMgr is flushed on the way out, because that is
    //          required to insure that files are closed.
    fGrammarResolver->cacheGrammarFromParse(fToCacheGrammar);
    fGrammarResolver->useCachedGrammarInParse(fUseCachedGrammar);

    fGrammar = fSchemaGrammar;
    fGrammarType = Grammar::DTDGrammarType;
    fRootGrammar = 0;

    fValidator->setGrammar(fGrammar);
    if (fValidatorFromUser) {

        ((SchemaValidator*) fValidator)->setErrorReporter(fErrorReporter);
        ((SchemaValidator*) fValidator)->setGrammarResolver(fGrammarResolver);
        ((SchemaValidator*) fValidator)->setExitOnFirstFatal(fExitOnFirstFatal);
    }

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

    //  And for all installed handlers, send reset events. This gives them
    //  a chance to flush any cached data.
    if (fDocHandler)
        fDocHandler->resetDocument();
    if (fEntityHandler)
        fEntityHandler->resetEntities();
    if (fErrorReporter)
        fErrorReporter->resetErrors();

    // Clear out the id reference list
    fIDRefList->removeAll();

    // Reset IdentityConstraints
    fValueStoreCache->startDocument();
    fMatcherStack->clear();

    //  Reset the element stack, and give it the latest ids for the special
    //  URIs it has to know about.
    fElemStack.reset
    (
        fEmptyNamespaceId
        , fUnknownNamespaceId
        , fXMLNamespaceId
        , fXMLNSNamespaceId
    );

    if (!fSchemaNamespaceId)
        fSchemaNamespaceId  = fURIStringPool->addOrFind(SchemaSymbols::fgURI_XSI);

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

    // Reset the validators
    fSchemaValidator->reset();
    fSchemaValidator->setErrorReporter(fErrorReporter);
    fSchemaValidator->setExitOnFirstFatal(fExitOnFirstFatal);
    fSchemaValidator->setGrammarResolver(fGrammarResolver);
    if (fValidatorFromUser)
        fValidator->reset();

    //  Handle the creation of the XML reader object for this input source.
    //  This will provide us with transcoding and basic lexing services.
    XMLReader* newReader = fReaderMgr.createReader
    (
        src
        , true
        , XMLReader::RefFrom_NonLiteral
        , XMLReader::Type_General
        , XMLReader::Source_External
        , fCalculateSrcOfs
    );

    if (!newReader) {
        if (src.getIssueFatalErrorIfNotFound())
            ThrowXML1(RuntimeException, XMLExcepts::Scan_CouldNotOpenSource, src.getSystemId());
        else
            ThrowXML1(RuntimeException, XMLExcepts::Scan_CouldNotOpenSource_Warning, src.getSystemId());
    }

    // Push this read onto the reader manager
    fReaderMgr.pushReader(newReader, 0);
}


//  This method is called between markup in content. It scans for character
//  data that is sent to the document handler. It watches for any markup
//  characters that would indicate that the character data has ended. It also
//  handles expansion of general and character entities.
//
//  sendData() is a local static helper for this method which handles some
//  code that must be done in three different places here.
void SGXMLScanner::sendCharData(XMLBuffer& toSend)
{
    // If no data in the buffer, then nothing to do
    if (toSend.isEmpty())
        return;

    //  We do different things according to whether we are validating or
    //  not. If not, its always just characters; else, it depends on the
    //  current element's content model.
    if (fValidate)
    {
        // Get the raw data we need for the callback
        const XMLCh* const rawBuf = toSend.getRawBuffer();
        const unsigned int len = toSend.getLen();

        // And see if the current element is a 'Children' style content model
        const ElemStack::StackElem* topElem = fElemStack.topElement();

        // Get the character data opts for the current element
        XMLElementDecl::CharDataOpts charOpts = topElem->fThisElement->getCharDataOpts();

        if (charOpts == XMLElementDecl::NoCharData)
        {
            // They definitely cannot handle any type of char data
            fValidator->emitError(XMLValid::NoCharDataInCM);
        }
        else if (fReaderMgr.getCurrentReader()->isAllSpaces(rawBuf, len))
        {
            //  Its all spaces. So, if they can take spaces, then send it
            //  as ignorable whitespace. If they can handle any char data
            //  send it as characters.
            if (charOpts == XMLElementDecl::SpacesOk) {
                if (fDocHandler)
                    fDocHandler->ignorableWhitespace(rawBuf, len, false);
            }
            else if (charOpts == XMLElementDecl::AllCharData)
            {
                // The normalized data can only be as large as the
                // original size, so this will avoid allocating way
                // too much or too little memory.
                XMLBuffer toFill(len+1);
                toFill.set(rawBuf);

                if (fNormalizeData) {
                    // normalize the character according to schema whitespace facet
                    XMLBufBid bbtemp(&fBufMgr);
                    XMLBuffer& tempBuf = bbtemp.getBuffer();

                    DatatypeValidator* tempDV = ((SchemaElementDecl*) topElem->fThisElement)->getDatatypeValidator();
                    ((SchemaValidator*) fValidator)->normalizeWhiteSpace(tempDV, toFill.getRawBuffer(),  tempBuf);
                    toFill.set(tempBuf.getRawBuffer());
                }

                // tell the schema validation about the character data for checkContent later
                ((SchemaValidator*) fValidator)->setDatatypeBuffer(toFill.getRawBuffer());

                // call all active identity constraints
                if (fMatcherStack->getMatcherCount())
                    fContent.append(toFill.getRawBuffer(), toFill.getLen());

                if (fDocHandler)
                    fDocHandler->docCharacters(toFill.getRawBuffer(), toFill.getLen(), false);
            }
        }
        else
        {
            //  If they can take any char data, then send it. Otherwise, they
            //  can only handle whitespace and can't handle this stuff so
            //  issue an error.
            if (charOpts == XMLElementDecl::AllCharData)
            {
                // The normalized data can only be as large as the
                // original size, so this will avoid allocating way
                // too much or too little memory.
                XMLBuffer toFill(len+1);
                toFill.set(rawBuf);

                if (fNormalizeData) {
                    // normalize the character according to schema whitespace facet
                    XMLBufBid bbtemp(&fBufMgr);
                    XMLBuffer& tempBuf = bbtemp.getBuffer();

                    DatatypeValidator* tempDV = ((SchemaElementDecl*) topElem->fThisElement)->getDatatypeValidator();
                    ((SchemaValidator*) fValidator)->normalizeWhiteSpace(tempDV, toFill.getRawBuffer(),  tempBuf);
                    toFill.set(tempBuf.getRawBuffer());
                }

                // tell the schema validation about the character data for checkContent later
                ((SchemaValidator*) fValidator)->setDatatypeBuffer(toFill.getRawBuffer());

                // call all active identity constraints
                if (fMatcherStack->getMatcherCount())
                    fContent.append(toFill.getRawBuffer(), toFill.getLen());

                if (fDocHandler)
                    fDocHandler->docCharacters(toFill.getRawBuffer(), toFill.getLen(), false);
            }
            else
            {
                fValidator->emitError(XMLValid::NoCharDataInCM);
            }
        }
    }
    else
    {
        // call all active identity constraints
        if (fMatcherStack->getMatcherCount())
            fContent.append(toSend.getRawBuffer(), toSend.getLen());

        // Always assume its just char data if not validating
        if (fDocHandler)
            fDocHandler->docCharacters(toSend.getRawBuffer(), toSend.getLen(), false);
    }

    // Reset buffer
    toSend.reset();
}



//  This method is called with a key/value string pair that represents an
//  xmlns="yyy" or xmlns:xxx="yyy" attribute. This method will update the
//  current top of the element stack based on this data. We know that when
//  we get here, that it is one of these forms, so we don't bother confirming
//  it.
//
//  But we have to ensure
//      1. xxx is not xmlns
//      2. if xxx is xml, then yyy must match XMLUni::fgXMLURIName, and vice versa
//      3. yyy is not XMLUni::fgXMLNSURIName
//      4. if xxx is not null, then yyy cannot be an empty string.
void SGXMLScanner::updateNSMap(const  XMLCh* const    attrName
                              , const XMLCh* const    attrValue)
{
    // We need a buffer to normalize the attribute value into
    XMLBufBid bbNormal(&fBufMgr);
    XMLBuffer& normalBuf = bbNormal.getBuffer();

    //  Normalize the value into the passed buffer. In this case, we don't
    //  care about the return value. An error was issued for the error, which
    //  is all we care about here.
    normalizeAttRawValue(attrName, attrValue, normalBuf);
    XMLCh* namespaceURI = normalBuf.getRawBuffer();

    //  We either have the default prefix (""), or we point it into the attr
    //  name parameter. Note that the xmlns is not the prefix we care about
    //  here. To us, the 'prefix' is really the local part of the attrName
    //  parameter.
    //
    //  Check 1. xxx is not xmlns
    //        2. if xxx is xml, then yyy must match XMLUni::fgXMLURIName, and vice versa
    //        3. yyy is not XMLUni::fgXMLNSURIName
    //        4. if xxx is not null, then yyy cannot be an empty string.
    const XMLCh* prefPtr = XMLUni::fgZeroLenString;
    const int colonOfs = XMLString::indexOf(attrName, chColon);
    if (colonOfs != -1) {
        prefPtr = &attrName[colonOfs + 1];

        if (XMLString::equals(prefPtr, XMLUni::fgXMLNSString))
            emitError(XMLErrs::NoUseOfxmlnsAsPrefix);
        else if (XMLString::equals(prefPtr, XMLUni::fgXMLString)) {
            if (!XMLString::equals(namespaceURI, XMLUni::fgXMLURIName))
                emitError(XMLErrs::PrefixXMLNotMatchXMLURI);
        }

        if (!namespaceURI || !*namespaceURI)
            emitError(XMLErrs::NoEmptyStrNamespace, attrName);
    }

    if (XMLString::equals(namespaceURI, XMLUni::fgXMLNSURIName))
        emitError(XMLErrs::NoUseOfxmlnsURI);
    else if (XMLString::equals(namespaceURI, XMLUni::fgXMLURIName)) {
        if (!XMLString::equals(prefPtr, XMLUni::fgXMLString))
            emitError(XMLErrs::XMLURINotMatchXMLPrefix);
    }

    //  Ok, we have to get the unique id for the attribute value, which is the
    //  URI that this value should be mapped to. The validator has the
    //  namespace string pool, so we ask him to find or add this new one. Then
    //  we ask the element stack to add this prefix to URI Id mapping.
    fElemStack.addPrefix
    (
        prefPtr
        , fURIStringPool->addOrFind(namespaceURI)
    );
}

void SGXMLScanner::scanRawAttrListforNameSpaces(const RefVectorOf<KVStringPair>* theRawAttrList, int attCount)
{
    //  Make an initial pass through the list and find any xmlns attributes or
    //  schema attributes.
    //  When we find one, send it off to be used to update the element stack's
    //  namespace mappings.
    int index = 0;
    for (index = 0; index < attCount; index++)
    {
        // each attribute has the prefix:suffix="value"
        const KVStringPair* curPair = fRawAttrList->elementAt(index);
        const XMLCh* rawPtr = curPair->getKey();

        //  If either the key begins with "xmlns:" or its just plain
        //  "xmlns", then use it to update the map.
        if (!XMLString::compareNString(rawPtr, XMLUni::fgXMLNSColonString, 6)
        ||  XMLString::equals(rawPtr, XMLUni::fgXMLNSString))
        {
            const XMLCh* valuePtr = curPair->getValue();

            updateNSMap(rawPtr, valuePtr);

            // if the schema URI is seen in the the valuePtr, set the boolean seeXsi
            if (XMLString::equals(valuePtr, SchemaSymbols::fgURI_XSI)) {
                fSeeXsi = true;
            }
        }
    }

    // walk through the list again to deal with "xsi:...."
    if (fSeeXsi)
    {
        //  Schema Xsi Type yyyy (e.g. xsi:type="yyyyy")
        XMLBufBid bbXsi(&fBufMgr);
        XMLBuffer& fXsiType = bbXsi.getBuffer();

        QName attName;

        for (index = 0; index < attCount; index++)
        {
            // each attribute has the prefix:suffix="value"
            const KVStringPair* curPair = fRawAttrList->elementAt(index);
            const XMLCh* rawPtr = curPair->getKey();

            attName.setName(rawPtr, fEmptyNamespaceId);
            const XMLCh* prefPtr = attName.getPrefix();

            // if schema URI has been seen, scan for the schema location and uri
            // and resolve the schema grammar; or scan for schema type
            if (resolvePrefix(prefPtr, ElemStack::Mode_Attribute) == fSchemaNamespaceId) {

                const XMLCh* valuePtr = curPair->getValue();
                const XMLCh* suffPtr = attName.getLocalPart();

                if (XMLString::equals(suffPtr, SchemaSymbols::fgXSI_SCHEMALOCACTION))
                    parseSchemaLocation(valuePtr);
                else if (XMLString::equals(suffPtr, SchemaSymbols::fgXSI_NONAMESPACESCHEMALOCACTION))
                    resolveSchemaGrammar(valuePtr, XMLUni::fgZeroLenString);

                if (XMLString::equals(suffPtr, SchemaSymbols::fgXSI_TYPE)) {
                        fXsiType.set(valuePtr);
                }
                else if (XMLString::equals(suffPtr, SchemaSymbols::fgATT_NILL)
                         && fValidator && fValidator->handlesSchema()
                         && XMLString::equals(valuePtr, SchemaSymbols::fgATTVAL_TRUE)) {
                            ((SchemaValidator*)fValidator)->setNillable(true);
                }
            }
        }

        if (fValidator && fValidator->handlesSchema()) {
            if (!fXsiType.isEmpty()) {
                int colonPos = -1;
                unsigned int uriId = resolveQName (
                      fXsiType.getRawBuffer()
                    , fPrefixBuf
                    , ElemStack::Mode_Element
                    , colonPos
                );
                ((SchemaValidator*)fValidator)->setXsiType(fPrefixBuf.getRawBuffer(), fXsiType.getRawBuffer() + colonPos + 1, uriId);
            }
        }
    }
}

void SGXMLScanner::parseSchemaLocation(const XMLCh* const schemaLocationStr)
{
    BaseRefVectorOf<XMLCh>* schemaLocation = XMLString::tokenizeString(schemaLocationStr);
    unsigned int size = schemaLocation->size();
    if (size % 2 != 0 ) {
        emitError(XMLErrs::BadSchemaLocation);
    } else {
        for(unsigned int i=0; i<size; i=i+2) {
            resolveSchemaGrammar(schemaLocation->elementAt(i+1), schemaLocation->elementAt(i));
        }
    }

    delete schemaLocation;
}

void SGXMLScanner::resolveSchemaGrammar(const XMLCh* const loc, const XMLCh* const uri) {

    Grammar* grammar = fGrammarResolver->getGrammar(uri);

    if (!grammar || grammar->getGrammarType() == Grammar::DTDGrammarType) {
        XSDDOMParser parser;

        parser.setValidationScheme(XercesDOMParser::Val_Never);
        parser.setDoNamespaces(true);
        parser.setUserEntityHandler(fEntityHandler);
        parser.setUserErrorReporter(fErrorReporter);

        // Create a buffer for expanding the system id
        XMLBufBid bbSys(&fBufMgr);
        XMLBuffer& expSysId = bbSys.getBuffer();
        XMLBuffer& normalizedSysId = bbSys.getBuffer();

        normalizeURI(loc, normalizedSysId);

        //  Allow the entity handler to expand the system id if they choose
        //  to do so.
        InputSource* srcToFill = 0;
        const XMLCh* normalizedURI = normalizedSysId.getRawBuffer();
        if (fEntityHandler)
        {
            if (!fEntityHandler->expandSystemId(normalizedURI, expSysId))
                expSysId.set(normalizedURI);

            srcToFill = fEntityHandler->resolveEntity( XMLUni::fgZeroLenString
                                                     , expSysId.getRawBuffer());
        }
        else
        {
            expSysId.set(normalizedURI);
        }

        //  If they didn't create a source via the entity handler, then we
        //  have to create one on our own.
        if (!srcToFill)
        {
            ReaderMgr::LastExtEntityInfo lastInfo;
            fReaderMgr.getLastExtEntityInfo(lastInfo);

            try
            {
                XMLURL urlTmp(lastInfo.systemId, expSysId.getRawBuffer());
                if (urlTmp.isRelative())
                {
                    ThrowXML
                    (
                        MalformedURLException
                        , XMLExcepts::URL_NoProtocolPresent
                    );
                }
                else {
                    if (fStandardUriConformant && urlTmp.hasInvalidChar())
                        ThrowXML(MalformedURLException, XMLExcepts::URL_MalformedURL);
                    srcToFill = new URLInputSource(urlTmp);
                }
            }

            catch(const MalformedURLException& e)
            {
                // Its not a URL, so lets assume its a local file name if non-standard uri is allowed
                if (!fStandardUriConformant)
                    srcToFill = new LocalFileInputSource
                    (
                        lastInfo.systemId
                        , expSysId.getRawBuffer()
                    );
                else
                    throw e;
            }
        }

        // Put a janitor on the input source
        Janitor<InputSource> janSrc(srcToFill);

        // Should just issue warning if the schema is not found