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	/*
	* reserved comment block
	* DO NOT REMOVE OR ALTER!
	*/
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You under the Apache License, Version 2.0
	* (the "License"); you may not use this file except in compliance with
	* the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package com.sun.org.apache.xerces.internal.impl.dtd;

	import com.sun.org.apache.xerces.internal.impl.XMLErrorReporter;
	import com.sun.org.apache.xerces.internal.impl.msg.XMLMessageFormatter;
	import com.sun.org.apache.xerces.internal.util.XMLSymbols;
	import com.sun.org.apache.xerces.internal.xni.Augmentations;
	import com.sun.org.apache.xerces.internal.xni.NamespaceContext;
	import com.sun.org.apache.xerces.internal.xni.QName;
	import com.sun.org.apache.xerces.internal.xni.XMLAttributes;
	import com.sun.org.apache.xerces.internal.xni.XNIException;


	/**
	* The DTD validator. The validator implements a document
	* filter: receiving document events from the scanner; validating
	* the content and structure; augmenting the InfoSet, if applicable;
	* and notifying the parser of the information resulting from the
	* validation process.
	* <p> Formerly, this component also handled DTD events and grammar construction.
	* To facilitate the development of a meaningful DTD grammar caching/preparsing
	* framework, this functionality has been moved into the XMLDTDLoader
	* class. Therefore, this class no longer implements the DTDFilter
	* or DTDContentModelFilter interfaces.
	* <p>
	* This component requires the following features and properties from the
	* component manager that uses it:
	* <ul>
	* <li>http://xml.org/sax/features/namespaces</li>
	* <li>http://xml.org/sax/features/validation</li>
	* <li>http://apache.org/xml/features/validation/dynamic</li>
	* <li>http://apache.org/xml/properties/internal/symbol-table</li>
	* <li>http://apache.org/xml/properties/internal/error-reporter</li>
	* <li>http://apache.org/xml/properties/internal/grammar-pool</li>
	* <li>http://apache.org/xml/properties/internal/datatype-validator-factory</li>
	* </ul>
	*
	* @xerces.internal
	*
	* @author Elena Litani, IBM
	*

	*/
	public class XMLNSDTDValidator
	extends XMLDTDValidator{

	/** Attribute QName. */
	private QName fAttributeQName = new QName();


	/** Bind namespaces */
	protected final void startNamespaceScope (QName element, XMLAttributes attributes,
	Augmentations augs) throws XNIException {

	// add new namespace context
	fNamespaceContext.pushContext();

	if (element.prefix == XMLSymbols.PREFIX_XMLNS) {
	fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
	"ElementXMLNSPrefix",
	new Object[]{element.rawname},
	XMLErrorReporter.SEVERITY_FATAL_ERROR);
	}

	// search for new namespace bindings
	int length = attributes.getLength();
	for (int i = 0; i < length; i++) {
	String localpart = attributes.getLocalName(i);
	String prefix = attributes.getPrefix(i);
	// when it's of form xmlns="..." or xmlns:prefix="...",
	// it's a namespace declaration. but prefix:xmlns="..." isn't.
	if (prefix == XMLSymbols.PREFIX_XMLNS \|\|
	prefix == XMLSymbols.EMPTY_STRING && localpart == XMLSymbols.PREFIX_XMLNS) {

	// get the internalized value of this attribute
	String uri = fSymbolTable.addSymbol(attributes.getValue(i));

	// 1. "xmlns" can't be bound to any namespace
	if (prefix == XMLSymbols.PREFIX_XMLNS && localpart == XMLSymbols.PREFIX_XMLNS) {
	fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
	"CantBindXMLNS",
	new Object[]{attributes.getQName(i)},
	XMLErrorReporter.SEVERITY_FATAL_ERROR);
	}

	// 2. the namespace for "xmlns" can't be bound to any prefix
	if (uri == NamespaceContext.XMLNS_URI) {
	fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
	"CantBindXMLNS",
	new Object[]{attributes.getQName(i)},
	XMLErrorReporter.SEVERITY_FATAL_ERROR);
	}

	// 3. "xml" can't be bound to any other namespace than it's own
	if (localpart == XMLSymbols.PREFIX_XML) {
	if (uri != NamespaceContext.XML_URI) {
	fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
	"CantBindXML",
	new Object[]{attributes.getQName(i)},
	XMLErrorReporter.SEVERITY_FATAL_ERROR);
	}
	}
	// 4. the namespace for "xml" can't be bound to any other prefix
	else {
	if (uri ==NamespaceContext.XML_URI) {
	fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
	"CantBindXML",
	new Object[]{attributes.getQName(i)},
	XMLErrorReporter.SEVERITY_FATAL_ERROR);
	}
	}

	prefix = localpart != XMLSymbols.PREFIX_XMLNS ? localpart : XMLSymbols.EMPTY_STRING;

	// http://www.w3.org/TR/1999/REC-xml-names-19990114/#dt-prefix
	// We should only report an error if there is a prefix,
	// that is, the local part is not "xmlns". -SG
	if (uri == XMLSymbols.EMPTY_STRING && localpart != XMLSymbols.PREFIX_XMLNS) {
	fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
	"EmptyPrefixedAttName",
	new Object[]{attributes.getQName(i)},
	XMLErrorReporter.SEVERITY_FATAL_ERROR);
	continue;
	}

	// declare prefix in context
	fNamespaceContext.declarePrefix(prefix, uri.length() != 0 ? uri : null);
	}
	}

	// bind the element
	String prefix = element.prefix != null
	? element.prefix : XMLSymbols.EMPTY_STRING;
	element.uri = fNamespaceContext.getURI(prefix);
	if (element.prefix == null && element.uri != null) {
	element.prefix = XMLSymbols.EMPTY_STRING;
	}
	if (element.prefix != null && element.uri == null) {
	fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
	"ElementPrefixUnbound",
	new Object[]{element.prefix, element.rawname},
	XMLErrorReporter.SEVERITY_FATAL_ERROR);
	}

	// bind the attributes
	for (int i = 0; i < length; i++) {
	attributes.getName(i, fAttributeQName);
	String aprefix = fAttributeQName.prefix != null
	? fAttributeQName.prefix : XMLSymbols.EMPTY_STRING;
	String arawname = fAttributeQName.rawname;
	if (arawname == XMLSymbols.PREFIX_XMLNS) {
	fAttributeQName.uri = fNamespaceContext.getURI(XMLSymbols.PREFIX_XMLNS);
	attributes.setName(i, fAttributeQName);
	}
	else if (aprefix != XMLSymbols.EMPTY_STRING) {
	fAttributeQName.uri = fNamespaceContext.getURI(aprefix);
	if (fAttributeQName.uri == null) {
	fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
	"AttributePrefixUnbound",
	new Object[]{element.rawname,arawname,aprefix},
	XMLErrorReporter.SEVERITY_FATAL_ERROR);
	}
	attributes.setName(i, fAttributeQName);
	}
	}

	// verify that duplicate attributes don't exist
	// Example: <foo xmlns:a='NS' xmlns:b='NS' a:attr='v1' b:attr='v2'/>
	int attrCount = attributes.getLength();
	for (int i = 0; i < attrCount - 1; i++) {
	String auri = attributes.getURI(i);
	if (auri == null \|\| auri == NamespaceContext.XMLNS_URI) {
	continue;
	}
	String alocalpart = attributes.getLocalName(i);
	for (int j = i + 1; j < attrCount; j++) {
	String blocalpart = attributes.getLocalName(j);
	String buri = attributes.getURI(j);
	if (alocalpart == blocalpart && auri == buri) {
	fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
	"AttributeNSNotUnique",
	new Object[]{element.rawname,alocalpart, auri},
	XMLErrorReporter.SEVERITY_FATAL_ERROR);
	}
	}
	}


	} // startNamespaceScope(QName,XMLAttributes)


	/** Handles end element. */
	protected void endNamespaceScope(QName element, Augmentations augs, boolean isEmpty)
	throws XNIException {

	// bind element
	String eprefix = element.prefix != null ? element.prefix : XMLSymbols.EMPTY_STRING;
	element.uri = fNamespaceContext.getURI(eprefix);
	if (element.uri != null) {
	element.prefix = eprefix;
	}

	// call handlers
	if (fDocumentHandler != null) {
	if (!isEmpty) {
	fDocumentHandler.endElement(element, augs);
	}
	}

	// pop context
	fNamespaceContext.popContext();

	} // endNamespaceScope(QName,boolean)

	}

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