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	/*
	* Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.
	*/
	/*
	* 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.dom;

	import com.sun.org.apache.xerces.internal.impl.RevalidationHandler;
	import com.sun.org.apache.xerces.internal.impl.dtd.XML11DTDProcessor;
	import com.sun.org.apache.xerces.internal.impl.dtd.XML11DTDValidator;
	import com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDLoader;
	import com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator;
	import com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator;
	import com.sun.org.apache.xerces.internal.parsers.DOMParserImpl;
	import com.sun.org.apache.xerces.internal.parsers.DTDConfiguration;
	import com.sun.org.apache.xerces.internal.parsers.XIncludeAwareParserConfiguration;
	import com.sun.org.apache.xerces.internal.parsers.XML11DTDConfiguration;
	import com.sun.org.apache.xerces.internal.util.XMLChar;
	import com.sun.org.apache.xerces.internal.xni.grammars.XMLGrammarDescription;
	import java.lang.ref.SoftReference;
	import org.w3c.dom.DOMException;
	import org.w3c.dom.DOMImplementation;
	import org.w3c.dom.Document;
	import org.w3c.dom.DocumentType;
	import org.w3c.dom.Element;
	import org.w3c.dom.ls.LSParser;
	import org.w3c.dom.ls.DOMImplementationLS;
	import org.w3c.dom.ls.LSInput;
	import org.w3c.dom.ls.LSOutput;
	import org.w3c.dom.ls.LSSerializer;
	/**
	* The DOMImplementation class is description of a particular
	* implementation of the Document Object Model. As such its data is
	* static, shared by all instances of this implementation.
	* <P>
	* The DOM API requires that it be a real object rather than static
	* methods. However, there's nothing that says it can't be a singleton,
	* so that's how I've implemented it.
	* <P>
	* This particular class, along with CoreDocumentImpl, supports the DOM
	* Core and Load/Save (Experimental). Optional modules are supported by
	* the more complete DOMImplementation class along with DocumentImpl.
	*
	* @xerces.internal
	*
	* @since PR-DOM-Level-1-19980818.
	* @LastModified: Apr 2019
	*/
	@SuppressWarnings({"rawtypes", "unchecked"}) //SoftReference array
	public class CoreDOMImplementationImpl
	implements DOMImplementation, DOMImplementationLS {

	//
	// Data
	//

	// validator pools
	private static final int SIZE = 2;

	private SoftReference schemaValidators[] = new SoftReference[SIZE];
	private SoftReference xml10DTDValidators[] = new SoftReference[SIZE];
	private SoftReference xml11DTDValidators[] = new SoftReference[SIZE];

	private int freeSchemaValidatorIndex = -1;
	private int freeXML10DTDValidatorIndex = -1;
	private int freeXML11DTDValidatorIndex = -1;

	private int schemaValidatorsCurrentSize = SIZE;
	private int xml10DTDValidatorsCurrentSize = SIZE;
	private int xml11DTDValidatorsCurrentSize = SIZE;

	private SoftReference xml10DTDLoaders[] = new SoftReference[SIZE];
	private SoftReference xml11DTDLoaders[] = new SoftReference[SIZE];

	private int freeXML10DTDLoaderIndex = -1;
	private int freeXML11DTDLoaderIndex = -1;

	private int xml10DTDLoaderCurrentSize = SIZE;
	private int xml11DTDLoaderCurrentSize = SIZE;

	// Document and doctype counter. Used to assign order to documents and
	// doctypes without owners, on an demand basis. Used for
	// compareDocumentPosition
	private int docAndDoctypeCounter = 0;

	// static
	/** Dom implementation singleton. */
	static final CoreDOMImplementationImpl singleton = new CoreDOMImplementationImpl();

	//
	// Public methods
	//
	/** NON-DOM: Obtain and return the single shared object */
	public static DOMImplementation getDOMImplementation() {
	return singleton;
	}
	//
	// DOMImplementation methods
	//
	/**
	* Test if the DOM implementation supports a specific "feature" --
	* currently meaning language and level thereof.
	*
	* @param feature The package name of the feature to test.
	* In Level 1, supported values are "HTML" and "XML" (case-insensitive).
	* At this writing, com.sun.org.apache.xerces.internal.dom supports only XML.
	*
	* @param version The version number of the feature being tested.
	* This is interpreted as "Version of the DOM API supported for the
	* specified Feature", and in Level 1 should be "1.0"
	*
	* @return true if this implementation is compatible with the specified
	* feature and version.
	*/
	public boolean hasFeature(String feature, String version) {

	boolean anyVersion = version == null \|\| version.length() == 0;

	if (feature.startsWith("+")) {
	feature = feature.substring(1);
	}
	return (feature.equalsIgnoreCase("Core")
	&& (anyVersion
	\|\| version.equals("1.0")
	\|\| version.equals("2.0")
	\|\| version.equals("3.0")))
	\|\| (feature.equalsIgnoreCase("XML")
	&& (anyVersion
	\|\| version.equals("1.0")
	\|\| version.equals("2.0")
	\|\| version.equals("3.0")))
	\|\| (feature.equalsIgnoreCase("XMLVersion")
	&& (anyVersion
	\|\| version.equals("1.0")
	\|\| version.equals("1.1")))
	\|\| (feature.equalsIgnoreCase("LS")
	&& (anyVersion
	\|\| version.equals("3.0")))
	\|\| (feature.equalsIgnoreCase("ElementTraversal")
	&& (anyVersion
	\|\| version.equals("1.0")));
	} // hasFeature(String,String):boolean


	/**
	* Introduced in DOM Level 2. <p>
	*
	* Creates an empty DocumentType node.
	*
	* @param qualifiedName The qualified name of the document type to be created.
	* @param publicID The document type public identifier.
	* @param systemID The document type system identifier.
	* @since WD-DOM-Level-2-19990923
	*/
	public DocumentType createDocumentType( String qualifiedName,
	String publicID, String systemID) {
	// REVISIT: this might allow creation of invalid name for DOCTYPE
	// xmlns prefix.
	// also there is no way for a user to turn off error checking.
	checkQName(qualifiedName);
	return new DocumentTypeImpl(null, qualifiedName, publicID, systemID);
	}

	final void checkQName(String qname){
	int index = qname.indexOf(':');
	int lastIndex = qname.lastIndexOf(':');
	int length = qname.length();

	// it is an error for NCName to have more than one ':'
	// check if it is valid QName [Namespace in XML production 6]
	if (index == 0 \|\| index == length - 1 \|\| lastIndex != index) {
	String msg =
	DOMMessageFormatter.formatMessage(
	DOMMessageFormatter.DOM_DOMAIN,
	"NAMESPACE_ERR",
	null);
	throw new DOMException(DOMException.NAMESPACE_ERR, msg);
	}
	int start = 0;
	// Namespace in XML production [6]
	if (index > 0) {
	// check that prefix is NCName
	if (!XMLChar.isNCNameStart(qname.charAt(start))) {
	String msg =
	DOMMessageFormatter.formatMessage(
	DOMMessageFormatter.DOM_DOMAIN,
	"INVALID_CHARACTER_ERR",
	null);
	throw new DOMException(DOMException.INVALID_CHARACTER_ERR, msg);
	}
	for (int i = 1; i < index; i++) {
	if (!XMLChar.isNCName(qname.charAt(i))) {
	String msg =
	DOMMessageFormatter.formatMessage(
	DOMMessageFormatter.DOM_DOMAIN,
	"INVALID_CHARACTER_ERR",
	null);
	throw new DOMException(
	DOMException.INVALID_CHARACTER_ERR,
	msg);
	}
	}
	start = index + 1;
	}

	// check local part
	if (!XMLChar.isNCNameStart(qname.charAt(start))) {
	// REVISIT: add qname parameter to the message
	String msg =
	DOMMessageFormatter.formatMessage(
	DOMMessageFormatter.DOM_DOMAIN,
	"INVALID_CHARACTER_ERR",
	null);
	throw new DOMException(DOMException.INVALID_CHARACTER_ERR, msg);
	}
	for (int i = start + 1; i < length; i++) {
	if (!XMLChar.isNCName(qname.charAt(i))) {
	String msg =
	DOMMessageFormatter.formatMessage(
	DOMMessageFormatter.DOM_DOMAIN,
	"INVALID_CHARACTER_ERR",
	null);
	throw new DOMException(DOMException.INVALID_CHARACTER_ERR, msg);
	}
	}
	}


	/**
	* Introduced in DOM Level 2. <p>
	*
	* Creates an XML Document object of the specified type with its document
	* element.
	*
	* @param namespaceURI The namespace URI of the document
	* element to create, or null.
	* @param qualifiedName The qualified name of the document
	* element to create.
	* @param doctype The type of document to be created or null.<p>
	*
	* When doctype is not null, its
	* Node.ownerDocument attribute is set to
	* the document being created.
	* @return Document A new Document object.
	* @throws DOMException WRONG_DOCUMENT_ERR: Raised if doctype has
	* already been used with a different document.
	* @since WD-DOM-Level-2-19990923
	*/
	public Document createDocument(
	String namespaceURI,
	String qualifiedName,
	DocumentType doctype)
	throws DOMException {
	if (doctype != null && doctype.getOwnerDocument() != null) {
	String msg =
	DOMMessageFormatter.formatMessage(
	DOMMessageFormatter.DOM_DOMAIN,
	"WRONG_DOCUMENT_ERR",
	null);
	throw new DOMException(DOMException.WRONG_DOCUMENT_ERR, msg);
	}
	CoreDocumentImpl doc = createDocument(doctype);
	// If namespaceURI and qualifiedName are null return a Document with no document element.
	if (qualifiedName != null \|\| namespaceURI != null) {
	Element e = doc.createElementNS(namespaceURI, qualifiedName);
	doc.appendChild(e);
	}
	return doc;
	}

	protected CoreDocumentImpl createDocument(DocumentType doctype) {
	return new CoreDocumentImpl(doctype);
	}

	/**
	* DOM Level 3 WD - Experimental.
	*/
	public Object getFeature(String feature, String version) {
	if (singleton.hasFeature(feature, version)) {
	return singleton;
	}
	return null;
	}

	// DOM L3 LS

	/**
	* DOM Level 3 LS CR - Experimental.
	* Create a new <code>LSParser</code>. The newly constructed parser may
	* then be configured by means of its <code>DOMConfiguration</code>
	* object, and used to parse documents by means of its <code>parse</code>
	* method.
	* @param mode The <code>mode</code> argument is either
	* <code>MODE_SYNCHRONOUS</code> or <code>MODE_ASYNCHRONOUS</code>, if
	* <code>mode</code> is <code>MODE_SYNCHRONOUS</code> then the
	* <code>LSParser</code> that is created will operate in synchronous
	* mode, if it's <code>MODE_ASYNCHRONOUS</code> then the
	* <code>LSParser</code> that is created will operate in asynchronous
	* mode.
	* @param schemaType An absolute URI representing the type of the schema
	* language used during the load of a <code>Document</code> using the
	* newly created <code>LSParser</code>. Note that no lexical checking
	* is done on the absolute URI. In order to create a
	* <code>LSParser</code> for any kind of schema types (i.e. the
	* LSParser will be free to use any schema found), use the value
	* <code>null</code>.
	* <p ><b>Note:</b> For W3C XML Schema [<a href='http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/'>XML Schema Part 1</a>]
	* , applications must use the value
	* <code>"http://www.w3.org/2001/XMLSchema"</code>. For XML DTD [<a href='http://www.w3.org/TR/2000/REC-xml-20001006'>XML 1.0</a>],
	* applications must use the value
	* <code>"http://www.w3.org/TR/REC-xml"</code>. Other Schema languages
	* are outside the scope of the W3C and therefore should recommend an
	* absolute URI in order to use this method.
	* @return The newly created <code>LSParser</code> object. This
	* <code>LSParser</code> is either synchronous or asynchronous
	* depending on the value of the <code>mode</code> argument.
	* <p ><b>Note:</b> By default, the newly created <code>LSParser</code>
	* does not contain a <code>DOMErrorHandler</code>, i.e. the value of
	* the "<a href='http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030609/core.html#parameter-error-handler'>
	* error-handler</a>" configuration parameter is <code>null</code>. However, implementations
	* may provide a default error handler at creation time. In that case,
	* the initial value of the <code>"error-handler"</code> configuration
	* parameter on the new created <code>LSParser</code> contains a
	* reference to the default error handler.
	* @exception DOMException
	* NOT_SUPPORTED_ERR: Raised if the requested mode or schema type is
	* not supported.
	*/
	public LSParser createLSParser(short mode, String schemaType)
	throws DOMException {
	if (mode != DOMImplementationLS.MODE_SYNCHRONOUS \|\| (schemaType !=null &&
	!"http://www.w3.org/2001/XMLSchema".equals(schemaType) &&
	!"http://www.w3.org/TR/REC-xml".equals(schemaType))) {
	String msg =
	DOMMessageFormatter.formatMessage(
	DOMMessageFormatter.DOM_DOMAIN,
	"NOT_SUPPORTED_ERR",
	null);
	throw new DOMException(DOMException.NOT_SUPPORTED_ERR, msg);
	}
	if (schemaType != null
	&& schemaType.equals("http://www.w3.org/TR/REC-xml")) {
	return new DOMParserImpl(new XML11DTDConfiguration(),
	schemaType);
	}
	else {
	// create default parser configuration validating against XMLSchemas
	return new DOMParserImpl(new XIncludeAwareParserConfiguration(),
	schemaType);
	}
	}

	/**
	* DOM Level 3 LS CR - Experimental.
	* Create a new <code>LSSerializer</code> object.
	* @return The newly created <code>LSSerializer</code> object.
	* <p ><b>Note:</b> By default, the newly created
	* <code>LSSerializer</code> has no <code>DOMErrorHandler</code>,
	* i.e. the value of the <code>"error-handler"</code> configuration
	* parameter is <code>null</code>. However, implementations may
	* provide a default error handler at creation time. In that case, the
	* initial value of the <code>"error-handler"</code> configuration
	* parameter on the new created <code>LSSerializer</code> contains a
	* reference to the default error handler.
	*/
	public LSSerializer createLSSerializer() {
	return new com.sun.org.apache.xml.internal.serializer.dom3.LSSerializerImpl();
	}

	/**
	* DOM Level 3 LS CR - Experimental.
	* Create a new empty input source.
	* @return The newly created input object.
	*/
	public LSInput createLSInput() {
	return new DOMInputImpl();
	}

	//
	// Protected methods
	//
	/** NON-DOM: retrieve validator. */
	synchronized RevalidationHandler getValidator(String schemaType, String xmlVersion) {
	if (schemaType == XMLGrammarDescription.XML_SCHEMA) {
	// create new validator - we should not attempt
	// to restrict the number of validation handlers being
	// requested
	while (freeSchemaValidatorIndex >= 0) {
	// return first available validator
	SoftReference ref = schemaValidators[freeSchemaValidatorIndex];
	RevalidationHandlerHolder holder = (RevalidationHandlerHolder) ref.get();
	if (holder != null && holder.handler != null) {
	RevalidationHandler val = holder.handler;
	holder.handler = null;
	--freeSchemaValidatorIndex;
	return val;
	}
	schemaValidators[freeSchemaValidatorIndex--] = null;
	}
	return new XMLSchemaValidator();
	}
	else if(schemaType == XMLGrammarDescription.XML_DTD) {
	// return an instance of XML11DTDValidator
	if ("1.1".equals(xmlVersion)) {
	while (freeXML11DTDValidatorIndex >= 0) {
	// return first available validator
	SoftReference ref = xml11DTDValidators[freeXML11DTDValidatorIndex];
	RevalidationHandlerHolder holder = (RevalidationHandlerHolder) ref.get();
	if (holder != null && holder.handler != null) {
	RevalidationHandler val = holder.handler;
	holder.handler = null;
	--freeXML11DTDValidatorIndex;
	return val;
	}
	xml11DTDValidators[freeXML11DTDValidatorIndex--] = null;
	}
	return new XML11DTDValidator();
	}
	// return an instance of XMLDTDValidator
	else {
	while (freeXML10DTDValidatorIndex >= 0) {
	// return first available validator
	SoftReference ref = xml10DTDValidators[freeXML10DTDValidatorIndex];
	RevalidationHandlerHolder holder = (RevalidationHandlerHolder) ref.get();
	if (holder != null && holder.handler != null) {
	RevalidationHandler val = holder.handler;
	holder.handler = null;
	--freeXML10DTDValidatorIndex;
	return val;
	}
	xml10DTDValidators[freeXML10DTDValidatorIndex--] = null;
	}
	return new XMLDTDValidator();
	}
	}
	return null;
	}

	/** NON-DOM: release validator */
	synchronized void releaseValidator(String schemaType, String xmlVersion,
	RevalidationHandler validator) {
	if (schemaType == XMLGrammarDescription.XML_SCHEMA) {
	++freeSchemaValidatorIndex;
	if (schemaValidators.length == freeSchemaValidatorIndex) {
	// resize size of the validators
	schemaValidatorsCurrentSize += SIZE;
	SoftReference newarray[] = new SoftReference[schemaValidatorsCurrentSize];
	System.arraycopy(schemaValidators, 0, newarray, 0, schemaValidators.length);
	schemaValidators = newarray;
	}
	SoftReference ref = schemaValidators[freeSchemaValidatorIndex];
	if (ref != null) {
	RevalidationHandlerHolder holder = (RevalidationHandlerHolder) ref.get();
	if (holder != null) {
	holder.handler = validator;
	return;
	}
	}
	schemaValidators[freeSchemaValidatorIndex] = new SoftReference(new RevalidationHandlerHolder(validator));
	}
	else if (schemaType == XMLGrammarDescription.XML_DTD) {
	// release an instance of XML11DTDValidator
	if ("1.1".equals(xmlVersion)) {
	++freeXML11DTDValidatorIndex;
	if (xml11DTDValidators.length == freeXML11DTDValidatorIndex) {
	// resize size of the validators
	xml11DTDValidatorsCurrentSize += SIZE;
	SoftReference [] newarray = new SoftReference[xml11DTDValidatorsCurrentSize];
	System.arraycopy(xml11DTDValidators, 0, newarray, 0, xml11DTDValidators.length);
	xml11DTDValidators = newarray;
	}
	SoftReference ref = xml11DTDValidators[freeXML11DTDValidatorIndex];
	if (ref != null) {
	RevalidationHandlerHolder holder = (RevalidationHandlerHolder) ref.get();
	if (holder != null) {
	holder.handler = validator;
	return;
	}
	}
	xml11DTDValidators[freeXML11DTDValidatorIndex] = new SoftReference(new RevalidationHandlerHolder(validator));
	}
	// release an instance of XMLDTDValidator
	else {
	++freeXML10DTDValidatorIndex;
	if (xml10DTDValidators.length == freeXML10DTDValidatorIndex) {
	// resize size of the validators
	xml10DTDValidatorsCurrentSize += SIZE;
	SoftReference [] newarray = new SoftReference[xml10DTDValidatorsCurrentSize];
	System.arraycopy(xml10DTDValidators, 0, newarray, 0, xml10DTDValidators.length);
	xml10DTDValidators = newarray;
	}
	SoftReference ref = xml10DTDValidators[freeXML10DTDValidatorIndex];
	if (ref != null) {
	RevalidationHandlerHolder holder = (RevalidationHandlerHolder) ref.get();
	if (holder != null) {
	holder.handler = validator;
	return;
	}
	}
	xml10DTDValidators[freeXML10DTDValidatorIndex] = new SoftReference(new RevalidationHandlerHolder(validator));
	}
	}
	}

	/** NON-DOM: retrieve DTD loader */
	synchronized final XMLDTDLoader getDTDLoader(String xmlVersion) {
	// return an instance of XML11DTDProcessor
	if ("1.1".equals(xmlVersion)) {
	while (freeXML11DTDLoaderIndex >= 0) {
	// return first available DTD loader
	SoftReference ref = xml11DTDLoaders[freeXML11DTDLoaderIndex];
	XMLDTDLoaderHolder holder = (XMLDTDLoaderHolder) ref.get();
	if (holder != null && holder.loader != null) {
	XMLDTDLoader val = holder.loader;
	holder.loader = null;
	--freeXML11DTDLoaderIndex;
	return val;
	}
	xml11DTDLoaders[freeXML11DTDLoaderIndex--] = null;
	}
	return new XML11DTDProcessor();
	}
	// return an instance of XMLDTDLoader
	else {
	while (freeXML10DTDLoaderIndex >= 0) {
	// return first available DTD loader
	SoftReference ref = xml10DTDLoaders[freeXML10DTDLoaderIndex];
	XMLDTDLoaderHolder holder = (XMLDTDLoaderHolder) ref.get();
	if (holder != null && holder.loader != null) {
	XMLDTDLoader val = holder.loader;
	holder.loader = null;
	--freeXML10DTDLoaderIndex;
	return val;
	}
	xml10DTDLoaders[freeXML10DTDLoaderIndex--] = null;
	}
	return new XMLDTDLoader();
	}
	}

	/** NON-DOM: release DTD loader */
	synchronized final void releaseDTDLoader(String xmlVersion, XMLDTDLoader loader) {
	// release an instance of XMLDTDLoader
	if ("1.1".equals(xmlVersion)) {
	++freeXML11DTDLoaderIndex;
	if (xml11DTDLoaders.length == freeXML11DTDLoaderIndex) {
	// resize size of the DTD loaders
	xml11DTDLoaderCurrentSize += SIZE;
	SoftReference [] newarray = new SoftReference[xml11DTDLoaderCurrentSize];
	System.arraycopy(xml11DTDLoaders, 0, newarray, 0, xml11DTDLoaders.length);
	xml11DTDLoaders = newarray;
	}
	SoftReference ref = xml11DTDLoaders[freeXML11DTDLoaderIndex];
	if (ref != null) {
	XMLDTDLoaderHolder holder = (XMLDTDLoaderHolder) ref.get();
	if (holder != null) {
	holder.loader = loader;
	return;
	}
	}
	xml11DTDLoaders[freeXML11DTDLoaderIndex] = new SoftReference(new XMLDTDLoaderHolder(loader));
	}
	// release an instance of XMLDTDLoader
	else {
	++freeXML10DTDLoaderIndex;
	if (xml10DTDLoaders.length == freeXML10DTDLoaderIndex) {
	// resize size of the DTD loaders
	xml10DTDLoaderCurrentSize += SIZE;
	SoftReference [] newarray = new SoftReference[xml10DTDLoaderCurrentSize];
	System.arraycopy(xml10DTDLoaders, 0, newarray, 0, xml10DTDLoaders.length);
	xml10DTDLoaders = newarray;
	}
	SoftReference ref = xml10DTDLoaders[freeXML10DTDLoaderIndex];
	if (ref != null) {
	XMLDTDLoaderHolder holder = (XMLDTDLoaderHolder) ref.get();
	if (holder != null) {
	holder.loader = loader;
	return;
	}
	}
	xml10DTDLoaders[freeXML10DTDLoaderIndex] = new SoftReference(new XMLDTDLoaderHolder(loader));
	}
	}

	/** NON-DOM: increment document/doctype counter */
	protected synchronized int assignDocumentNumber() {
	return ++docAndDoctypeCounter;
	}

	/** NON-DOM: increment document/doctype counter */
	protected synchronized int assignDocTypeNumber() {
	return ++docAndDoctypeCounter;
	}

	/* DOM Level 3 LS CR - Experimental.
	*
	* Create a new empty output destination object where
	* <code>LSOutput.characterStream</code>,
	* <code>LSOutput.byteStream</code>, <code>LSOutput.systemId</code>,
	* <code>LSOutput.encoding</code> are null.
	* @return The newly created output object.
	*/
	public LSOutput createLSOutput() {
	return new DOMOutputImpl();
	}

	/**
	* A holder for RevalidationHandlers. This allows us to reuse
	* SoftReferences which haven't yet been cleared by the garbage
	* collector.
	*/
	static final class RevalidationHandlerHolder {
	RevalidationHandlerHolder(RevalidationHandler handler) {
	this.handler = handler;
	}
	RevalidationHandler handler;
	}

	/**
	* A holder for XMLDTDLoaders. This allows us to reuse SoftReferences
	* which haven't yet been cleared by the garbage collector.
	*/
	static final class XMLDTDLoaderHolder {
	XMLDTDLoaderHolder(XMLDTDLoader loader) {
	this.loader = loader;
	}
	XMLDTDLoader loader;
	}

	} // class DOMImplementationImpl

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