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	/*
	* Copyright (c) 2015, 2021, 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.xalan.internal.xsltc.compiler;

	import com.sun.java_cup.internal.runtime.Symbol;
	import com.sun.org.apache.xalan.internal.utils.ObjectFactory;
	import com.sun.org.apache.xalan.internal.utils.XMLSecurityManager;
	import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
	import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodType;
	import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
	import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
	import com.sun.org.apache.xml.internal.serializer.utils.SystemIDResolver;
	import java.io.File;
	import java.io.IOException;
	import java.io.StringReader;
	import java.util.ArrayList;
	import java.util.HashMap;
	import java.util.Iterator;
	import java.util.List;
	import java.util.Map;
	import java.util.Properties;
	import java.util.Stack;
	import java.util.StringTokenizer;
	import javax.xml.XMLConstants;
	import javax.xml.catalog.CatalogFeatures;
	import jdk.xml.internal.ErrorHandlerProxy;
	import jdk.xml.internal.JdkConstants;
	import jdk.xml.internal.JdkXmlFeatures;
	import jdk.xml.internal.JdkXmlUtils;
	import jdk.xml.internal.SecuritySupport;
	import org.xml.sax.Attributes;
	import org.xml.sax.ContentHandler;
	import org.xml.sax.InputSource;
	import org.xml.sax.Locator;
	import org.xml.sax.SAXException;
	import org.xml.sax.SAXNotRecognizedException;
	import org.xml.sax.SAXNotSupportedException;
	import org.xml.sax.XMLReader;
	import org.xml.sax.helpers.AttributesImpl;

	/**
	* @author Jacek Ambroziak
	* @author Santiago Pericas-Geertsen
	* @author G. Todd Miller
	* @author Morten Jorgensen
	* @author Erwin Bolwidt <ejb@klomp.org>
	* @LastModified: May 2021
	*/
	public class Parser implements Constants, ContentHandler {

	private static final String XSL = "xsl"; // standard prefix
	private static final String TRANSLET = "translet"; // extension prefix

	private Locator _locator = null;

	private XSLTC _xsltc; // Reference to the compiler object.
	private XPathParser _xpathParser; // Reference to the XPath parser.
	private ArrayList<ErrorMsg> _errors; // Contains all compilation errors
	private ArrayList<ErrorMsg> _warnings; // Contains all compilation warnings

	private Map<String, String> _instructionClasses; // Maps instructions to classes
	private Map<String, String[]> _instructionAttrs; // reqd and opt attrs
	private Map<String, QName> _qNames;
	private Map<String, Map<String, QName>> _namespaces;
	private QName _useAttributeSets;
	private QName _excludeResultPrefixes;
	private QName _extensionElementPrefixes;
	private Map<String, Object> _variableScope;
	private Stylesheet _currentStylesheet;
	private SymbolTable _symbolTable; // Maps QNames to syntax-tree nodes
	private Output _output;
	private Template _template; // Reference to the template being parsed.

	private boolean _rootNamespaceDef; // Used for validity check

	private SyntaxTreeNode _root;

	private String _target;

	private int _currentImportPrecedence;

	private boolean _overrideDefaultParser;

	// flag indicates whether there's an user's ErrorListener
	private boolean _hasUserErrListener;

	public Parser(XSLTC xsltc, boolean useOverrideDefaultParser, boolean hasUserErrListener) {
	_xsltc = xsltc;
	_overrideDefaultParser = useOverrideDefaultParser;
	_hasUserErrListener = hasUserErrListener;
	}

	public void init() {
	_qNames = new HashMap<>(512);
	_namespaces = new HashMap<>();
	_instructionClasses = new HashMap<>();
	_instructionAttrs = new HashMap<>();
	_variableScope = new HashMap<>();
	_template = null;
	_errors = new ArrayList<>();
	_warnings = new ArrayList<>();
	_symbolTable = new SymbolTable();
	_xpathParser = new XPathParser(this);
	_currentStylesheet = null;
	_output = null;
	_root = null;
	_rootNamespaceDef = false;
	_currentImportPrecedence = 1;

	initStdClasses();
	initInstructionAttrs();
	initExtClasses();
	initSymbolTable();

	_useAttributeSets =
	getQName(XSLT_URI, XSL, "use-attribute-sets");
	_excludeResultPrefixes =
	getQName(XSLT_URI, XSL, "exclude-result-prefixes");
	_extensionElementPrefixes =
	getQName(XSLT_URI, XSL, "extension-element-prefixes");
	}

	public void setOutput(Output output) {
	if (_output != null) {
	if (_output.getImportPrecedence() <= output.getImportPrecedence()) {
	output.mergeOutput(_output);
	_output.disable();
	_output = output;
	}
	else {
	output.disable();
	}
	}
	else {
	_output = output;
	}
	}

	public Output getOutput() {
	return _output;
	}

	public Properties getOutputProperties() {
	return getTopLevelStylesheet().getOutputProperties();
	}

	public void addVariable(Variable var) {
	addVariableOrParam(var);
	}

	public void addParameter(Param param) {
	addVariableOrParam(param);
	}

	private void addVariableOrParam(VariableBase var) {
	Object existing = _variableScope.get(var.getName().getStringRep());
	if (existing != null) {
	if (existing instanceof Stack) {
	@SuppressWarnings("unchecked")
	Stack<VariableBase> stack = (Stack<VariableBase>)existing;
	stack.push(var);
	}
	else if (existing instanceof VariableBase) {
	Stack<VariableBase> stack = new Stack<>();
	stack.push((VariableBase)existing);
	stack.push(var);
	_variableScope.put(var.getName().getStringRep(), stack);
	}
	}
	else {
	_variableScope.put(var.getName().getStringRep(), var);
	}
	}

	public void removeVariable(QName name) {
	Object existing = _variableScope.get(name.getStringRep());
	if (existing instanceof Stack) {
	@SuppressWarnings("unchecked")
	Stack<VariableBase> stack = (Stack<VariableBase>)existing;
	if (!stack.isEmpty()) stack.pop();
	if (!stack.isEmpty()) return;
	}
	_variableScope.remove(name.getStringRep());
	}

	public VariableBase lookupVariable(QName name) {
	Object existing = _variableScope.get(name.getStringRep());
	if (existing instanceof VariableBase) {
	return (VariableBase)existing;
	}
	else if (existing instanceof Stack) {
	@SuppressWarnings("unchecked")
	Stack<VariableBase> stack = (Stack<VariableBase>)existing;
	return stack.peek();
	}
	return null;
	}

	public void setXSLTC(XSLTC xsltc) {
	_xsltc = xsltc;
	}

	public XSLTC getXSLTC() {
	return _xsltc;
	}

	public int getCurrentImportPrecedence() {
	return _currentImportPrecedence;
	}

	public int getNextImportPrecedence() {
	return ++_currentImportPrecedence;
	}

	public void setCurrentStylesheet(Stylesheet stylesheet) {
	_currentStylesheet = stylesheet;
	}

	public Stylesheet getCurrentStylesheet() {
	return _currentStylesheet;
	}

	public Stylesheet getTopLevelStylesheet() {
	return _xsltc.getStylesheet();
	}

	public QName getQNameSafe(final String stringRep) {
	// parse and retrieve namespace
	final int colon = stringRep.lastIndexOf(':');
	if (colon != -1) {
	final String prefix = stringRep.substring(0, colon);
	final String localname = stringRep.substring(colon + 1);
	String namespace = null;

	// Get the namespace uri from the symbol table
	if (prefix.equals(XMLNS_PREFIX) == false) {
	namespace = _symbolTable.lookupNamespace(prefix);
	if (namespace == null) namespace = EMPTYSTRING;
	}
	return getQName(namespace, prefix, localname);
	}
	else {
	final String uri = stringRep.equals(XMLNS_PREFIX) ? null
	: _symbolTable.lookupNamespace(EMPTYSTRING);
	return getQName(uri, null, stringRep);
	}
	}

	public QName getQName(final String stringRep) {
	return getQName(stringRep, true, false);
	}

	public QName getQNameIgnoreDefaultNs(final String stringRep) {
	return getQName(stringRep, true, true);
	}

	public QName getQName(final String stringRep, boolean reportError) {
	return getQName(stringRep, reportError, false);
	}

	private QName getQName(final String stringRep, boolean reportError,
	boolean ignoreDefaultNs)
	{
	// parse and retrieve namespace
	final int colon = stringRep.lastIndexOf(':');
	if (colon != -1) {
	final String prefix = stringRep.substring(0, colon);
	final String localname = stringRep.substring(colon + 1);
	String namespace = null;

	// Get the namespace uri from the symbol table
	if (prefix.equals(XMLNS_PREFIX) == false) {
	namespace = _symbolTable.lookupNamespace(prefix);
	if (namespace == null && reportError) {
	final int line = getLineNumber();
	ErrorMsg err = new ErrorMsg(ErrorMsg.NAMESPACE_UNDEF_ERR,
	line, prefix);
	reportError(ERROR, err);
	}
	}
	return getQName(namespace, prefix, localname);
	}
	else {
	if (stringRep.equals(XMLNS_PREFIX)) {
	ignoreDefaultNs = true;
	}
	final String defURI = ignoreDefaultNs ? null
	: _symbolTable.lookupNamespace(EMPTYSTRING);
	return getQName(defURI, null, stringRep);
	}
	}

	public QName getQName(String namespace, String prefix, String localname) {
	if (namespace == null \|\| namespace.equals(EMPTYSTRING)) {
	QName name = _qNames.get(localname);
	if (name == null) {
	name = new QName(null, prefix, localname);
	_qNames.put(localname, name);
	}
	return name;
	}
	else {
	Map<String, QName> space = _namespaces.get(namespace);
	String lexicalQName =
	(prefix == null \|\| prefix.length() == 0)
	? localname
	: (prefix + ':' + localname);

	if (space == null) {
	final QName name = new QName(namespace, prefix, localname);
	_namespaces.put(namespace, space = new HashMap<>());
	space.put(lexicalQName, name);
	return name;
	}
	else {
	QName name = space.get(lexicalQName);
	if (name == null) {
	name = new QName(namespace, prefix, localname);
	space.put(lexicalQName, name);
	}
	return name;
	}
	}
	}

	public QName getQName(String scope, String name) {
	return getQName(scope + name);
	}

	public QName getQName(QName scope, QName name) {
	return getQName(scope.toString() + name.toString());
	}

	public QName getUseAttributeSets() {
	return _useAttributeSets;
	}

	public QName getExtensionElementPrefixes() {
	return _extensionElementPrefixes;
	}

	public QName getExcludeResultPrefixes() {
	return _excludeResultPrefixes;
	}

	/**
	* Create an instance of the <code>Stylesheet</code> class,
	* and then parse, typecheck and compile the instance.
	* Must be called after <code>parse()</code>.
	*/
	public Stylesheet makeStylesheet(SyntaxTreeNode element)
	throws CompilerException {
	try {
	Stylesheet stylesheet;

	if (element instanceof Stylesheet) {
	stylesheet = (Stylesheet)element;
	}
	else {
	stylesheet = new Stylesheet();
	stylesheet.setSimplified();
	stylesheet.addElement(element);
	stylesheet.setAttributes((AttributesImpl) element.getAttributes());

	// Map the default NS if not already defined
	if (element.lookupNamespace(EMPTYSTRING) == null) {
	element.addPrefixMapping(EMPTYSTRING, EMPTYSTRING);
	}
	}
	stylesheet.setParser(this);
	return stylesheet;
	}
	catch (ClassCastException e) {
	ErrorMsg err = new ErrorMsg(ErrorMsg.NOT_STYLESHEET_ERR, element);
	throw new CompilerException(err.toString());
	}
	}

	/**
	* Instanciates a SAX2 parser and generate the AST from the input.
	*/
	public void createAST(Stylesheet stylesheet) {
	try {
	if (stylesheet != null) {
	stylesheet.parseContents(this);
	final Iterator<SyntaxTreeNode> elements = stylesheet.elements();
	while (elements.hasNext()) {
	SyntaxTreeNode child = elements.next();
	if (child instanceof Text) {
	final int l = getLineNumber();
	ErrorMsg err =
	new ErrorMsg(ErrorMsg.ILLEGAL_TEXT_NODE_ERR,l,null);
	reportError(ERROR, err);
	}
	}
	if (!errorsFound()) {
	stylesheet.typeCheck(_symbolTable);
	}
	}
	}
	catch (TypeCheckError e) {
	reportError(ERROR, new ErrorMsg(ErrorMsg.JAXP_COMPILE_ERR, e));
	}
	}

	/**
	* Parses a stylesheet and builds the internal abstract syntax tree
	* @param reader A SAX2 SAXReader (parser)
	* @param input A SAX2 InputSource can be passed to a SAX reader
	* @return The root of the abstract syntax tree
	*/
	public SyntaxTreeNode parse(XMLReader reader, InputSource input) {
	try {
	// Parse the input document and build the abstract syntax tree
	reader.setContentHandler(this);
	if (_hasUserErrListener) {
	// Set a ErrorHandler proxy to pass any parsing error on to be handled
	// by the user's ErrorListener
	reader.setErrorHandler(new ErrorHandlerProxy());
	}
	reader.parse(input);
	// Find the start of the stylesheet within the tree
	return getStylesheet(_root);
	}
	catch (IOException e) {
	if (_xsltc.debug()) e.printStackTrace();
	reportError(ERROR,new ErrorMsg(ErrorMsg.JAXP_COMPILE_ERR, e));
	}
	catch (SAXException e) {
	Throwable ex = e.getException();
	if (_xsltc.debug()) {
	e.printStackTrace();
	if (ex != null) ex.printStackTrace();
	}
	reportError(ERROR, new ErrorMsg(ErrorMsg.JAXP_COMPILE_ERR, e));
	}
	catch (CompilerException e) {
	if (_xsltc.debug()) e.printStackTrace();
	reportError(ERROR, new ErrorMsg(ErrorMsg.JAXP_COMPILE_ERR, e));
	}
	catch (Exception e) {
	if (_xsltc.debug()) e.printStackTrace();
	reportError(ERROR, new ErrorMsg(ErrorMsg.JAXP_COMPILE_ERR, e));
	}
	return null;
	}

	/**
	* Parses a stylesheet and builds the internal abstract syntax tree
	* @param input A SAX2 InputSource can be passed to a SAX reader
	* @return The root of the abstract syntax tree
	*/
	public SyntaxTreeNode parse(InputSource input) {
	try {
	final XMLReader reader = JdkXmlUtils.getXMLReader(_overrideDefaultParser,
	_xsltc.isSecureProcessing());

	JdkXmlUtils.setXMLReaderPropertyIfSupport(reader, XMLConstants.ACCESS_EXTERNAL_DTD,
	_xsltc.getProperty(XMLConstants.ACCESS_EXTERNAL_DTD), true);


	boolean supportCatalog = true;
	boolean useCatalog = _xsltc.getFeature(JdkXmlFeatures.XmlFeature.USE_CATALOG);
	try {
	reader.setFeature(JdkXmlUtils.USE_CATALOG, useCatalog);
	}
	catch (SAXNotRecognizedException \| SAXNotSupportedException e) {
	supportCatalog = false;
	}

	if (supportCatalog && useCatalog) {
	try {
	CatalogFeatures cf = (CatalogFeatures)_xsltc.getProperty(JdkXmlFeatures.CATALOG_FEATURES);
	if (cf != null) {
	for (CatalogFeatures.Feature f : CatalogFeatures.Feature.values()) {
	reader.setProperty(f.getPropertyName(), cf.get(f));
	}
	}
	} catch (SAXNotRecognizedException e) {
	//shall not happen for internal settings
	}
	}

	String lastProperty = "";
	try {
	XMLSecurityManager securityManager =
	(XMLSecurityManager)_xsltc.getProperty(JdkConstants.SECURITY_MANAGER);
	for (XMLSecurityManager.Limit limit : XMLSecurityManager.Limit.values()) {
	lastProperty = limit.apiProperty();
	reader.setProperty(lastProperty, securityManager.getLimitValueAsString(limit));
	}
	if (securityManager.printEntityCountInfo()) {
	lastProperty = JdkConstants.JDK_DEBUG_LIMIT;
	reader.setProperty(lastProperty, JdkConstants.JDK_YES);
	}
	} catch (SAXException se) {
	XMLSecurityManager.printWarning(reader.getClass().getName(), lastProperty, se);
	}

	// try setting other JDK-impl properties, ignore if not supported
	JdkXmlUtils.setXMLReaderPropertyIfSupport(reader, JdkConstants.CDATA_CHUNK_SIZE,
	_xsltc.getProperty(JdkConstants.CDATA_CHUNK_SIZE), false);

	return(parse(reader, input));
	}
	catch (SAXException e) {
	reportError(ERROR, new ErrorMsg(e.getMessage()));
	}
	return null;
	}

	public SyntaxTreeNode getDocumentRoot() {
	return _root;
	}

	private String _PImedia = null;
	private String _PItitle = null;
	private String _PIcharset = null;

	/**
	* Set the parameters to use to locate the correct <?xml-stylesheet ...?>
	* processing instruction in the case where the input document is an
	* XML document with one or more references to a stylesheet.
	* @param media The media attribute to be matched. May be null, in which
	* case the prefered templates will be used (i.e. alternate = no).
	* @param title The value of the title attribute to match. May be null.
	* @param charset The value of the charset attribute to match. May be null.
	*/
	protected void setPIParameters(String media, String title, String charset) {
	_PImedia = media;
	_PItitle = title;
	_PIcharset = charset;
	}

	/**
	* Extracts the DOM for the stylesheet. In the case of an embedded
	* stylesheet, it extracts the DOM subtree corresponding to the
	* embedded stylesheet that has an 'id' attribute whose value is the
	* same as the value declared in the <?xml-stylesheet...?> processing
	* instruction (P.I.). In the xml-stylesheet P.I. the value is labeled
	* as the 'href' data of the P.I. The extracted DOM representing the
	* stylesheet is returned as an Element object.
	*/
	private SyntaxTreeNode getStylesheet(SyntaxTreeNode root)
	throws CompilerException {

	// Assume that this is a pure XSL stylesheet if there is not
	// <?xml-stylesheet ....?> processing instruction
	if (_target == null) {
	if (!_rootNamespaceDef) {
	ErrorMsg msg = new ErrorMsg(ErrorMsg.MISSING_XSLT_URI_ERR);
	throw new CompilerException(msg.toString());
	}
	return(root);
	}

	// Find the xsl:stylesheet or xsl:transform with this reference
	if (_target.charAt(0) == '#') {
	SyntaxTreeNode element = findStylesheet(root, _target.substring(1));
	if (element == null) {
	ErrorMsg msg = new ErrorMsg(ErrorMsg.MISSING_XSLT_TARGET_ERR,
	_target, root);
	throw new CompilerException(msg.toString());
	}
	return(element);
	}
	else {
	try {
	String path = _target;
	if (path.indexOf(":")==-1) {
	path = "file:" + path;
	}
	path = SystemIDResolver.getAbsoluteURI(path);
	String accessError = SecuritySupport.checkAccess(path,
	(String)_xsltc.getProperty(XMLConstants.ACCESS_EXTERNAL_STYLESHEET),
	JdkConstants.ACCESS_EXTERNAL_ALL);
	if (accessError != null) {
	ErrorMsg msg = new ErrorMsg(ErrorMsg.ACCESSING_XSLT_TARGET_ERR,
	SecuritySupport.sanitizePath(_target), accessError,
	root);
	throw new CompilerException(msg.toString());
	}
	} catch (IOException ex) {
	throw new CompilerException(ex);
	}

	return(loadExternalStylesheet(_target));
	}
	}

	/**
	* Find a Stylesheet element with a specific ID attribute value.
	* This method is used to find a Stylesheet node that is referred
	* in a <?xml-stylesheet ... ?> processing instruction.
	*/
	private SyntaxTreeNode findStylesheet(SyntaxTreeNode root, String href) {

	if (root == null) return null;

	if (root instanceof Stylesheet) {
	String id = root.getAttribute("id");
	if (id.equals(href)) return root;
	}
	List<SyntaxTreeNode> children = root.getContents();
	if (children != null) {
	final int count = children.size();
	for (int i = 0; i < count; i++) {
	SyntaxTreeNode child = children.get(i);
	SyntaxTreeNode node = findStylesheet(child, href);
	if (node != null) return node;
	}
	}
	return null;
	}

	/**
	* For embedded stylesheets: Load an external file with stylesheet
	*/
	private SyntaxTreeNode loadExternalStylesheet(String location)
	throws CompilerException {

	InputSource source;

	// Check if the location is URL or a local file
	if ((new File(location)).exists())
	source = new InputSource("file:"+location);
	else
	source = new InputSource(location);

	SyntaxTreeNode external = parse(source);
	return(external);
	}

	private void initAttrTable(String elementName, String[] attrs) {
	_instructionAttrs.put(getQName(XSLT_URI, XSL, elementName).getStringRep(),
	attrs);
	}

	private void initInstructionAttrs() {
	initAttrTable("template",
	new String[] {"match", "name", "priority", "mode"});
	initAttrTable("stylesheet",
	new String[] {"id", "version", "extension-element-prefixes",
	"exclude-result-prefixes"});
	initAttrTable("transform",
	new String[] {"id", "version", "extension-element-prefixes",
	"exclude-result-prefixes"});
	initAttrTable("text", new String[] {"disable-output-escaping"});
	initAttrTable("if", new String[] {"test"});
	initAttrTable("choose", new String[] {});
	initAttrTable("when", new String[] {"test"});
	initAttrTable("otherwise", new String[] {});
	initAttrTable("for-each", new String[] {"select"});
	initAttrTable("message", new String[] {"terminate"});
	initAttrTable("number",
	new String[] {"level", "count", "from", "value", "format", "lang",
	"letter-value", "grouping-separator", "grouping-size"});
	initAttrTable("comment", new String[] {});
	initAttrTable("copy", new String[] {"use-attribute-sets"});
	initAttrTable("copy-of", new String[] {"select"});
	initAttrTable("param", new String[] {"name", "select"});
	initAttrTable("with-param", new String[] {"name", "select"});
	initAttrTable("variable", new String[] {"name", "select"});
	initAttrTable("output",
	new String[] {"method", "version", "encoding",
	"omit-xml-declaration", "standalone", "doctype-public",
	"doctype-system", "cdata-section-elements", "indent",
	"media-type"});
	initAttrTable("sort",
	new String[] {"select", "order", "case-order", "lang", "data-type"});
	initAttrTable("key", new String[] {"name", "match", "use"});
	initAttrTable("fallback", new String[] {});
	initAttrTable("attribute", new String[] {"name", "namespace"});
	initAttrTable("attribute-set",
	new String[] {"name", "use-attribute-sets"});
	initAttrTable("value-of",
	new String[] {"select", "disable-output-escaping"});
	initAttrTable("element",
	new String[] {"name", "namespace", "use-attribute-sets"});
	initAttrTable("call-template", new String[] {"name"});
	initAttrTable("apply-templates", new String[] {"select", "mode"});
	initAttrTable("apply-imports", new String[] {});
	initAttrTable("decimal-format",
	new String[] {"name", "decimal-separator", "grouping-separator",
	"infinity", "minus-sign", "NaN", "percent", "per-mille",
	"zero-digit", "digit", "pattern-separator"});
	initAttrTable("import", new String[] {"href"});
	initAttrTable("include", new String[] {"href"});
	initAttrTable("strip-space", new String[] {"elements"});
	initAttrTable("preserve-space", new String[] {"elements"});
	initAttrTable("processing-instruction", new String[] {"name"});
	initAttrTable("namespace-alias",
	new String[] {"stylesheet-prefix", "result-prefix"});
	}

	/**
	* Initialize the _instructionClasses map, which maps XSL element
	* names to Java classes in this package.
	*/
	private void initStdClasses() {
	initStdClass("template", "Template");
	initStdClass("stylesheet", "Stylesheet");
	initStdClass("transform", "Stylesheet");
	initStdClass("text", "Text");
	initStdClass("if", "If");
	initStdClass("choose", "Choose");
	initStdClass("when", "When");
	initStdClass("otherwise", "Otherwise");
	initStdClass("for-each", "ForEach");
	initStdClass("message", "Message");
	initStdClass("number", "Number");
	initStdClass("comment", "Comment");
	initStdClass("copy", "Copy");
	initStdClass("copy-of", "CopyOf");
	initStdClass("param", "Param");
	initStdClass("with-param", "WithParam");
	initStdClass("variable", "Variable");
	initStdClass("output", "Output");
	initStdClass("sort", "Sort");
	initStdClass("key", "Key");
	initStdClass("fallback", "Fallback");
	initStdClass("attribute", "XslAttribute");
	initStdClass("attribute-set", "AttributeSet");
	initStdClass("value-of", "ValueOf");
	initStdClass("element", "XslElement");
	initStdClass("call-template", "CallTemplate");
	initStdClass("apply-templates", "ApplyTemplates");
	initStdClass("apply-imports", "ApplyImports");
	initStdClass("decimal-format", "DecimalFormatting");
	initStdClass("import", "Import");
	initStdClass("include", "Include");
	initStdClass("strip-space", "Whitespace");
	initStdClass("preserve-space", "Whitespace");
	initStdClass("processing-instruction", "ProcessingInstruction");
	initStdClass("namespace-alias", "NamespaceAlias");
	}

	private void initStdClass(String elementName, String className) {
	_instructionClasses.put(getQName(XSLT_URI, XSL, elementName).getStringRep(),
	COMPILER_PACKAGE + '.' + className);
	}

	public boolean elementSupported(String namespace, String localName) {
	return(_instructionClasses.get(getQName(namespace, XSL, localName).getStringRep()) != null);
	}

	public boolean functionSupported(String fname) {
	return(_symbolTable.lookupPrimop(fname) != null);
	}

	private void initExtClasses() {
	initExtClass("output", "TransletOutput");
	initExtClass(REDIRECT_URI, "write", "TransletOutput");
	}

	private void initExtClass(String elementName, String className) {
	_instructionClasses.put(getQName(TRANSLET_URI, TRANSLET, elementName).getStringRep(),
	COMPILER_PACKAGE + '.' + className);
	}

	private void initExtClass(String namespace, String elementName, String className) {
	_instructionClasses.put(getQName(namespace, TRANSLET, elementName).getStringRep(),
	COMPILER_PACKAGE + '.' + className);
	}

	/**
	* Add primops and base functions to the symbol table.
	*/
	@SuppressWarnings("unused")
	private void initSymbolTable() {
	MethodType I_V = new MethodType(Type.Int, Type.Void);
	MethodType I_R = new MethodType(Type.Int, Type.Real);
	MethodType I_S = new MethodType(Type.Int, Type.String);
	MethodType I_D = new MethodType(Type.Int, Type.NodeSet);
	MethodType R_I = new MethodType(Type.Real, Type.Int);
	MethodType R_V = new MethodType(Type.Real, Type.Void);
	MethodType R_R = new MethodType(Type.Real, Type.Real);
	MethodType R_D = new MethodType(Type.Real, Type.NodeSet);
	MethodType R_O = new MethodType(Type.Real, Type.Reference);
	MethodType I_I = new MethodType(Type.Int, Type.Int);
	MethodType D_O = new MethodType(Type.NodeSet, Type.Reference);
	MethodType D_V = new MethodType(Type.NodeSet, Type.Void);
	MethodType D_S = new MethodType(Type.NodeSet, Type.String);
	MethodType D_D = new MethodType(Type.NodeSet, Type.NodeSet);
	MethodType A_V = new MethodType(Type.Node, Type.Void);
	MethodType S_V = new MethodType(Type.String, Type.Void);
	MethodType S_S = new MethodType(Type.String, Type.String);
	MethodType S_A = new MethodType(Type.String, Type.Node);
	MethodType S_D = new MethodType(Type.String, Type.NodeSet);
	MethodType S_O = new MethodType(Type.String, Type.Reference);
	MethodType B_O = new MethodType(Type.Boolean, Type.Reference);
	MethodType B_V = new MethodType(Type.Boolean, Type.Void);
	MethodType B_B = new MethodType(Type.Boolean, Type.Boolean);
	MethodType B_S = new MethodType(Type.Boolean, Type.String);
	MethodType D_X = new MethodType(Type.NodeSet, Type.Object);
	MethodType R_RR = new MethodType(Type.Real, Type.Real, Type.Real);
	MethodType I_II = new MethodType(Type.Int, Type.Int, Type.Int);
	MethodType B_RR = new MethodType(Type.Boolean, Type.Real, Type.Real);
	MethodType B_II = new MethodType(Type.Boolean, Type.Int, Type.Int);
	MethodType S_SS = new MethodType(Type.String, Type.String, Type.String);
	MethodType S_DS = new MethodType(Type.String, Type.Real, Type.String);
	MethodType S_SR = new MethodType(Type.String, Type.String, Type.Real);
	MethodType O_SO = new MethodType(Type.Reference, Type.String, Type.Reference);

	MethodType D_SS =
	new MethodType(Type.NodeSet, Type.String, Type.String);
	MethodType D_SD =
	new MethodType(Type.NodeSet, Type.String, Type.NodeSet);
	MethodType B_BB =
	new MethodType(Type.Boolean, Type.Boolean, Type.Boolean);
	MethodType B_SS =
	new MethodType(Type.Boolean, Type.String, Type.String);
	MethodType S_SD =
	new MethodType(Type.String, Type.String, Type.NodeSet);
	MethodType S_DSS =
	new MethodType(Type.String, Type.Real, Type.String, Type.String);
	MethodType S_SRR =
	new MethodType(Type.String, Type.String, Type.Real, Type.Real);
	MethodType S_SSS =
	new MethodType(Type.String, Type.String, Type.String, Type.String);

	/*
	* Standard functions: implemented but not in this table concat().
	* When adding a new function make sure to uncomment
	* the corresponding line in <tt>FunctionAvailableCall</tt>.
	*/

	// The following functions are inlined

	_symbolTable.addPrimop("current", A_V);
	_symbolTable.addPrimop("last", I_V);
	_symbolTable.addPrimop("position", I_V);
	_symbolTable.addPrimop("true", B_V);
	_symbolTable.addPrimop("false", B_V);
	_symbolTable.addPrimop("not", B_B);
	_symbolTable.addPrimop("name", S_V);
	_symbolTable.addPrimop("name", S_A);
	_symbolTable.addPrimop("generate-id", S_V);
	_symbolTable.addPrimop("generate-id", S_A);
	_symbolTable.addPrimop("ceiling", R_R);
	_symbolTable.addPrimop("floor", R_R);
	_symbolTable.addPrimop("round", R_R);
	_symbolTable.addPrimop("contains", B_SS);
	_symbolTable.addPrimop("number", R_O);
	_symbolTable.addPrimop("number", R_V);
	_symbolTable.addPrimop("boolean", B_O);
	_symbolTable.addPrimop("string", S_O);
	_symbolTable.addPrimop("string", S_V);
	_symbolTable.addPrimop("translate", S_SSS);
	_symbolTable.addPrimop("string-length", I_V);
	_symbolTable.addPrimop("string-length", I_S);
	_symbolTable.addPrimop("starts-with", B_SS);
	_symbolTable.addPrimop("format-number", S_DS);
	_symbolTable.addPrimop("format-number", S_DSS);
	_symbolTable.addPrimop("unparsed-entity-uri", S_S);
	_symbolTable.addPrimop("key", D_SS);
	_symbolTable.addPrimop("key", D_SD);
	_symbolTable.addPrimop("id", D_S);
	_symbolTable.addPrimop("id", D_D);
	_symbolTable.addPrimop("namespace-uri", S_V);
	_symbolTable.addPrimop("function-available", B_S);
	_symbolTable.addPrimop("element-available", B_S);
	_symbolTable.addPrimop("document", D_S);
	_symbolTable.addPrimop("document", D_V);

	// The following functions are implemented in the basis library
	_symbolTable.addPrimop("count", I_D);
	_symbolTable.addPrimop("sum", R_D);
	_symbolTable.addPrimop("local-name", S_V);
	_symbolTable.addPrimop("local-name", S_D);
	_symbolTable.addPrimop("namespace-uri", S_V);
	_symbolTable.addPrimop("namespace-uri", S_D);
	_symbolTable.addPrimop("substring", S_SR);
	_symbolTable.addPrimop("substring", S_SRR);
	_symbolTable.addPrimop("substring-after", S_SS);
	_symbolTable.addPrimop("substring-before", S_SS);
	_symbolTable.addPrimop("normalize-space", S_V);
	_symbolTable.addPrimop("normalize-space", S_S);
	_symbolTable.addPrimop("system-property", S_S);

	// Extensions
	_symbolTable.addPrimop("nodeset", D_O);
	_symbolTable.addPrimop("objectType", S_O);
	_symbolTable.addPrimop("cast", O_SO);

	// Operators +, -, *, /, % defined on real types.
	_symbolTable.addPrimop("+", R_RR);
	_symbolTable.addPrimop("-", R_RR);
	_symbolTable.addPrimop("*", R_RR);
	_symbolTable.addPrimop("/", R_RR);
	_symbolTable.addPrimop("%", R_RR);

	// Operators +, -, * defined on integer types.
	// Operators / and % are not defined on integers (may cause exception)
	_symbolTable.addPrimop("+", I_II);
	_symbolTable.addPrimop("-", I_II);
	_symbolTable.addPrimop("*", I_II);

	// Operators <, <= >, >= defined on real types.
	_symbolTable.addPrimop("<", B_RR);
	_symbolTable.addPrimop("<=", B_RR);
	_symbolTable.addPrimop(">", B_RR);
	_symbolTable.addPrimop(">=", B_RR);

	// Operators <, <= >, >= defined on int types.
	_symbolTable.addPrimop("<", B_II);
	_symbolTable.addPrimop("<=", B_II);
	_symbolTable.addPrimop(">", B_II);
	_symbolTable.addPrimop(">=", B_II);

	// Operators <, <= >, >= defined on boolean types.
	_symbolTable.addPrimop("<", B_BB);
	_symbolTable.addPrimop("<=", B_BB);
	_symbolTable.addPrimop(">", B_BB);
	_symbolTable.addPrimop(">=", B_BB);

	// Operators 'and' and 'or'.
	_symbolTable.addPrimop("or", B_BB);
	_symbolTable.addPrimop("and", B_BB);

	// Unary minus.
	_symbolTable.addPrimop("u-", R_R);
	_symbolTable.addPrimop("u-", I_I);
	}

	public SymbolTable getSymbolTable() {
	return _symbolTable;
	}

	public Template getTemplate() {
	return _template;
	}

	public void setTemplate(Template template) {
	_template = template;
	}

	private int _templateIndex = 0;

	public int getTemplateIndex() {
	return(_templateIndex++);
	}

	/**
	* Creates a new node in the abstract syntax tree. This node can be
	* o) a supported XSLT 1.0 element
	* o) an unsupported XSLT element (post 1.0)
	* o) a supported XSLT extension
	* o) an unsupported XSLT extension
	* o) a literal result element (not an XSLT element and not an extension)
	* Unsupported elements do not directly generate an error. We have to wait
	* until we have received all child elements of an unsupported element to
	* see if any <xsl:fallback> elements exist.
	*/

	private boolean versionIsOne = true;

	public SyntaxTreeNode makeInstance(String uri, String prefix,
	String local, Attributes attributes)
	{
	SyntaxTreeNode node = null;
	QName qname = getQName(uri, prefix, local);
	String className = _instructionClasses.get(qname.getStringRep());

	if (className != null) {
	try {
	final Class<?> clazz = ObjectFactory.findProviderClass(className, true);
	node = (SyntaxTreeNode)clazz.getDeclaredConstructor().newInstance();
	node.setQName(qname);
	node.setParser(this);
	if (_locator != null) {
	node.setLineNumber(getLineNumber());
	}
	if (node instanceof Stylesheet) {
	_xsltc.setStylesheet((Stylesheet)node);
	}
	checkForSuperfluousAttributes(node, attributes);
	}
	catch (ClassNotFoundException e) {
	ErrorMsg err = new ErrorMsg(ErrorMsg.CLASS_NOT_FOUND_ERR, node);
	reportError(ERROR, err);
	}
	catch (Exception e) {
	ErrorMsg err = new ErrorMsg(ErrorMsg.INTERNAL_ERR,
	e.getMessage(), node);
	reportError(FATAL, err);
	}
	}
	else {
	if (uri != null) {
	// Check if the element belongs in our namespace
	if (uri.equals(XSLT_URI)) {
	node = new UnsupportedElement(uri, prefix, local, false);
	UnsupportedElement element = (UnsupportedElement)node;
	ErrorMsg msg = new ErrorMsg(ErrorMsg.UNSUPPORTED_XSL_ERR,
	getLineNumber(),local);
	element.setErrorMessage(msg);
	if (versionIsOne) {
	reportError(UNSUPPORTED,msg);
	}
	}
	// Check if this is an XSLTC extension element
	else if (uri.equals(TRANSLET_URI)) {
	node = new UnsupportedElement(uri, prefix, local, true);
	UnsupportedElement element = (UnsupportedElement)node;
	ErrorMsg msg = new ErrorMsg(ErrorMsg.UNSUPPORTED_EXT_ERR,
	getLineNumber(),local);
	element.setErrorMessage(msg);
	}
	// Check if this is an extension of some other XSLT processor
	else {
	Stylesheet sheet = _xsltc.getStylesheet();
	if ((sheet != null) && (sheet.isExtension(uri))) {
	if (sheet != _parentStack.peek()) {
	node = new UnsupportedElement(uri, prefix, local, true);
	UnsupportedElement elem = (UnsupportedElement)node;
	ErrorMsg msg =
	new ErrorMsg(ErrorMsg.UNSUPPORTED_EXT_ERR,
	getLineNumber(),
	prefix+":"+local);
	elem.setErrorMessage(msg);
	}
	}
	}
	}
	if (node == null) {
	node = new LiteralElement();
	node.setLineNumber(getLineNumber());
	}
	}
	if ((node != null) && (node instanceof LiteralElement)) {
	((LiteralElement)node).setQName(qname);
	}
	return(node);
	}

	/**
	* checks the list of attributes against a list of allowed attributes
	* for a particular element node.
	*/
	private void checkForSuperfluousAttributes(SyntaxTreeNode node,
	Attributes attrs)
	{
	QName qname = node.getQName();
	boolean isStylesheet = (node instanceof Stylesheet);
	String[] legal = _instructionAttrs.get(qname.getStringRep());
	if (versionIsOne && legal != null) {
	int j;
	final int n = attrs.getLength();

	for (int i = 0; i < n; i++) {
	final String attrQName = attrs.getQName(i);

	if (isStylesheet && attrQName.equals("version")) {
	versionIsOne = attrs.getValue(i).equals("1.0");
	}

	// Ignore if special or if it has a prefix
	if (attrQName.startsWith("xml") \|\|
	attrQName.indexOf(':') > 0) continue;

	for (j = 0; j < legal.length; j++) {
	if (attrQName.equalsIgnoreCase(legal[j])) {
	break;
	}
	}
	if (j == legal.length) {
	final ErrorMsg err =
	new ErrorMsg(ErrorMsg.ILLEGAL_ATTRIBUTE_ERR,
	attrQName, node);
	// Workaround for the TCK failure ErrorListener.errorTests.error001..
	err.setWarningError(true);
	reportError(WARNING, err);
	}
	}
	}
	}


	/**
	* Parse an XPath expression:
	* @param parent - XSL element where the expression occured
	* @param exp - textual representation of the expression
	*/
	public Expression parseExpression(SyntaxTreeNode parent, String exp) {
	return (Expression)parseTopLevel(parent, "<EXPRESSION>"+exp, null);
	}

	/**
	* Parse an XPath expression:
	* @param parent - XSL element where the expression occured
	* @param attr - name of this element's attribute to get expression from
	* @param def - default expression (if the attribute was not found)
	*/
	public Expression parseExpression(SyntaxTreeNode parent,
	String attr, String def) {
	// Get the textual representation of the expression (if any)
	String exp = parent.getAttribute(attr);
	// Use the default expression if none was found
	if ((exp.length() == 0) && (def != null)) exp = def;
	// Invoke the XPath parser
	return (Expression)parseTopLevel(parent, "<EXPRESSION>"+exp, exp);
	}

	/**
	* Parse an XPath pattern:
	* @param parent - XSL element where the pattern occured
	* @param pattern - textual representation of the pattern
	*/
	public Pattern parsePattern(SyntaxTreeNode parent, String pattern) {
	return (Pattern)parseTopLevel(parent, "<PATTERN>"+pattern, pattern);
	}

	/**
	* Parse an XPath pattern:
	* @param parent - XSL element where the pattern occured
	* @param attr - name of this element's attribute to get pattern from
	* @param def - default pattern (if the attribute was not found)
	*/
	public Pattern parsePattern(SyntaxTreeNode parent,
	String attr, String def) {
	// Get the textual representation of the pattern (if any)
	String pattern = parent.getAttribute(attr);
	// Use the default pattern if none was found
	if ((pattern.length() == 0) && (def != null)) pattern = def;
	// Invoke the XPath parser
	return (Pattern)parseTopLevel(parent, "<PATTERN>"+pattern, pattern);
	}

	/**
	* Parse an XPath expression or pattern using the generated XPathParser
	* The method will return a Dummy node if the XPath parser fails.
	*/
	private SyntaxTreeNode parseTopLevel(SyntaxTreeNode parent, String text,
	String expression) {
	int line = getLineNumber();

	try {
	_xpathParser.setScanner(new XPathLexer(new StringReader(text)));
	Symbol result = _xpathParser.parse(expression, line);
	if (result != null) {
	final SyntaxTreeNode node = (SyntaxTreeNode)result.value;
	if (node != null) {
	node.setParser(this);
	node.setParent(parent);
	node.setLineNumber(line);
	return node;
	}
	}
	reportError(ERROR, new ErrorMsg(ErrorMsg.XPATH_PARSER_ERR,
	expression, parent));
	}
	catch (Exception e) {
	if (_xsltc.debug()) e.printStackTrace();
	reportError(ERROR, new ErrorMsg(ErrorMsg.XPATH_PARSER_ERR,
	expression, parent));
	}

	// Return a dummy pattern (which is an expression)
	SyntaxTreeNode.Dummy.setParser(this);
	return SyntaxTreeNode.Dummy;
	}

	/********************** ERROR HANDLING SECTION **********************/

	/**
	* Returns true if there were any errors during compilation
	*/
	public boolean errorsFound() {
	return _errors.size() > 0;
	}

	/**
	* Prints all compile-time errors
	*/
	public void printErrors() {
	final int size = _errors.size();
	if (size > 0) {
	System.err.println(new ErrorMsg(ErrorMsg.COMPILER_ERROR_KEY));
	for (int i = 0; i < size; i++) {
	System.err.println(" " + _errors.get(i));
	}
	}
	}

	/**
	* Prints all compile-time warnings
	*/
	public void printWarnings() {
	final int size = _warnings.size();
	if (size > 0) {
	System.err.println(new ErrorMsg(ErrorMsg.COMPILER_WARNING_KEY));
	for (int i = 0; i < size; i++) {
	System.err.println(" " + _warnings.get(i));
	}
	}
	}

	/**
	* Common error/warning message handler
	*/
	public void reportError(final int category, final ErrorMsg error) {
	switch (category) {
	case Constants.INTERNAL:
	// Unexpected internal errors, such as null-ptr exceptions, etc.
	// Immediately terminates compilation, no translet produced
	_errors.add(error);
	break;
	case Constants.UNSUPPORTED:
	// XSLT elements that are not implemented and unsupported ext.
	// Immediately terminates compilation, no translet produced
	_errors.add(error);
	break;
	case Constants.FATAL:
	// Fatal error in the stylesheet input (parsing or content)
	// Immediately terminates compilation, no translet produced
	_errors.add(error);
	break;
	case Constants.ERROR:
	// Other error in the stylesheet input (parsing or content)
	// Does not terminate compilation, no translet produced
	_errors.add(error);
	break;
	case Constants.WARNING:
	// Other error in the stylesheet input (content errors only)
	// Does not terminate compilation, a translet is produced
	_warnings.add(error);
	break;
	}
	}

	public ArrayList<ErrorMsg> getErrors() {
	return _errors;
	}

	public ArrayList<ErrorMsg> getWarnings() {
	return _warnings;
	}

	/********************** SAX2 ContentHandler INTERFACE ***************/

	private Stack<SyntaxTreeNode> _parentStack = null;
	private Map<String, String> _prefixMapping = null;

	/**
	* SAX2: Receive notification of the beginning of a document.
	*/
	public void startDocument() {
	_root = null;
	_target = null;
	_prefixMapping = null;
	_parentStack = new Stack<>();
	}

	/**
	* SAX2: Receive notification of the end of a document.
	*/
	public void endDocument() { }


	/**
	* SAX2: Begin the scope of a prefix-URI Namespace mapping.
	* This has to be passed on to the symbol table!
	*/
	public void startPrefixMapping(String prefix, String uri) {
	if (_prefixMapping == null) {
	_prefixMapping = new HashMap<>();
	}
	_prefixMapping.put(prefix, uri);
	}

	/**
	* SAX2: End the scope of a prefix-URI Namespace mapping.
	* This has to be passed on to the symbol table!
	*/
	public void endPrefixMapping(String prefix) { }

	/**
	* SAX2: Receive notification of the beginning of an element.
	* The parser may re-use the attribute list that we're passed so
	* we clone the attributes in our own Attributes implementation
	*/
	public void startElement(String uri, String localname,
	String qname, Attributes attributes)
	throws SAXException {
	final int col = qname.lastIndexOf(':');
	final String prefix = (col == -1) ? null : qname.substring(0, col);

	SyntaxTreeNode element = makeInstance(uri, prefix,
	localname, attributes);
	if (element == null) {
	ErrorMsg err = new ErrorMsg(ErrorMsg.ELEMENT_PARSE_ERR,
	prefix+':'+localname);
	throw new SAXException(err.toString());
	}

	// If this is the root element of the XML document we need to make sure
	// that it contains a definition of the XSL namespace URI
	if (_root == null) {
	if ((_prefixMapping == null) \|\|
	(_prefixMapping.containsValue(Constants.XSLT_URI) == false))
	_rootNamespaceDef = false;
	else
	_rootNamespaceDef = true;
	_root = element;
	}
	else {
	SyntaxTreeNode parent = _parentStack.peek();

	if (element.getClass().isAssignableFrom(Import.class) &&
	parent.notTypeOf(Import.class)) {
	ErrorMsg err = new ErrorMsg(ErrorMsg.IMPORT_PRECEDE_OTHERS_ERR,
	prefix+':'+localname);
	throw new SAXException(err.toString());
	}

	parent.addElement(element);
	element.setParent(parent);
	}
	element.setAttributes(new AttributesImpl(attributes));
	element.setPrefixMapping(_prefixMapping);

	if (element instanceof Stylesheet) {
	// Extension elements and excluded elements have to be
	// handled at this point in order to correctly generate
	// Fallback elements from <xsl:fallback>s.
	getSymbolTable().setCurrentNode(element);
	((Stylesheet)element).declareExtensionPrefixes(this);
	}

	_prefixMapping = null;
	_parentStack.push(element);
	}

	/**
	* SAX2: Receive notification of the end of an element.
	*/
	public void endElement(String uri, String localname, String qname) {
	_parentStack.pop();
	}

	/**
	* SAX2: Receive notification of character data.
	*/
	public void characters(char[] ch, int start, int length) {
	String string = new String(ch, start, length);
	SyntaxTreeNode parent = _parentStack.peek();

	if (string.length() == 0) return;

	// If this text occurs within an <xsl:text> element we append it
	// as-is to the existing text element
	if (parent instanceof Text) {
	((Text)parent).setText(string);
	return;
	}

	// Ignore text nodes that occur directly under <xsl:stylesheet>
	if (parent instanceof Stylesheet) return;

	SyntaxTreeNode bro = parent.lastChild();
	if ((bro != null) && (bro instanceof Text)) {
	Text text = (Text)bro;
	if (!text.isTextElement()) {
	if ((length > 1) \|\| ( ((int)ch[0]) < 0x100)) {
	text.setText(string);
	return;
	}
	}
	}

	// Add it as a regular text node otherwise
	parent.addElement(new Text(string));
	}

	private String getTokenValue(String token) {
	final int start = token.indexOf('"');
	final int stop = token.lastIndexOf('"');
	return token.substring(start+1, stop);
	}

	/**
	* SAX2: Receive notification of a processing instruction.
	* These require special handling for stylesheet PIs.
	*/
	public void processingInstruction(String name, String value) {
	// We only handle the <?xml-stylesheet ...?> PI
	if ((_target == null) && (name.equals("xml-stylesheet"))) {

	String href = null; // URI of stylesheet found
	String media = null; // Media of stylesheet found
	String title = null; // Title of stylesheet found
	String charset = null; // Charset of stylesheet found

	// Get the attributes from the processing instruction
	StringTokenizer tokens = new StringTokenizer(value);
	while (tokens.hasMoreElements()) {
	String token = (String)tokens.nextElement();
	if (token.startsWith("href"))
	href = getTokenValue(token);
	else if (token.startsWith("media"))
	media = getTokenValue(token);
	else if (token.startsWith("title"))
	title = getTokenValue(token);
	else if (token.startsWith("charset"))
	charset = getTokenValue(token);
	}

	// Set the target to this PI's href if the parameters are
	// null or match the corresponding attributes of this PI.
	if ( ((_PImedia == null) \|\| (_PImedia.equals(media))) &&
	((_PItitle == null) \|\| (_PImedia.equals(title))) &&
	((_PIcharset == null) \|\| (_PImedia.equals(charset))) ) {
	_target = href;
	}
	}
	}

	/**
	* IGNORED - all ignorable whitespace is ignored
	*/
	public void ignorableWhitespace(char[] ch, int start, int length) { }

	/**
	* IGNORED - we do not have to do anything with skipped entities
	*/
	public void skippedEntity(String name) { }

	/**
	* Store the document locator to later retrieve line numbers of all
	* elements from the stylesheet
	*/
	public void setDocumentLocator(Locator locator) {
	_locator = locator;
	}

	/**
	* Get the line number, or zero
	* if there is no _locator.
	*/
	private int getLineNumber() {
	int line = 0;
	if (_locator != null)
	line = _locator.getLineNumber();
	return line;
	}

	}

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