/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2001-2004 The Apache Software Foundation.  
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 2002, International
 * Business Machines, Inc., http://www.apache.org.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */


package com.sun.org.apache.xerces.internal.parsers;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Locale;

import com.sun.org.apache.xerces.internal.impl.Constants;
import com.sun.org.apache.xerces.internal.impl.XML11DTDScannerImpl;
import com.sun.org.apache.xerces.internal.impl.XML11DocumentScannerImpl;
import com.sun.org.apache.xerces.internal.impl.XML11NSDocumentScannerImpl;
import com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl;
import com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl;
import com.sun.org.apache.xerces.internal.impl.XMLEntityHandler;
import com.sun.org.apache.xerces.internal.impl.XMLEntityManager;
import com.sun.org.apache.xerces.internal.impl.XMLErrorReporter;
import com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl;
import com.sun.org.apache.xerces.internal.impl.XMLVersionDetector;
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.XML11NSDTDValidator;
import com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDProcessor;
import com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator;
import com.sun.org.apache.xerces.internal.impl.dtd.XMLNSDTDValidator;
import com.sun.org.apache.xerces.internal.impl.dv.DTDDVFactory;
import com.sun.org.apache.xerces.internal.impl.msg.XMLMessageFormatter;
import com.sun.org.apache.xerces.internal.impl.validation.ValidationManager;
import com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator;
import com.sun.org.apache.xerces.internal.impl.xs.XSMessageFormatter;
import com.sun.org.apache.xerces.internal.util.ParserConfigurationSettings;
import com.sun.org.apache.xerces.internal.util.SymbolTable;
import com.sun.org.apache.xerces.internal.xni.XMLDTDContentModelHandler;
import com.sun.org.apache.xerces.internal.xni.XMLDTDHandler;
import com.sun.org.apache.xerces.internal.xni.XMLDocumentHandler;
import com.sun.org.apache.xerces.internal.xni.XMLLocator;
import com.sun.org.apache.xerces.internal.xni.XNIException;
import com.sun.org.apache.xerces.internal.xni.grammars.XMLGrammarPool;
import com.sun.org.apache.xerces.internal.xni.parser.XMLComponent;
import com.sun.org.apache.xerces.internal.xni.parser.XMLComponentManager;
import com.sun.org.apache.xerces.internal.xni.parser.XMLConfigurationException;
import com.sun.org.apache.xerces.internal.xni.parser.XMLDTDScanner;
import com.sun.org.apache.xerces.internal.xni.parser.XMLDocumentScanner;
import com.sun.org.apache.xerces.internal.xni.parser.XMLDocumentSource;
import com.sun.org.apache.xerces.internal.xni.parser.XMLEntityResolver;
import com.sun.org.apache.xerces.internal.xni.parser.XMLErrorHandler;
import com.sun.org.apache.xerces.internal.xni.parser.XMLInputSource;
import com.sun.org.apache.xerces.internal.xni.parser.XMLPullParserConfiguration;

/**
 * This class is the configuration used to parse XML 1.0 and XML 1.1 documents.
 * This is the default Xerces configuration.
 *
 * @author Elena Litani, IBM
 * @author Neil Graham, IBM
 * @author Michael Glavassevich, IBM
 *
 * @version $Id: XML11Configuration.java,v 1.17 2004/04/12 21:56:02 mrglavas Exp $
 */
public class XML11Configuration extends ParserConfigurationSettings
implements XMLPullParserConfiguration {
    
    //
    // Constants
    //
    protected final static String XML11_DATATYPE_VALIDATOR_FACTORY =
    "com.sun.org.apache.xerces.internal.impl.dv.dtd.XML11DTDDVFactoryImpl";
    
    // feature identifiers
    
    /** Feature identifier: warn on duplicate attribute definition. */
    protected static final String WARN_ON_DUPLICATE_ATTDEF =
    Constants.XERCES_FEATURE_PREFIX + Constants.WARN_ON_DUPLICATE_ATTDEF_FEATURE;
    
    /** Feature identifier: warn on duplicate entity definition. */
    protected static final String WARN_ON_DUPLICATE_ENTITYDEF =
    Constants.XERCES_FEATURE_PREFIX + Constants.WARN_ON_DUPLICATE_ENTITYDEF_FEATURE;
    
    /** Feature identifier: warn on undeclared element definition. */
    protected static final String WARN_ON_UNDECLARED_ELEMDEF =
    Constants.XERCES_FEATURE_PREFIX + Constants.WARN_ON_UNDECLARED_ELEMDEF_FEATURE;
    
    /** Feature identifier: allow Java encodings. */
    protected static final String ALLOW_JAVA_ENCODINGS =
    Constants.XERCES_FEATURE_PREFIX + Constants.ALLOW_JAVA_ENCODINGS_FEATURE;
    
    /** Feature identifier: continue after fatal error. */
    protected static final String CONTINUE_AFTER_FATAL_ERROR =
    Constants.XERCES_FEATURE_PREFIX + Constants.CONTINUE_AFTER_FATAL_ERROR_FEATURE;
    
    /** Feature identifier: load external DTD. */
    protected static final String LOAD_EXTERNAL_DTD =
    Constants.XERCES_FEATURE_PREFIX + Constants.LOAD_EXTERNAL_DTD_FEATURE;
    
    /** Feature identifier: notify built-in refereces. */
    protected static final String NOTIFY_BUILTIN_REFS =
    Constants.XERCES_FEATURE_PREFIX + Constants.NOTIFY_BUILTIN_REFS_FEATURE;
    
    /** Feature identifier: notify character refereces. */
    protected static final String NOTIFY_CHAR_REFS =
    Constants.XERCES_FEATURE_PREFIX + Constants.NOTIFY_CHAR_REFS_FEATURE;
    
    /** Feature identifier: expose schema normalized value */
    protected static final String NORMALIZE_DATA =
    Constants.XERCES_FEATURE_PREFIX + Constants.SCHEMA_NORMALIZED_VALUE;
    
    /** Feature identifier: send element default value via characters() */
    protected static final String SCHEMA_ELEMENT_DEFAULT =
    Constants.XERCES_FEATURE_PREFIX + Constants.SCHEMA_ELEMENT_DEFAULT;
    
    /** Feature identifier: augment PSVI */
    protected static final String SCHEMA_AUGMENT_PSVI =
    Constants.XERCES_FEATURE_PREFIX + Constants.SCHEMA_AUGMENT_PSVI;
    
    /** feature identifier: XML Schema validation */
    protected static final String XMLSCHEMA_VALIDATION =
    Constants.XERCES_FEATURE_PREFIX + Constants.SCHEMA_VALIDATION_FEATURE;
    
    /** feature identifier: XML Schema validation -- full checking */
    protected static final String XMLSCHEMA_FULL_CHECKING =
    Constants.XERCES_FEATURE_PREFIX + Constants.SCHEMA_FULL_CHECKING;
    
    // feature identifiers
    
    /** Feature identifier: validation. */
    protected static final String VALIDATION =
    Constants.SAX_FEATURE_PREFIX + Constants.VALIDATION_FEATURE;
    
    /** Feature identifier: namespaces. */
    protected static final String NAMESPACES =
    Constants.SAX_FEATURE_PREFIX + Constants.NAMESPACES_FEATURE;
    
    /** Feature identifier: external general entities. */
    protected static final String EXTERNAL_GENERAL_ENTITIES =
    Constants.SAX_FEATURE_PREFIX + Constants.EXTERNAL_GENERAL_ENTITIES_FEATURE;
    
    /** Feature identifier: external parameter entities. */
    protected static final String EXTERNAL_PARAMETER_ENTITIES =
    Constants.SAX_FEATURE_PREFIX + Constants.EXTERNAL_PARAMETER_ENTITIES_FEATURE;
    
    protected static final String EXPAND_URIS = Constants.SAX_FEATURE_PREFIX + Constants.RESOLVE_DTD_URIS_FEATURE;
    protected static final String XML_VERSION_SUPPORT = Constants.SAX_FEATURE_PREFIX + Constants.XML_11_FEATURE;
    protected static final String NORMALIZAION_CHECKS =  Constants.SAX_FEATURE_PREFIX +  Constants.UNICODE_NORMALIZATION_CHECKING_FEATURE;
    
    // property identifiers
    
    
    /** Property identifier: xml string. */
    protected static final String XML_STRING =
    Constants.SAX_PROPERTY_PREFIX + Constants.XML_STRING_PROPERTY;
    
    /** Property identifier: symbol table. */
    protected static final String SYMBOL_TABLE =
    Constants.XERCES_PROPERTY_PREFIX + Constants.SYMBOL_TABLE_PROPERTY;
    
    /** Property identifier: error handler. */
    protected static final String ERROR_HANDLER =
    Constants.XERCES_PROPERTY_PREFIX + Constants.ERROR_HANDLER_PROPERTY;
    
    /** Property identifier: entity resolver. */
    protected static final String ENTITY_RESOLVER =
    Constants.XERCES_PROPERTY_PREFIX + Constants.ENTITY_RESOLVER_PROPERTY;
    
    
    /** Property identifier: XML Schema validator. */
    protected static final String SCHEMA_VALIDATOR =
    Constants.XERCES_PROPERTY_PREFIX + Constants.SCHEMA_VALIDATOR_PROPERTY;
    
    /** Property identifier: schema location. */
    protected static final String SCHEMA_LOCATION =
    Constants.XERCES_PROPERTY_PREFIX + Constants.SCHEMA_LOCATION;
    
    /** Property identifier: no namespace schema location. */
    protected static final String SCHEMA_NONS_LOCATION =
    Constants.XERCES_PROPERTY_PREFIX + Constants.SCHEMA_NONS_LOCATION;
    
    // property identifiers
    
    /** Property identifier: error reporter. */
    protected static final String ERROR_REPORTER =
    Constants.XERCES_PROPERTY_PREFIX + Constants.ERROR_REPORTER_PROPERTY;
    
    /** Property identifier: entity manager. */
    protected static final String ENTITY_MANAGER =
    Constants.XERCES_PROPERTY_PREFIX + Constants.ENTITY_MANAGER_PROPERTY;
    
    /** Property identifier document scanner: */
    protected static final String DOCUMENT_SCANNER =
    Constants.XERCES_PROPERTY_PREFIX + Constants.DOCUMENT_SCANNER_PROPERTY;
    
    /** Property identifier: DTD scanner. */
    protected static final String DTD_SCANNER =
    Constants.XERCES_PROPERTY_PREFIX + Constants.DTD_SCANNER_PROPERTY;
    
    /** Property identifier: grammar pool. */
    protected static final String XMLGRAMMAR_POOL =
    Constants.XERCES_PROPERTY_PREFIX + Constants.XMLGRAMMAR_POOL_PROPERTY;
    
    /** Property identifier: DTD loader. */
    protected static final String DTD_PROCESSOR =
    Constants.XERCES_PROPERTY_PREFIX + Constants.DTD_PROCESSOR_PROPERTY;
    
    /** Property identifier: DTD validator. */
    protected static final String DTD_VALIDATOR =
    Constants.XERCES_PROPERTY_PREFIX + Constants.DTD_VALIDATOR_PROPERTY;
    
    /** Property identifier: namespace binder. */
    protected static final String NAMESPACE_BINDER =
    Constants.XERCES_PROPERTY_PREFIX + Constants.NAMESPACE_BINDER_PROPERTY;
    
    /** Property identifier: datatype validator factory. */
    protected static final String DATATYPE_VALIDATOR_FACTORY =
    Constants.XERCES_PROPERTY_PREFIX + Constants.DATATYPE_VALIDATOR_FACTORY_PROPERTY;
    
    protected static final String VALIDATION_MANAGER =
    Constants.XERCES_PROPERTY_PREFIX + Constants.VALIDATION_MANAGER_PROPERTY;
    
    /** Property identifier: JAXP schema language / DOM schema-type. */
    protected static final String JAXP_SCHEMA_LANGUAGE =
    Constants.JAXP_PROPERTY_PREFIX + Constants.SCHEMA_LANGUAGE;
    
    /** Property identifier: JAXP schema source/ DOM schema-location. */
    protected static final String JAXP_SCHEMA_SOURCE =
    Constants.JAXP_PROPERTY_PREFIX + Constants.SCHEMA_SOURCE;
    
    
    // debugging
    
    /** Set to true and recompile to print exception stack trace. */
    protected static final boolean PRINT_EXCEPTION_STACK_TRACE = false;
    
    //
    // Data
    //
    
    protected SymbolTable fSymbolTable;
    protected XMLInputSource fInputSource;
    protected ValidationManager fValidationManager;
    protected XMLVersionDetector fVersionDetector;
    protected XMLLocator fLocator;
    protected Locale fLocale;
    
    /** XML 1.0 Components. */
    protected ArrayList fComponents;
    
    /** XML 1.1. Components. */
    protected ArrayList fXML11Components = null;
    
    /** Common components: XMLEntityManager, XMLErrorReporter, XMLSchemaValidator */
    protected ArrayList fCommonComponents = null;
    
    /** The document handler. */
    protected XMLDocumentHandler fDocumentHandler;
    
    /** The DTD handler. */
    protected XMLDTDHandler fDTDHandler;
    
    /** The DTD content model handler. */
    protected XMLDTDContentModelHandler fDTDContentModelHandler;
    
    /** Last component in the document pipeline */
    protected XMLDocumentSource fLastComponent;
    
    /**
     * True if a parse is in progress. This state is needed because
     * some features/properties cannot be set while parsing (e.g.
     * validation and namespaces).
     */
    protected boolean fParseInProgress = false;
    
    /** fConfigUpdated is set to true if there has been any change to the configuration settings,
     * i.e a feature or a property was changed.
     */
    protected boolean fConfigUpdated = false;
    
    //
    // XML 1.0 components
    //
    
    /** The XML 1.0 Datatype validator factory. */
    protected DTDDVFactory fDatatypeValidatorFactory;
    
    /** The XML 1.0 Document scanner that does namespace binding. */
    protected XMLNSDocumentScannerImpl fNamespaceScanner;
    /** The XML 1.0 Non-namespace implementation of scanner */
    protected XMLDocumentScannerImpl fNonNSScanner;
    /** The XML 1.0 DTD Validator: binds namespaces */
    protected XMLDTDValidator fDTDValidator;
    /** The XML 1.0 DTD Validator that does not bind namespaces */
    protected XMLDTDValidator fNonNSDTDValidator;
    /** The XML 1.0 DTD scanner. */
    protected XMLDTDScanner fDTDScanner;
    /** The XML 1.0 DTD Processor . */
    protected XMLDTDProcessor fDTDProcessor;
    
    //
    // XML 1.1 components
    //
    
    /** The XML 1.1 datatype factory. **/
    protected DTDDVFactory fXML11DatatypeFactory = null;
    
    /** The XML 1.1 document scanner that does namespace binding. **/
    protected XML11NSDocumentScannerImpl fXML11NSDocScanner = null;
    
    /** The XML 1.1 document scanner that does not do namespace binding. **/
    protected XML11DocumentScannerImpl fXML11DocScanner = null;
    
    /** The XML 1.1 DTD validator that does namespace binding. **/
    protected XML11NSDTDValidator fXML11NSDTDValidator = null;
    
    /** The XML 1.1 DTD validator that does not do namespace binding. **/
    protected XML11DTDValidator fXML11DTDValidator = null;
    
    /** The XML 1.1 DTD scanner. **/
    protected XML11DTDScannerImpl fXML11DTDScanner = null;
    /** The XML 1.1 DTD processor. **/
    protected XML11DTDProcessor fXML11DTDProcessor = null;
    
    //
    // Common components
    //
    
    /** Grammar pool. */
    protected XMLGrammarPool fGrammarPool;
    
    /** Error reporter. */
    protected XMLErrorReporter fErrorReporter;
    
    /** Entity manager. */
    protected XMLEntityManager fEntityManager;
    
    /** XML Schema Validator. */
    protected XMLSchemaValidator fSchemaValidator;
    
    /** Current scanner */
    protected XMLDocumentScanner fCurrentScanner;
    /** Current Datatype validator factory. */
    protected DTDDVFactory fCurrentDVFactory;
    /** Current DTD scanner. */
    protected XMLDTDScanner fCurrentDTDScanner;
    
    /** Flag indiciating whether XML11 components have been initialized. */
    private boolean f11Initialized = false;
    
    //
    // Constructors
    //
    
    /** Default constructor. */
    public XML11Configuration() {
        this(null, null, null);
    } // <init>()
    
    /**
     * Constructs a parser configuration using the specified symbol table.
     *
     * @param symbolTable The symbol table to use.
     */
    public XML11Configuration(SymbolTable symbolTable) {
        this(symbolTable, null, null);
    } // <init>(SymbolTable)
    
    /**
     * Constructs a parser configuration using the specified symbol table and
     * grammar pool.
     * <p>
     * <strong>REVISIT:</strong>
     * Grammar pool will be updated when the new validation engine is
     * implemented.
     *
     * @param symbolTable The symbol table to use.
     * @param grammarPool The grammar pool to use.
     */
    public XML11Configuration(SymbolTable symbolTable, XMLGrammarPool grammarPool) {
        this(symbolTable, grammarPool, null);
    } // <init>(SymbolTable,XMLGrammarPool)
    
    /**
     * Constructs a parser configuration using the specified symbol table,
     * grammar pool, and parent settings.
     * <p>
     * <strong>REVISIT:</strong>
     * Grammar pool will be updated when the new validation engine is
     * implemented.
     *
     * @param symbolTable    The symbol table to use.
     * @param grammarPool    The grammar pool to use.
     * @param parentSettings The parent settings.
     */
    public XML11Configuration(
    SymbolTable symbolTable,
    XMLGrammarPool grammarPool,
    XMLComponentManager parentSettings) {
        
        super(parentSettings);
        
        // create a vector to hold all the components in use
        // XML 1.0 specialized components
        fComponents = new ArrayList();
        // XML 1.1 specialized components
        fXML11Components = new ArrayList();
        // Common components for XML 1.1. and XML 1.0
        fCommonComponents = new ArrayList();
        
        // create storage for recognized features and properties
        fRecognizedFeatures = new ArrayList();
        fRecognizedProperties = new ArrayList();
        
        // create table for features and properties
        fFeatures = new HashMap();
        fProperties = new HashMap();
        
        // add default recognized features
        final String[] recognizedFeatures = {
            CONTINUE_AFTER_FATAL_ERROR, LOAD_EXTERNAL_DTD, // from XMLDTDScannerImpl
            VALIDATION,
            NAMESPACES,
            NORMALIZE_DATA, SCHEMA_ELEMENT_DEFAULT, SCHEMA_AUGMENT_PSVI,
            // NOTE: These shouldn't really be here but since the XML Schema
            //       validator is constructed dynamically, its recognized
            //       features might not have been set and it would cause a
            //       not-recognized exception to be thrown. -Ac
            XMLSCHEMA_VALIDATION, XMLSCHEMA_FULL_CHECKING,
            EXTERNAL_GENERAL_ENTITIES,
            EXTERNAL_PARAMETER_ENTITIES,
            PARSER_SETTINGS,
            EXPAND_URIS,
            XML_VERSION_SUPPORT,
            NORMALIZAION_CHECKS
        };
        addRecognizedFeatures(recognizedFeatures);
        // set state for default features
        fFeatures.put(VALIDATION, Boolean.FALSE);
        fFeatures.put(NAMESPACES, Boolean.TRUE);
        fFeatures.put(EXTERNAL_GENERAL_ENTITIES, Boolean.TRUE);
        fFeatures.put(EXTERNAL_PARAMETER_ENTITIES, Boolean.TRUE);
        fFeatures.put(CONTINUE_AFTER_FATAL_ERROR, Boolean.FALSE);
        fFeatures.put(LOAD_EXTERNAL_DTD, Boolean.TRUE);
        fFeatures.put(SCHEMA_ELEMENT_DEFAULT, Boolean.TRUE);
        fFeatures.put(NORMALIZE_DATA, Boolean.TRUE);
        fFeatures.put(SCHEMA_AUGMENT_PSVI, Boolean.TRUE);
        fFeatures.put(PARSER_SETTINGS, Boolean.TRUE);
        fFeatures.put(EXPAND_URIS, Boolean.TRUE);
        fFeatures.put(XML_VERSION_SUPPORT, Boolean.TRUE);
        fFeatures.put(NORMALIZAION_CHECKS, Boolean.FALSE);
        // add default recognized properties
        final String[] recognizedProperties = {
            SYMBOL_TABLE,
            ERROR_HANDLER,
            ENTITY_RESOLVER,
            ERROR_REPORTER,
            ENTITY_MANAGER,
            DOCUMENT_SCANNER,
            DTD_SCANNER,
            DTD_PROCESSOR,
            DTD_VALIDATOR,
            DATATYPE_VALIDATOR_FACTORY,
            VALIDATION_MANAGER,
            SCHEMA_VALIDATOR,
            XML_STRING,
            XMLGRAMMAR_POOL,
            JAXP_SCHEMA_SOURCE,
            JAXP_SCHEMA_LANGUAGE,
            // NOTE: These shouldn't really be here but since the XML Schema
            //       validator is constructed dynamically, its recognized
            //       properties might not have been set and it would cause a
            //       not-recognized exception to be thrown. -Ac
            SCHEMA_LOCATION, SCHEMA_NONS_LOCATION, };
            addRecognizedProperties(recognizedProperties);
            
            if (symbolTable == null) {
                symbolTable = new SymbolTable();
            }
            fSymbolTable = symbolTable;
            fProperties.put(SYMBOL_TABLE, fSymbolTable);
            
            fGrammarPool = grammarPool;
            if (fGrammarPool != null) {
                fProperties.put(XMLGRAMMAR_POOL, fGrammarPool);
            }
            
            fEntityManager = new XMLEntityManager();
            fProperties.put(ENTITY_MANAGER, fEntityManager);
            addCommonComponent(fEntityManager);
            
            fErrorReporter = new XMLErrorReporter();
            fErrorReporter.setDocumentLocator(fEntityManager.getEntityScanner());
            fProperties.put(ERROR_REPORTER, fErrorReporter);
            addCommonComponent(fErrorReporter);
            
            fNamespaceScanner = new XMLNSDocumentScannerImpl();
            fProperties.put(DOCUMENT_SCANNER, fNamespaceScanner);
            addComponent((XMLComponent) fNamespaceScanner);
            
            fDTDScanner = new XMLDTDScannerImpl();
            fProperties.put(DTD_SCANNER, fDTDScanner);
            addComponent((XMLComponent) fDTDScanner);
            
            fDTDProcessor = new XMLDTDProcessor();
            fProperties.put(DTD_PROCESSOR, fDTDProcessor);
            addComponent((XMLComponent) fDTDProcessor);
            
            fDTDValidator = new XMLNSDTDValidator();
            fProperties.put(DTD_VALIDATOR, fDTDValidator);
            addComponent(fDTDValidator);
            
            fDatatypeValidatorFactory = DTDDVFactory.getInstance();
            fProperties.put(DATATYPE_VALIDATOR_FACTORY, fDatatypeValidatorFactory);
            
            fValidationManager = new ValidationManager();
            fProperties.put(VALIDATION_MANAGER, fValidationManager);
            
            fVersionDetector = new XMLVersionDetector();
            
            // add message formatters
            if (fErrorReporter.getMessageFormatter(XMLMessageFormatter.XML_DOMAIN) == null) {
                XMLMessageFormatter xmft = new XMLMessageFormatter();
                fErrorReporter.putMessageFormatter(XMLMessageFormatter.XML_DOMAIN, xmft);
                fErrorReporter.putMessageFormatter(XMLMessageFormatter.XMLNS_DOMAIN, xmft);
            }
            
            // set locale
            try {
                setLocale(Locale.getDefault());
            } catch (XNIException e) {
                // do nothing
                // REVISIT: What is the right thing to do? -Ac
            }
            
            fConfigUpdated = false;
            
    } // <init>(SymbolTable,XMLGrammarPool)
    
    //
    // Public methods
    //
    /**
     * Sets the input source for the document to parse.
     *
     * @param inputSource The document's input source.
     *
     * @exception XMLConfigurationException Thrown if there is a
     *                        configuration error when initializing the
     *                        parser.
     * @exception IOException Thrown on I/O error.
     *
     * @see #parse(boolean)
     */
    public void setInputSource(XMLInputSource inputSource)
    throws XMLConfigurationException, IOException {
        
        // REVISIT: this method used to reset all the components and
        //          construct the pipeline. Now reset() is called
        //          in parse (boolean) just before we parse the document
        //          Should this method still throw exceptions..?
        
        fInputSource = inputSource;
        
    } // setInputSource(XMLInputSource)
    
    /**
     * Set the locale to use for messages.
     *
     * @param locale The locale object to use for localization of messages.
     *
     * @exception XNIException Thrown if the parser does not support the
     *                         specified locale.
     */
    public void setLocale(Locale locale) throws XNIException {
        fLocale = locale;
        fErrorReporter.setLocale(locale);
    } // setLocale(Locale)
    /**
     * Sets the document handler on the last component in the pipeline
     * to receive information about the document.
     *
     * @param documentHandler   The document handler.
     */
    public void setDocumentHandler(XMLDocumentHandler documentHandler) {
        fDocumentHandler = documentHandler;
        if (fLastComponent != null) {
            fLastComponent.setDocumentHandler(fDocumentHandler);
            if (fDocumentHandler !=null){
                fDocumentHandler.setDocumentSource(fLastComponent);
            }
        }
    } // setDocumentHandler(XMLDocumentHandler)
    
    /** Returns the registered document handler. */
    public XMLDocumentHandler getDocumentHandler() {
        return fDocumentHandler;
    } // getDocumentHandler():XMLDocumentHandler
    
    /**
     * Sets the DTD handler.
     *
     * @param dtdHandler The DTD handler.
     */
    public void setDTDHandler(XMLDTDHandler dtdHandler) {
        fDTDHandler = dtdHandler;
    } // setDTDHandler(XMLDTDHandler)
    
    /** Returns the registered DTD handler. */
    public XMLDTDHandler getDTDHandler() {
        return fDTDHandler;
    } // getDTDHandler():XMLDTDHandler
    
    /**
     * Sets the DTD content model handler.
     *
     * @param handler The DTD content model handler.
     */
    public void setDTDContentModelHandler(XMLDTDContentModelHandler handler) {
        fDTDContentModelHandler = handler;
    } // setDTDContentModelHandler(XMLDTDContentModelHandler)
    
    /** Returns the registered DTD content model handler. */
    public XMLDTDContentModelHandler getDTDContentModelHandler() {
        return fDTDContentModelHandler;
    } // getDTDContentModelHandler():XMLDTDContentModelHandler
    
    /**
     * Sets the resolver used to resolve external entities. The EntityResolver
     * interface supports resolution of public and system identifiers.
     *
     * @param resolver The new entity resolver. Passing a null value will
     *                 uninstall the currently installed resolver.
     */
    public void setEntityResolver(XMLEntityResolver resolver) {
        fProperties.put(ENTITY_RESOLVER, resolver);
    } // setEntityResolver(XMLEntityResolver)
    
    /**
     * Return the current entity resolver.
     *
     * @return The current entity resolver, or null if none
     *         has been registered.
     * @see #setEntityResolver
     */
    public XMLEntityResolver getEntityResolver() {
        return (XMLEntityResolver)fProperties.get(ENTITY_RESOLVER);
    } // getEntityResolver():XMLEntityResolver
    
    /**
     * Allow an application to register an error event handler.
     *
     * <p>If the application does not register an error handler, all
     * error events reported by the SAX parser will be silently
     * ignored; however, normal processing may not continue.  It is
     * highly recommended that all SAX applications implement an
     * error handler to avoid unexpected bugs.</p>
     *
     * <p>Applications may register a new or different handler in the
     * middle of a parse, and the SAX parser must begin using the new
     * handler immediately.</p>
     *
     * @param errorHandler The error handler.
     * @exception java.lang.NullPointerException If the handler
     *            argument is null.
     * @see #getErrorHandler
     */
    public void setErrorHandler(XMLErrorHandler errorHandler) {
        fProperties.put(ERROR_HANDLER, errorHandler);
    } // setErrorHandler(XMLErrorHandler)
    
    /**
     * Return the current error handler.
     *
     * @return The current error handler, or null if none
     *         has been registered.
     * @see #setErrorHandler
     */
    public XMLErrorHandler getErrorHandler() {
        // REVISIT: Should this be a property?
        return (XMLErrorHandler)fProperties.get(ERROR_HANDLER);
    } // getErrorHandler():XMLErrorHandler
    
    
    /**
     * If the application decides to terminate parsing before the xml document
     * is fully parsed, the application should call this method to free any
     * resource allocated during parsing. For example, close all opened streams.
     */
    public void cleanup() {
        fEntityManager.closeReaders();
    }
    
    /**
     * Parses the specified input source.
     *
     * @param source The input source.
     *
     * @exception XNIException Throws exception on XNI error.
     * @exception java.io.IOException Throws exception on i/o error.
     */
    public void parse(XMLInputSource source) throws XNIException, IOException {
        
        if (fParseInProgress) {
            // REVISIT - need to add new error message
            throw new XNIException("FWK005 parse may not be called while parsing.");
        }
        fParseInProgress = true;
        
        try {
            setInputSource(source);
            parse(true);
        } catch (XNIException ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw ex;
        } catch (IOException ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw ex;
        } catch (RuntimeException ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw ex;
        } catch (Exception ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw new XNIException(ex);
        } finally {
            fParseInProgress = false;
            // close all streams opened by xerces
            this.cleanup();
        }
        
    } // parse(InputSource)
    
    public boolean parse(boolean complete) throws XNIException, IOException {
        //
        // reset and configure pipeline and set InputSource.
        if (fInputSource != null) {
            try {
                fValidationManager.reset();
                fVersionDetector.reset(this);
                resetCommon();
                
                short version = fVersionDetector.determineDocVersion(fInputSource);
                if (version == Constants.XML_VERSION_1_1) {
                    initXML11Components();
                    configureXML11Pipeline();
                    resetXML11();
                } else {
                    configurePipeline();
                    reset();
                }
                
                // mark configuration as fixed
                fConfigUpdated = false;
                
                // resets and sets the pipeline.
                fVersionDetector.startDocumentParsing((XMLEntityHandler) fCurrentScanner, version);
                fInputSource = null;
            } catch (XNIException ex) {
                if (PRINT_EXCEPTION_STACK_TRACE)
                    ex.printStackTrace();
                throw ex;
            } catch (IOException ex) {
                if (PRINT_EXCEPTION_STACK_TRACE)
                    ex.printStackTrace();
                throw ex;
            } catch (RuntimeException ex) {
                if (PRINT_EXCEPTION_STACK_TRACE)
                    ex.printStackTrace();
                throw ex;
            } catch (Exception ex) {
                if (PRINT_EXCEPTION_STACK_TRACE)
                    ex.printStackTrace();
                throw new XNIException(ex);
            }
        }
        
        try {
            return fCurrentScanner.scanDocument(complete);
        } catch (XNIException ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw ex;
        } catch (IOException ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw ex;
        } catch (RuntimeException ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw ex;
        } catch (Exception ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw new XNIException(ex);
        }
        
    } // parse(boolean):boolean
    
    /**
     * Returns the state of a feature.
     *
     * @param featureId The feature identifier.
     * @return true if the feature is supported
     *
     * @throws XMLConfigurationException Thrown for configuration error.
     *                                   In general, components should
     *                                   only throw this exception if
     *                                   it is <strong>really</strong>
     *                                   a critical error.
     */
    public boolean getFeature(String featureId)
    throws XMLConfigurationException {
        // make this feature special
        if (featureId.equals(PARSER_SETTINGS)){
            return fConfigUpdated;
        }
        return super.getFeature(featureId);
        
    } // getFeature(String):boolean
    
    /**
     * Set the state of a feature.
     *
     * Set the state of any feature in a SAX2 parser.  The parser
     * might not recognize the feature, and if it does recognize
     * it, it might not be able to fulfill the request.
     *
     * @param featureId The unique identifier (URI) of the feature.
     * @param state The requested state of the feature (true or false).
     *
     * @exception com.sun.org.apache.xerces.internal.xni.parser.XMLConfigurationException If the
     *            requested feature is not known.
     */
    public void setFeature(String featureId, boolean state)
    throws XMLConfigurationException {
        fConfigUpdated = true;
        // forward to every XML 1.0 component
        int count = fComponents.size();
        for (int i = 0; i < count; i++) {
            XMLComponent c = (XMLComponent) fComponents.get(i);
            c.setFeature(featureId, state);
        }
        // forward it to common components
        count = fCommonComponents.size();
        for (int i = 0; i < count; i++) {
            XMLComponent c = (XMLComponent) fCommonComponents.get(i);
            c.setFeature(featureId, state);
        }
        
        // forward to every XML 1.1 component
        count = fXML11Components.size();
        for (int i = 0; i < count; i++) {
            XMLComponent c = (XMLComponent) fXML11Components.get(i);
            try{
                c.setFeature(featureId, state);
            }
            catch (Exception e){
                // no op
            }
        }
        // save state if noone "objects"
        super.setFeature(featureId, state);
        
    } // setFeature(String,boolean)
    
    /**
     * setProperty
     *
     * @param propertyId
     * @param value
     */
    public void setProperty(String propertyId, Object value)
    throws XMLConfigurationException {
        fConfigUpdated = true;
        // forward to every XML 1.0 component
        int count = fComponents.size();
        for (int i = 0; i < count; i++) {
            XMLComponent c = (XMLComponent) fComponents.get(i);
            c.setProperty(propertyId, value);
        }
        // forward it to every common Component
        count = fCommonComponents.size();
        for (int i = 0; i < count; i++) {
            XMLComponent c = (XMLComponent) fCommonComponents.get(i);
            c.setProperty(propertyId, value);
        }
        // forward it to every XML 1.1 component
        count = fXML11Components.size();
        for (int i = 0; i < count; i++) {
            XMLComponent c = (XMLComponent) fXML11Components.get(i);
            try{
                c.setProperty(propertyId, value);
            }
            catch (Exception e){
                // ignore it
            }
        }
        
        // store value if noone "objects"
        super.setProperty(propertyId, value);
        
    } // setProperty(String,Object)
    
    
    /** Returns the locale. */
    public Locale getLocale() {
        return fLocale;
    } // getLocale():Locale
    
    /**
     * reset all XML 1.0 components before parsing and namespace context
     */
    protected void reset() throws XNIException {
        int count = fComponents.size();
        for (int i = 0; i < count; i++) {
            XMLComponent c = (XMLComponent) fComponents.get(i);
            c.reset(this);
        }
        
    } // reset()
    
    /**
     * reset all common components before parsing
     */
    protected void resetCommon() throws XNIException {
        // reset common components
        int count = fCommonComponents.size();
        for (int i = 0; i < count; i++) {
            XMLComponent c = (XMLComponent) fCommonComponents.get(i);
            c.reset(this);
        }
        
    } // resetCommon()
    
    
    /**
     * reset all components before parsing and namespace context
     */
    protected void resetXML11() throws XNIException {
        // reset every component
        int count = fXML11Components.size();
        for (int i = 0; i < count; i++) {
            XMLComponent c = (XMLComponent) fXML11Components.get(i);
            c.reset(this);
        }
        
    } // resetXML11()
    
    
    /**
     *  Configures the XML 1.1 pipeline.
     *  Note: this method also resets the new XML11 components.
     */
    protected void configureXML11Pipeline() {
        if (fCurrentDVFactory != fXML11DatatypeFactory) {
            fCurrentDVFactory = fXML11DatatypeFactory;
            setProperty(DATATYPE_VALIDATOR_FACTORY, fCurrentDVFactory);
        }
        if (fCurrentDTDScanner != fXML11DTDScanner) {
            fCurrentDTDScanner = fXML11DTDScanner;
            setProperty(DTD_SCANNER, fCurrentDTDScanner);
            setProperty(DTD_PROCESSOR, fXML11DTDProcessor);
        }
        
        fXML11DTDScanner.setDTDHandler(fXML11DTDProcessor);
        fXML11DTDProcessor.setDTDSource(fXML11DTDScanner);
        fXML11DTDProcessor.setDTDHandler(fDTDHandler);
        if (fDTDHandler != null) {
            fDTDHandler.setDTDSource(fXML11DTDProcessor);
        }
        
        fXML11DTDScanner.setDTDContentModelHandler(fXML11DTDProcessor);
        fXML11DTDProcessor.setDTDContentModelSource(fXML11DTDScanner);
        fXML11DTDProcessor.setDTDContentModelHandler(fDTDContentModelHandler);
        if (fDTDContentModelHandler != null) {
            fDTDContentModelHandler.setDTDContentModelSource(fXML11DTDProcessor);
        }
        
        // setup XML 1.1 document pipeline
        if (fFeatures.get(NAMESPACES) == Boolean.TRUE) {
            if (fCurrentScanner != fXML11NSDocScanner) {
                fCurrentScanner = fXML11NSDocScanner;
                setProperty(DOCUMENT_SCANNER, fXML11NSDocScanner);
                setProperty(DTD_VALIDATOR, fXML11NSDTDValidator);
            }
            
            fXML11NSDocScanner.setDTDValidator(fXML11NSDTDValidator);
            fXML11NSDocScanner.setDocumentHandler(fXML11NSDTDValidator);
            fXML11NSDTDValidator.setDocumentSource(fXML11NSDocScanner);
            fXML11NSDTDValidator.setDocumentHandler(fDocumentHandler);
            
            if (fDocumentHandler != null) {
                fDocumentHandler.setDocumentSource(fXML11NSDTDValidator);
            }
            fLastComponent = fXML11NSDTDValidator;
            
        } else {
            // create components
            if (fXML11DocScanner == null) {
                // non namespace document pipeline
                fXML11DocScanner = new XML11DocumentScannerImpl();
                addXML11Component(fXML11DocScanner);
                fXML11DTDValidator = new XML11DTDValidator();
                addXML11Component(fXML11DTDValidator);
            }
            if (fCurrentScanner != fXML11DocScanner) {
                fCurrentScanner = fXML11DocScanner;
                setProperty(DOCUMENT_SCANNER, fXML11DocScanner);
                setProperty(DTD_VALIDATOR, fXML11DTDValidator);
            }
            fXML11DocScanner.setDocumentHandler(fXML11DTDValidator);
            fXML11DTDValidator.setDocumentSource(fXML11DocScanner);
            fXML11DTDValidator.setDocumentHandler(fDocumentHandler);
            
            if (fDocumentHandler != null) {
                fDocumentHandler.setDocumentSource(fXML11DTDValidator);
            }
            fLastComponent = fXML11DTDValidator;
        }
        
        // setup document pipeline
        if (fFeatures.get(XMLSCHEMA_VALIDATION) == Boolean.TRUE) {
            // If schema validator was not in the pipeline insert it.
            if (fSchemaValidator == null) {
                fSchemaValidator = new XMLSchemaValidator();
                // add schema component
                setProperty(SCHEMA_VALIDATOR, fSchemaValidator);
                addCommonComponent(fSchemaValidator);
                fSchemaValidator.reset(this);
                // add schema message formatter
                if (fErrorReporter.getMessageFormatter(XSMessageFormatter.SCHEMA_DOMAIN) == null) {
                    XSMessageFormatter xmft = new XSMessageFormatter();
                    fErrorReporter.putMessageFormatter(XSMessageFormatter.SCHEMA_DOMAIN, xmft);
                }
            }
            
            fLastComponent.setDocumentHandler(fSchemaValidator);
            fSchemaValidator.setDocumentSource(fLastComponent);
            fSchemaValidator.setDocumentHandler(fDocumentHandler);
            if (fDocumentHandler != null) {
                fDocumentHandler.setDocumentSource(fSchemaValidator);
            }
            fLastComponent = fSchemaValidator;
        }
        
    } // configureXML11Pipeline()
    
    /** Configures the pipeline. */
    protected void configurePipeline() {
        if (fCurrentDVFactory != fDatatypeValidatorFactory) {
            fCurrentDVFactory = fDatatypeValidatorFactory;
            // use XML 1.0 datatype library
            setProperty(DATATYPE_VALIDATOR_FACTORY, fCurrentDVFactory);
        }
        
        // setup DTD pipeline
        if (fCurrentDTDScanner != fDTDScanner) {
            fCurrentDTDScanner = fDTDScanner;
            setProperty(DTD_SCANNER, fCurrentDTDScanner);
            setProperty(DTD_PROCESSOR, fDTDProcessor);
        }
        fDTDScanner.setDTDHandler(fDTDProcessor);
        fDTDProcessor.setDTDSource(fDTDScanner);
        fDTDProcessor.setDTDHandler(fDTDHandler);
        if (fDTDHandler != null) {
            fDTDHandler.setDTDSource(fDTDProcessor);
        }
        
        fDTDScanner.setDTDContentModelHandler(fDTDProcessor);
        fDTDProcessor.setDTDContentModelSource(fDTDScanner);
        fDTDProcessor.setDTDContentModelHandler(fDTDContentModelHandler);
        if (fDTDContentModelHandler != null) {
            fDTDContentModelHandler.setDTDContentModelSource(fDTDProcessor);
        }
        
        // setup document pipeline
        if (fFeatures.get(NAMESPACES) == Boolean.TRUE) {
            if (fCurrentScanner != fNamespaceScanner) {
                fCurrentScanner = fNamespaceScanner;
                setProperty(DOCUMENT_SCANNER, fNamespaceScanner);
                setProperty(DTD_VALIDATOR, fDTDValidator);
            }
            fNamespaceScanner.setDTDValidator(fDTDValidator);
            fNamespaceScanner.setDocumentHandler(fDTDValidator);
            fDTDValidator.setDocumentSource(fNamespaceScanner);
            fDTDValidator.setDocumentHandler(fDocumentHandler);
            if (fDocumentHandler != null) {
                fDocumentHandler.setDocumentSource(fDTDValidator);
            }
            fLastComponent = fDTDValidator;
        } else {
            // create components
            if (fNonNSScanner == null) {
                fNonNSScanner = new XMLDocumentScannerImpl();
                fNonNSDTDValidator = new XMLDTDValidator();
                // add components
                addComponent((XMLComponent) fNonNSScanner);
                addComponent((XMLComponent) fNonNSDTDValidator);
            }
            if (fCurrentScanner != fNonNSScanner) {
                fCurrentScanner = fNonNSScanner;
                setProperty(DOCUMENT_SCANNER, fNonNSScanner);
                setProperty(DTD_VALIDATOR, fNonNSDTDValidator);
            }
            
            fNonNSScanner.setDocumentHandler(fNonNSDTDValidator);
            fNonNSDTDValidator.setDocumentSource(fNonNSScanner);
            fNonNSDTDValidator.setDocumentHandler(fDocumentHandler);
            if (fDocumentHandler != null) {
                fDocumentHandler.setDocumentSource(fNonNSDTDValidator);
            }
            fLastComponent = fNonNSDTDValidator;
        }
        
        // add XML Schema validator if needed
        if (fFeatures.get(XMLSCHEMA_VALIDATION) == Boolean.TRUE) {
            // If schema validator was not in the pipeline insert it.
            if (fSchemaValidator == null) {
                fSchemaValidator = new XMLSchemaValidator();
                // add schema component
                setProperty(SCHEMA_VALIDATOR, fSchemaValidator);
                addCommonComponent(fSchemaValidator);
                fSchemaValidator.reset(this);
                // add schema message formatter
                if (fErrorReporter.getMessageFormatter(XSMessageFormatter.SCHEMA_DOMAIN) == null) {
                    XSMessageFormatter xmft = new XSMessageFormatter();
                    fErrorReporter.putMessageFormatter(XSMessageFormatter.SCHEMA_DOMAIN, xmft);
                }
                
            }
            fLastComponent.setDocumentHandler(fSchemaValidator);
            fSchemaValidator.setDocumentSource(fLastComponent);
            fSchemaValidator.setDocumentHandler(fDocumentHandler);
            if (fDocumentHandler != null) {
                fDocumentHandler.setDocumentSource(fSchemaValidator);
            }
            fLastComponent = fSchemaValidator;
        }
    } // configurePipeline()
    
    
    // features and properties
    
    /**
     * Check a feature. If feature is know and supported, this method simply
     * returns. Otherwise, the appropriate exception is thrown.
     *
     * @param featureId The unique identifier (URI) of the feature.
     *
     * @throws XMLConfigurationException Thrown for configuration error.
     *                                   In general, components should
     *                                   only throw this exception if
     *                                   it is <strong>really</strong>
     *                                   a critical error.
     */
    protected void checkFeature(String featureId) throws XMLConfigurationException {
        
        //
        // Xerces Features
        //
        
        if (featureId.startsWith(Constants.XERCES_FEATURE_PREFIX)) {
            final int suffixLength = featureId.length() - Constants.XERCES_FEATURE_PREFIX.length();
            
            //
            // http://apache.org/xml/features/validation/dynamic
            //   Allows the parser to validate a document only when it
            //   contains a grammar. Validation is turned on/off based
            //   on each document instance, automatically.
            //
            if (suffixLength == Constants.DYNAMIC_VALIDATION_FEATURE.length() &&
            featureId.endsWith(Constants.DYNAMIC_VALIDATION_FEATURE)) {
                return;
            }
            
            //
            // http://apache.org/xml/features/validation/default-attribute-values
            //
            if (suffixLength == Constants.DEFAULT_ATTRIBUTE_VALUES_FEATURE.length() &&
            featureId.endsWith(Constants.DEFAULT_ATTRIBUTE_VALUES_FEATURE)) {
                // REVISIT
                short type = XMLConfigurationException.NOT_SUPPORTED;
                throw new XMLConfigurationException(type, featureId);
            }
            //
            // http://apache.org/xml/features/validation/default-attribute-values
            //
            if (suffixLength == Constants.VALIDATE_CONTENT_MODELS_FEATURE.length() &&
            featureId.endsWith(Constants.VALIDATE_CONTENT_MODELS_FEATURE)) {
                // REVISIT
                short type = XMLConfigurationException.NOT_SUPPORTED;
                throw new XMLConfigurationException(type, featureId);
            }
            //
            // http://apache.org/xml/features/validation/nonvalidating/load-dtd-grammar
            //
            if (suffixLength == Constants.LOAD_DTD_GRAMMAR_FEATURE.length() &&
            featureId.endsWith(Constants.LOAD_DTD_GRAMMAR_FEATURE)) {
                return;
            }
            //
            // http://apache.org/xml/features/validation/nonvalidating/load-external-dtd
            //
            if (suffixLength == Constants.LOAD_EXTERNAL_DTD_FEATURE.length() &&
            featureId.endsWith(Constants.LOAD_EXTERNAL_DTD_FEATURE)) {
                return;
            }
            
            //
            // http://apache.org/xml/features/validation/default-attribute-values
            //
            if (suffixLength == Constants.VALIDATE_DATATYPES_FEATURE.length() &&
            featureId.endsWith(Constants.VALIDATE_DATATYPES_FEATURE)) {
                short type = XMLConfigurationException.NOT_SUPPORTED;
                throw new XMLConfigurationException(type, featureId);
            }
            
            //
            // http://apache.org/xml/features/validation/schema
            //   Lets the user turn Schema validation support on/off.
            //
            if (suffixLength == Constants.SCHEMA_VALIDATION_FEATURE.length() &&
            featureId.endsWith(Constants.SCHEMA_VALIDATION_FEATURE)) {
                return;
            }
            // activate full schema checking
            if (suffixLength == Constants.SCHEMA_FULL_CHECKING.length() &&
            featureId.endsWith(Constants.SCHEMA_FULL_CHECKING)) {
                return;
            }
            // Feature identifier: expose schema normalized value
            //  http://apache.org/xml/features/validation/schema/normalized-value
            if (suffixLength == Constants.SCHEMA_NORMALIZED_VALUE.length() &&
            featureId.endsWith(Constants.SCHEMA_NORMALIZED_VALUE)) {
                return;
            }
            // Feature identifier: send element default value via characters()
            // http://apache.org/xml/features/validation/schema/element-default
            if (suffixLength == Constants.SCHEMA_ELEMENT_DEFAULT.length() &&
            featureId.endsWith(Constants.SCHEMA_ELEMENT_DEFAULT)) {
                return;
            }
            
            // special performance feature: only component manager is allowed to set it.
            if (suffixLength == Constants.PARSER_SETTINGS.length() &&
            featureId.endsWith(Constants.PARSER_SETTINGS)) {
                short type = XMLConfigurationException.NOT_SUPPORTED;
                throw new XMLConfigurationException(type, featureId);
            }
            
        }
        
        //
        // Not recognized
        //
        
        super.checkFeature(featureId);
        
    } // checkFeature(String)
    
    /**
     * Check a property. If the property is know and supported, this method
     * simply returns. Otherwise, the appropriate exception is thrown.
     *
     * @param propertyId The unique identifier (URI) of the property
     *                   being set.
     *
     * @throws XMLConfigurationException Thrown for configuration error.
     *                                   In general, components should
     *                                   only throw this exception if
     *                                   it is <strong>really</strong>
     *                                   a critical error.
     */
    protected void checkProperty(String propertyId) throws XMLConfigurationException {
        
        //
        // Xerces Properties
        //
        
        if (propertyId.startsWith(Constants.XERCES_PROPERTY_PREFIX)) {
            final int suffixLength = propertyId.length() - Constants.XERCES_PROPERTY_PREFIX.length();
            
            if (suffixLength == Constants.DTD_SCANNER_PROPERTY.length() &&
            propertyId.endsWith(Constants.DTD_SCANNER_PROPERTY)) {
                return;
            }
            if (suffixLength == Constants.SCHEMA_LOCATION.length() &&
            propertyId.endsWith(Constants.SCHEMA_LOCATION)) {
                return;
            }
            if (suffixLength == Constants.SCHEMA_NONS_LOCATION.length() &&
            propertyId.endsWith(Constants.SCHEMA_NONS_LOCATION)) {
                return;
            }
        }
        
        if (propertyId.startsWith(Constants.JAXP_PROPERTY_PREFIX)) {
            final int suffixLength = propertyId.length() - Constants.JAXP_PROPERTY_PREFIX.length();
            
            if (suffixLength == Constants.SCHEMA_SOURCE.length() &&
            propertyId.endsWith(Constants.SCHEMA_SOURCE)) {
                return;
            }
        }
        
        // special cases
        if (propertyId.startsWith(Constants.SAX_PROPERTY_PREFIX)) {
            final int suffixLength = propertyId.length() - Constants.SAX_PROPERTY_PREFIX.length();
            
            //
            // http://xml.org/sax/properties/xml-string
            // Value type: String
            // Access: read-only
            //   Get the literal string of characters associated with the
            //   current event.  If the parser recognises and supports this
            //   property but is not currently parsing text, it should return
            //   null (this is a good way to check for availability before the
            //   parse begins).
            //
            if (suffixLength == Constants.XML_STRING_PROPERTY.length() &&
            propertyId.endsWith(Constants.XML_STRING_PROPERTY)) {
                // REVISIT - we should probably ask xml-dev for a precise
                // definition of what this is actually supposed to return, and
                // in exactly which circumstances.
                short type = XMLConfigurationException.NOT_SUPPORTED;
                throw new XMLConfigurationException(type, propertyId);
            }
        }
        
        //
        // Not recognized
        //
        
        super.checkProperty(propertyId);
        
    } // checkProperty(String)
    
    
    /**
     * Adds a component to the parser configuration. This method will
     * also add all of the component's recognized features and properties
     * to the list of default recognized features and properties.
     *
     * @param component The component to add.
     */
    protected void addComponent(XMLComponent component) {
        
        // don't add a component more than once
        if (fComponents.contains(component)) {
            return;
        }
        fComponents.add(component);
        addRecognizedParamsAndSetDefaults(component);
        
    } // addComponent(XMLComponent)
    
    /**
     * Adds common component to the parser configuration. This method will
     * also add all of the component's recognized features and properties
     * to the list of default recognized features and properties.
     *
     * @param component The component to add.
     */
    protected void addCommonComponent(XMLComponent component) {
        
        // don't add a component more than once
        if (fCommonComponents.contains(component)) {
            return;
        }
        fCommonComponents.add(component);
        addRecognizedParamsAndSetDefaults(component);
        
    } // addCommonComponent(XMLComponent)
    
    /**
     * Adds an XML 1.1 component to the parser configuration. This method will
     * also add all of the component's recognized features and properties
     * to the list of default recognized features and properties.
     *
     * @param component The component to add.
     */
    protected void addXML11Component(XMLComponent component) {
        
        // don't add a component more than once
        if (fXML11Components.contains(component)) {
            return;
        }
        fXML11Components.add(component);
        addRecognizedParamsAndSetDefaults(component);
        
    } // addXML11Component(XMLComponent)
    
    /**
     * Adds all of the component's recognized features and properties
     * to the list of default recognized features and properties, and
     * sets default values on the configuration for features and
     * properties which were previously absent from the configuration.
     *
     * @param component The component whose recognized features
     * and properties will be added to the configuration
     */
    protected void addRecognizedParamsAndSetDefaults(XMLComponent component) {
        
        // register component's recognized features
        String[] recognizedFeatures = component.getRecognizedFeatures();
        addRecognizedFeatures(recognizedFeatures);
        
        // register component's recognized properties
        String[] recognizedProperties = component.getRecognizedProperties();
        addRecognizedProperties(recognizedProperties);
        
        // set default values
        if (recognizedFeatures != null) {
            for (int i = 0; i < recognizedFeatures.length; ++i) {
                String featureId = recognizedFeatures[i];
                Boolean state = component.getFeatureDefault(featureId);
                if (state != null) {
                    // Do not overwrite values already set on the configuration.
                    if (!fFeatures.containsKey(featureId)) {
                        fFeatures.put(featureId, state);
                        // For newly added components who recognize this feature
                        // but did not offer a default value, we need to make
                        // sure these components will get an opportunity to read
                        // the value before parsing begins.
                        fConfigUpdated = true;
                    }
                }
            }
        }
        if (recognizedProperties != null) {
            for (int i = 0; i < recognizedProperties.length; ++i) {
                String propertyId = recognizedProperties[i];
                Object value = component.getPropertyDefault(propertyId);
                if (value != null) {
                    // Do not overwrite values already set on the configuration.
                    if (!fProperties.containsKey(propertyId)) {
                        fProperties.put(propertyId, value);
                        // For newly added components who recognize this property
                        // but did not offer a default value, we need to make
                        // sure these components will get an opportunity to read
                        // the value before parsing begins.
                        fConfigUpdated = true;
                    }
                }
            }
        }
    }
    
    private void initXML11Components() {
        if (!f11Initialized) {
            
            // create datatype factory
            fXML11DatatypeFactory = DTDDVFactory.getInstance(XML11_DATATYPE_VALIDATOR_FACTORY);
            
            // setup XML 1.1 DTD pipeline
            fXML11DTDScanner = new XML11DTDScannerImpl();
            addXML11Component(fXML11DTDScanner);
            fXML11DTDProcessor = new XML11DTDProcessor();
            addXML11Component(fXML11DTDProcessor);
            
            // setup XML 1.1. document pipeline - namespace aware
            fXML11NSDocScanner = new XML11NSDocumentScannerImpl();
            addXML11Component(fXML11NSDocScanner);
            fXML11NSDTDValidator = new XML11NSDTDValidator();
            addXML11Component(fXML11NSDTDValidator);
            
            f11Initialized = true;
        }
    }
    
} // class XML11Configuration