/*
* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* This component and the accompanying materials are made available
* under the terms of the License "Eclipse Public License v1.0"
* which accompanies this distribution, and is available
* at the URL "http://www.eclipse.org/legal/epl-v10.html".
*
* Initial Contributors:
* Nokia Corporation - initial contribution.
*
* Contributors:
*
* Description: 
*
*/
/*
 * 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.
 */

/*
 * $Id: SAX2XMLReaderImpl.hpp 569031 2007-08-23 15:05:28Z amassari $
 */

#if !defined(SAX2XMLReaderImpl_HPP)
#define SAX2XMLReaderImpl_HPP

#include <xercesc/parsers/SAXParser.hpp>
#include <xercesc/sax/Parser.hpp>
#include <xercesc/framework/XMLBuffer.hpp>
#include <xercesc/internal/VecAttributesImpl.hpp>
#include <xercesc/sax2/SAX2XMLReader.hpp>
#include <xercesc/util/RefStackOf.hpp>
#include <xercesc/util/SecurityManager.hpp>
#include <xercesc/util/ValueStackOf.hpp>

XERCES_CPP_NAMESPACE_BEGIN


class ContentHandler;
class LexicalHandler;
class DeclHandler;
class GrammarResolver;
class XMLGrammarPool;
class XMLResourceIdentifier;
class PSVIHandler;

/**
  * This class implements the SAX2 'XMLReader' interface and should be
  * used by applications wishing to parse the XML files using SAX2.
  * It allows the client program to install SAX2 handlers for event
  * callbacks.
  *
  * <p>It can be used to instantiate a validating or non-validating
  * parser, by setting a member flag.</p>
  *
  * we basically re-use the existing SAX1 parser code, but provide a
  * new implementation of XMLContentHandler that raises the new
  * SAX2 style events
  *
  */

class PARSERS_EXPORT SAX2XMLReaderImpl :
	public XMemory
    , public SAX2XMLReader
    , public XMLDocumentHandler
    , public XMLErrorReporter
    , public XMLEntityHandler
    , public DocTypeHandler
{
public :
    // -----------------------------------------------------------------------
    //  Constructors and Destructor
    // -----------------------------------------------------------------------
    /** @name Constructors and Destructor */
    //@{
    /** The default constructor */
	SAX2XMLReaderImpl(
                            MemoryManager* const  manager = XMLPlatformUtils::fgMemoryManager
                          , XMLGrammarPool* const gramPool = 0 
                          );

    /** The destructor */	
	~SAX2XMLReaderImpl() ;
   //@}

    //-----------------------------------------------------------------------
    // Implementation of SAX2XMLReader Interface
    //-----------------------------------------------------------------------
    //-----------------------------------------------------------------------
    // The XMLReader interface
    //-----------------------------------------------------------------------
    /** @name Implementation of SAX 2.0 XMLReader interface's. */
    //@{

    /**
      * This method returns the installed content handler.
      *
      * @return A pointer to the installed content handler object.
      */
    virtual ContentHandler* getContentHandler() const ;

    /**
      * This method returns the installed DTD handler.
      *
      * @return A pointer to the installed DTD handler object.
      */
    virtual DTDHandler* getDTDHandler() const ;

    /**
      * This method returns the installed entity resolver.
      *
      * @return A pointer to the installed entity resolver object.
      */
    virtual EntityResolver* getEntityResolver() const ;

    /**
      * This method returns the installed entity resolver.
      *
      * @return A pointer to the installed entity resolver object.
      */
    virtual XMLEntityResolver* getXMLEntityResolver() const ;

    /**
      * This method returns the installed error handler.
      *
      * @return A pointer to the installed error handler object.
      */
    virtual ErrorHandler* getErrorHandler() const ;

    /**
      * This method returns the installed PSVI handler.
      *
      * @return A pointer to the installed PSVI handler object.
      */
    virtual PSVIHandler* getPSVIHandler() const ;

	/**
     * Query the current state of any feature in a SAX2 XMLReader.
	  *
	  * @param name The unique identifier (URI) of the feature being set.
	  * @return The current state of the feature.
     * @exception SAXNotRecognizedException If the requested feature is not known.
	  */
	virtual bool getFeature(const XMLCh* const name) const ;

	/**
     * Query the current value of a property in a SAX2 XMLReader.
     *
     * The parser owns the returned pointer.  The memory allocated for
     * the returned pointer will be destroyed when the parser is deleted.
     *
     * To ensure assessiblity of the returned information after the parser
     * is deleted, callers need to copy and store the returned information
     * somewhere else; otherwise you may get unexpected result.  Since the returned
     * pointer is a generic void pointer, see
     * http://xerces.apache.org/xerces-c/program-sax2.html#SAX2Properties to learn
     * exactly what type of property value each property returns for replication.
     *
     * @param name The unique identifier (URI) of the property being set.
     * @return     The current value of the property.  The pointer spans the same
     *             life-time as the parser.  A null pointer is returned if nothing
     *             was specified externally.
     * @exception  SAXNotRecognizedException If the requested property is not known.
     */
	virtual void* getProperty(const XMLCh* const name) const ;

  /**
    * Allow an application to register a document event handler.
    *
    * If the application does not register a document handler, all
    * document events reported by the SAX parser will be silently
    * ignored (this is the default behaviour implemented by
    * HandlerBase).
    *
    * 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.
    *
    * @param handler The document handler.
    * @see DocumentHandler#DocumentHandler
    * @see HandlerBase#HandlerBase
    */
    virtual void setContentHandler(ContentHandler* const handler) ;

  /**
    * Allow an application to register a DTD event handler.
    *
    * If the application does not register a DTD handler, all DTD
    * events reported by the SAX parser will be silently ignored (this
    * is the default behaviour implemented by HandlerBase).
    *
    * 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.
    *
    * @param handler The DTD handler.
    * @see DTDHandler#DTDHandler
    * @see HandlerBase#HandlerBase
    */
    virtual void setDTDHandler(DTDHandler* const handler) ;

  /**
    * Allow an application to register a custom entity resolver.
    *
    * If the application does not register an entity resolver, the
    * SAX parser will resolve system identifiers and open connections
    * to entities itself (this is the default behaviour implemented in
    * DefaultHandler).
    *
    * Applications may register a new or different entity resolver
    * in the middle of a parse, and the SAX parser must begin using
    * the new resolver immediately.
    *
    * <i>Any previously set entity resolver is merely dropped, since the parser
    * does not own them.  If both setEntityResolver and setXMLEntityResolver
    * are called, then the last one is used.</i>
    *
    * @param resolver The object for resolving entities.
    * @see EntityResolver#EntityResolver
    * @see DefaultHandler#DefaultHandler
    */
    virtual void setEntityResolver(EntityResolver* const resolver) ;
    
  /** Set the entity resolver
    *
    * This method allows applications to install their own entity
    * resolver. By installing an entity resolver, the applications
    * can trap and potentially redirect references to external
    * entities.
    *
    * <i>Any previously set entity resolver is merely dropped, since the parser
    * does not own them.  If both setEntityResolver and setXMLEntityResolver
    * are called, then the last one is used.</i>
    *
    * @param resolver  A const pointer to the user supplied entity
    *                  resolver.
    *
    * @see #getXMLEntityResolver
    */
    virtual void setXMLEntityResolver(XMLEntityResolver* const resolver) ;

  /**
    * Allow an application to register an error event handler.
    *
    * If the application does not register an error event handler,
    * all error events reported by the SAX parser will be silently
    * ignored, except for fatalError, which will throw a SAXException
    * (this is the default behaviour implemented by HandlerBase).
    *
    * 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.
    *
    * @param handler The error handler.
    * @see ErrorHandler#ErrorHandler
    * @see SAXException#SAXException
    * @see HandlerBase#HandlerBase
    */
    virtual void setErrorHandler(ErrorHandler* const handler) ;

  /**
    * This method installs the user specified PSVI handler on
    * the parser.
    *
    * @param handler A pointer to the PSVI handler to be called
    *                when the parser comes across 'PSVI' events
    *                as per the schema specification.
    */
    virtual void setPSVIHandler(PSVIHandler* const handler);

  /**
    * Set the state of any feature in a SAX2 XMLReader.
    * Supported features in SAX2 for xerces-c are:
    * <br>(See http://xerces.apache.org/xerces-c/program-sax2.html#SAX2Features for detail description).
    *
    * <br>http://xml.org/sax/features/validation (default: false)
    * <br>http://xml.org/sax/features/namespaces (default: true)
    * <br>http://xml.org/sax/features/namespace-prefixes (default: false)
    * <br>http://apache.org/xml/features/validation/dynamic (default: false)
    * <br>http://apache.org/xml/features/validation/reuse-grammar (default: false)
    * <br>http://apache.org/xml/features/validation/schema (default: true)
    * <br>http://apache.org/xml/features/validation/schema-full-checking (default: false)
    * <br>http://apache.org/xml/features/nonvalidating/load-external-dtd (default: true)
    * <br>http://apache.org/xml/features/continue-after-fatal-error (default: false)
    * <br>http://apache.org/xml/features/validation-error-as-fatal (default: false)
    * <br>http://apache.org/xml/features/validation/reuse-validator (Deprecated) (default: false)
    *
    * @param name The unique identifier (URI) of the feature.
    * @param value The requested state of the feature (true or false).
    * @exception SAXNotRecognizedException If the requested feature is not known.
    * @exception SAXNotSupportedException Feature modification is not supported during parse
    *
    */
	virtual void setFeature(const XMLCh* const name, const bool value) ;

  /**
    * Set the value of any property in a SAX2 XMLReader.
    * Supported properties in SAX2 for xerces-c are:
    * <br>(See http://xerces.apache.org/xerces-c/program-sax2.html#SAX2Properties for detail description).
    *
    * <br>http://apache.org/xml/properties/schema/external-schemaLocation
    * <br>http://apache.org/xml/properties/schema/external-noNamespaceSchemaLocation.
    *
    * It takes a void pointer as the property value.  Application is required to initialize this void
    * pointer to a correct type.  See http://xerces.apache.org/xerces-c/program-sax2.html#SAX2Properties
    * to learn exactly what type of property value each property expects for processing.
    * Passing a void pointer that was initialized with a wrong type will lead to unexpected result.
    * If the same property is set more than once, the last one takes effect.
    *
    * @param name The unique identifier (URI) of the property being set.
    * @param value The requested value for the property.  See
    *            http://xerces.apache.org/xerces-c/program-sax2.html#SAX2Properties to learn
    *            exactly what type of property value each property expects for processing.
    *            Passing a void pointer that was initialized with a wrong type will lead
    *            to unexpected result.
    * @exception SAXNotRecognizedException If the requested property is not known.
    * @exception SAXNotSupportedException Property modification is not supported during parse
    */
	virtual void setProperty(const XMLCh* const name, void* value) ;

  /**
    * Parse an XML document.
    *
    * The application can use this method to instruct the SAX parser
    * to begin parsing an XML document from any valid input
    * source (a character stream, a byte stream, or a URI).
    *
    * Applications may not invoke this method while a parse is in
    * progress (they should create a new Parser instead for each
    * additional XML document).  Once a parse is complete, an
    * application may reuse the same Parser object, possibly with a
    * different input source.
    *
    * @param source The input source for the top-level of the
    *               XML document.
    * @exception SAXException Any SAX exception, possibly
    *            wrapping another exception.
    * @exception XMLException An exception from the parser or client
    *            handler code.
    * @see InputSource#InputSource
    * @see #setEntityResolver
    * @see #setDTDHandler
    * @see #setDocumentHandler
    * @see #setErrorHandler
    */
    virtual void parse
    (
        const   InputSource&    source
    ) ;

  /**
    * Parse an XML document from a system identifier (URI).
    *
    * This method is a shortcut for the common case of reading a
    * document from a system identifier.  It is the exact equivalent
    * of the following:
    *
    * parse(new URLInputSource(systemId));
    *
    * If the system identifier is a URL, it must be fully resolved
    * by the application before it is passed to the parser.
    *
    * @param systemId The system identifier (URI).
    * @exception SAXException Any SAX exception, possibly
    *            wrapping another exception.
    * @exception XMLException An exception from the parser or client
    *            handler code.
    * @see #parse(InputSource)
    */
    virtual void parse
    (
        const   XMLCh* const    systemId
    ) ;

  /**
    * Parse an XML document from a system identifier (URI).
    *
    * This method is a shortcut for the common case of reading a
    * document from a system identifier.  It is the exact equivalent
    * of the following:
    *
    * parse(new URLInputSource(systemId));
    *
    * If the system identifier is a URL, it must be fully resolved
    * by the application before it is passed to the parser.
    *
    * @param systemId The system identifier (URI).
    * @exception SAXException Any SAX exception, possibly
    *            wrapping another exception.
    * @exception XMLException An exception from the parser or client
    *            handler code.
    * @see #parse(InputSource)
    */
    virtual void parse
    (
        const   char* const     systemId
    ) ;
	
    //@}

    // -----------------------------------------------------------------------
    //  SAX 2.0-ext
    // -----------------------------------------------------------------------
    /** @name SAX 2.0-ext */
    //@{
    /**
      * This method returns the installed declaration handler.
      *
      * @return A pointer to the installed declaration handler object.
      */
    virtual DeclHandler* getDeclarationHandler() const ;

	/**
      * This method returns the installed lexical handler.
      *
      * @return A pointer to the installed lexical handler object.
      */
    virtual LexicalHandler* getLexicalHandler() const ;

   /**
    * Allow an application to register a declaration event handler.
    *
    * If the application does not register a declaration handler,
    * all events reported by the SAX parser will be silently
    * ignored. (this is the default behaviour implemented by DefaultHandler).
    *
    * 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.
    *
    * @param handler The DTD declaration handler.
    * @see DeclHandler#DeclHandler
    * @see SAXException#SAXException
    * @see DefaultHandler#DefaultHandler
    */
    virtual void setDeclarationHandler(DeclHandler* const handler) ;

   /**
    * Allow an application to register a lexical event handler.
    *
    * If the application does not register a lexical handler,
    * all events reported by the SAX parser will be silently
    * ignored. (this is the default behaviour implemented by HandlerBase).
    *
    * 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.
    *
    * @param handler The error handler.
    * @see LexicalHandler#LexicalHandler
    * @see SAXException#SAXException
    * @see HandlerBase#HandlerBase
    */
    virtual void setLexicalHandler(LexicalHandler* const handler) ;

    //@}

    // -----------------------------------------------------------------------
    //  Getter Methods
    // -----------------------------------------------------------------------
    /** @name Getter Methods (Xerces-C specific) */
    //@{
    /**
	  * This method is used to get the current validator.
	  *
	  * <b>SAX2XMLReader assumes responsibility for the validator.  It will be
	  * deleted when the XMLReader is destroyed.</b>
	  *
	  * @return A pointer to the validator.  An application should not deleted
	  * the object returned.
	  *
	  */
	virtual XMLValidator* getValidator() const ;
    //@}

    /** Get error count from the last parse operation.
      *
      * This method returns the error count from the last parse
      * operation. Note that this count is actually stored in the
      * scanner, so this method simply returns what the
      * scanner reports.
      *
      * @return number of errors encountered during the latest
      *			parse operation.
      */
    virtual int getErrorCount() const ;

    /**
      * This method returns the state of the parser's
      * exit-on-First-Fatal-Error flag.
      *
      * <p>Or you can query the feature "http://apache.org/xml/features/continue-after-fatal-error"
      * which indicates the opposite state.</p>
      *
      * @return true, if the parser is currently configured to
      *         exit on the first fatal error, false otherwise.
      *
      * @see #setExitOnFirstFatalError
      * @see #getFeature
      */
    virtual bool getExitOnFirstFatalError() const ;

    /**
      * This method returns the state of the parser's
      * validation-constraint-fatal flag.
      *
      * <p>Or you can query the feature "http://apache.org/xml/features/validation-error-as-fatal"
      * which means the same thing.
      *
      * @return true, if the parser is currently configured to
      *         set validation constraint errors as fatal, false
      *         otherwise.
      *
      * @see #setValidationContraintFatal
      * @see #getFeature
      */
    virtual bool getValidationConstraintFatal() const ;

    /**
      * Retrieve the grammar that is associated with the specified namespace key
      *
      * @param  nameSpaceKey Namespace key
      * @return Grammar associated with the Namespace key.
      */
    virtual Grammar* getGrammar(const XMLCh* const nameSpaceKey);

    /**
      * Retrieve the grammar where the root element is declared.
      *
      * @return Grammar where root element declared
      */
    virtual Grammar* getRootGrammar();

    /**
      * Returns the string corresponding to a URI id from the URI string pool.
      *
      * @param uriId id of the string in the URI string pool.
      * @return URI string corresponding to the URI id.
      */
    virtual const XMLCh* getURIText(unsigned int uriId) const;

    /**
      * Returns the current src offset within the input source.
      * To be used only while parsing is in progress.
      *
      * @return offset within the input source
      */
    virtual unsigned int getSrcOffset() const;

    //@}

    // -----------------------------------------------------------------------
    //  Setter Methods
    // -----------------------------------------------------------------------
    /** @name Setter Methods (Xerces-C specific) */
    //@{
    /**
	  * This method is used to set a validator.
	  *
	  * <b>SAX2XMLReader assumes responsibility for the validator.  It will be
	  * deleted when the XMLReader is destroyed.</b>
	  *
	  * @param valueToAdopt A pointer to the validator that the reader should use.
	  *
	  */
	virtual void setValidator(XMLValidator* valueToAdopt) ;

    /**
      * This method allows users to set the parser's behaviour when it
      * encounters the first fatal error. If set to true, the parser
      * will exit at the first fatal error. If false, then it will
      * report the error and continue processing.
      *
      * <p>The default value is 'true' and the parser exits on the
      * first fatal error.</p>
      *
      * <p>Or you can set the feature "http://apache.org/xml/features/continue-after-fatal-error"
      * which has the opposite behaviour.</p>
      *
      * <p>If both the feature above and this function are used, the latter takes effect.</p>
      *
      * @param newState The value specifying whether the parser should
      *                 continue or exit when it encounters the first
      *                 fatal error.
      *
      * @see #getExitOnFirstFatalError
      * @see #setFeature
      */
    virtual void setExitOnFirstFatalError(const bool newState) ;

    /**
      * This method allows users to set the parser's behaviour when it
      * encounters a validtion constraint error. If set to true, and the
      * the parser will treat validation error as fatal and will exit depends on the
      * state of "getExitOnFirstFatalError". If false, then it will
      * report the error and continue processing.
      *
      * Note: setting this true does not mean the validation error will be printed with
      * the word "Fatal Error".   It is still printed as "Error", but the parser
      * will exit if "setExitOnFirstFatalError" is set to true.
      *
      * <p>The default value is 'false'.</p>
      *
      * <p>Or you can set the feature "http://apache.org/xml/features/validation-error-as-fatal"
      * which means the same thing.</p>
      *
      * <p>If both the feature above and this function are used, the latter takes effect.</p>
      *
      * @param newState If true, the parser will exit if "setExitOnFirstFatalError"
      *                 is set to true.
      *
      * @see #getValidationConstraintFatal
      * @see #setExitOnFirstFatalError
      * @see #setFeature
      */
    virtual void setValidationConstraintFatal(const bool newState) ;
    //@}


    // -----------------------------------------------------------------------
    //  Progressive scan methods
    // -----------------------------------------------------------------------

    /** @name Progressive scan methods */
    //@{

    /** Begin a progressive parse operation
      *
      * This method is used to start a progressive parse on a XML file.
      * To continue parsing, subsequent calls must be to the parseNext
      * method.
      *
      * It scans through the prolog and returns a token to be used on
      * subsequent scanNext() calls. If the return value is true, then the
      * token is legal and ready for further use. If it returns false, then
      * the scan of the prolog failed and the token is not going to work on
      * subsequent scanNext() calls.
      *
      * @param systemId A pointer to a Unicode string represting the path
      *                 to the XML file to be parsed.
      * @param toFill   A token maintaing state information to maintain
      *                 internal consistency between invocation of 'parseNext'
      *                 calls.
      *
      * @return 'true', if successful in parsing the prolog. It indicates the
      *         user can go ahead with parsing the rest of the file. It
      *         returns 'false' to indicate that the parser could parse the
      *         prolog (which means the token will not be valid.)
      *
      * @see #parseNext
      * @see #parseFirst(char*,...)
      * @see #parseFirst(InputSource&,...)
      */
    virtual bool parseFirst
    (
        const   XMLCh* const    systemId
        ,       XMLPScanToken&  toFill
    ) ;

    /** Begin a progressive parse operation
      *
      * This method is used to start a progressive parse on a XML file.
      * To continue parsing, subsequent calls must be to the parseNext
      * method.
      *
      * It scans through the prolog and returns a token to be used on
      * subsequent scanNext() calls. If the return value is true, then the
      * token is legal and ready for further use. If it returns false, then
      * the scan of the prolog failed and the token is not going to work on
      * subsequent scanNext() calls.
      *
      * @param systemId A pointer to a regular native string represting
      *                 the path to the XML file to be parsed.
      * @param toFill   A token maintaing state information to maintain
      *                 internal consIstency between invocation of 'parseNext'
      *                 calls.
      *
      * @return 'true', if successful in parsing the prolog. It indicates the
      *         user can go ahead with parsing the rest of the file. It
      *         returns 'false' to indicate that the parser could not parse
      *         the prolog.
      *
      * @see #parseNext
      * @see #parseFirst(XMLCh*,...)
      * @see #parseFirst(InputSource&,...)
      */
    virtual bool parseFirst
    (
        const   char* const     systemId
        ,       XMLPScanToken&  toFill
    ) ;

    /** Begin a progressive parse operation
      *
      * This method is used to start a progressive parse on a XML file.
      * To continue parsing, subsequent calls must be to the parseNext
      * method.
      *
      * It scans through the prolog and returns a token to be used on
      * subsequent scanNext() calls. If the return value is true, then the
      * token is legal and ready for further use. If it returns false, then
      * the scan of the prolog failed and the token is not going to work on
      * subsequent scanNext() calls.
      *
      * @param source   A const reference to the InputSource object which
      *                 points to the XML file to be parsed.
      * @param toFill   A token maintaing state information to maintain
      *                 internal consistency between invocation of 'parseNext'
      *                 calls.
      *
      * @return 'true', if successful in parsing the prolog. It indicates the
      *         user can go ahead with parsing the rest of the file. It
      *         returns 'false' to indicate that the parser could not parse
      *         the prolog.
      *
      * @see #parseNext
      * @see #parseFirst(XMLCh*,...)
      * @see #parseFirst(char*,...)
      */
    virtual bool parseFirst
    (
        const   InputSource&    source
        ,       XMLPScanToken&  toFill
    ) ;

    /** Continue a progressive parse operation
      *
      * This method is used to continue with progressive parsing of
      * XML files started by a call to 'parseFirst' method.
      *
      * It parses the XML file and stops as soon as it comes across
      * a XML token (as defined in the XML specification). Relevant
      * callback handlers are invoked as required by the SAX
      * specification.
      *
      * @param token A token maintaing state information to maintain
      *              internal consistency between invocation of 'parseNext'
      *              calls.
      *
      * @return 'true', if successful in parsing the next XML token.
      *         It indicates the user can go ahead with parsing the rest
      *         of the file. It returns 'false' to indicate that the parser
      *         could not find next token as per the XML specification
      *         production rule.
      *
      * @see #parseFirst(XMLCh*,...)
      * @see #parseFirst(char*,...)
      * @see #parseFirst(InputSource&,...)
      */
    virtual bool parseNext(XMLPScanToken& token) ;

    /** Reset the parser after a progressive parse
      *
      * If a progressive parse loop exits before the end of the document
      * is reached, the parser has no way of knowing this. So it will leave
      * open any files or sockets or memory buffers that were in use at
      * the time that the parse loop exited.
      *
      * The next parse operation will cause these open files and such to
      * be closed, but the next parse operation might occur at some unknown
      * future point. To avoid this problem, you should reset the parser if
      * you exit the loop early.
      *
      * If you exited because of an error, then this cleanup will be done
      * for you. Its only when you exit the file prematurely of your own
      * accord, because you've found what you wanted in the file most
      * likely.
      *
      * @param token A token maintaing state information to maintain
      *              internal consistency between invocation of 'parseNext'
      *              calls.
      */
    virtual void parseReset(XMLPScanToken& token) ;

    //@}

    // -----------------------------------------------------------------------
    //  Implementation of the grammar preparsing interface
    // -----------------------------------------------------------------------

    /** @name Implementation of Grammar preparsing interface's. */
    //@{
    /**
      * Preparse schema grammar (XML Schema, DTD, etc.) via an input source
      * object.
      *
      * This method invokes the preparsing process on a schema grammar XML
      * file specified by the SAX InputSource parameter.
      *
      * <p><b>"Experimental - subject to change"</b></p>
      *
      * @param source A const reference to the SAX InputSource object which
      *               points to the schema grammar file to be preparsed.
      * @param grammarType The grammar type (Schema or DTD).
      * @param toCache If <code>true</code>, we cache the preparsed grammar,
      *                otherwise, no chaching. Default is <code>false</code>.
      * @return The preparsed schema grammar object (SchemaGrammar or
      *         DTDGrammar). That grammar object is owned by the parser.
      *
      * @exception SAXException Any SAX exception, possibly
      *            wrapping another exception.
      * @exception XMLException An exception from the parser or client
      *            handler code.
      * @exception DOMException A DOM exception as per DOM spec.
      *
      * @see InputSource#InputSource
      */
    virtual Grammar* loadGrammar(const InputSource& source,
                                 const short grammarType,
                                 const bool toCache = false);

    /**
      * Preparse schema grammar (XML Schema, DTD, etc.) via a file path or URL
      *
      * This method invokes the preparsing process on a schema grammar XML
      * file specified by the file path parameter.
      *
      * <p><b>"Experimental - subject to change"</b></p>
      *
      * @param systemId A const XMLCh pointer to the Unicode string which
      *                 contains the path to the XML grammar file to be
      *                 preparsed.
      * @param grammarType The grammar type (Schema or DTD).
      * @param toCache If <code>true</code>, we cache the preparsed grammar,
      *                otherwise, no chaching. Default is <code>false</code>.
      * @return The preparsed schema grammar object (SchemaGrammar or
      *         DTDGrammar). That grammar object is owned by the parser.
      *
      * @exception SAXException Any SAX exception, possibly
      *            wrapping another exception.
      * @exception XMLException An exception from the parser or client
      *            handler code.
      * @exception DOMException A DOM exception as per DOM spec.
      */
    virtual Grammar* loadGrammar(const XMLCh* const systemId,
                                 const short grammarType,
                                 const bool toCache = false);

    /**
      * Preparse schema grammar (XML Schema, DTD, etc.) via a file path or URL
      *
      * This method invokes the preparsing process on a schema grammar XML
      * file specified by the file path parameter.
      *
      * <p><b>"Experimental - subject to change"</b></p>
      *
      * @param systemId A const char pointer to a native string which contains
      *                 the path to the XML grammar file to be preparsed.
      * @param grammarType The grammar type (Schema or DTD).
      * @param toCache If <code>true</code>, we cache the preparsed grammar,
      *                otherwise, no chaching. Default is <code>false</code>.
      * @return The preparsed schema grammar object (SchemaGrammar or
      *         DTDGrammar). That grammar object is owned by the parser.
      *
      * @exception SAXException Any SAX exception, possibly
      *            wrapping another exception.
      * @exception XMLException An exception from the parser or client
      *            handler code.
      * @exception DOMException A DOM exception as per DOM spec.
      */
    virtual Grammar* loadGrammar(const char* const systemId,
                                 const short grammarType,
                                 const bool toCache = false);

    /**
      * Clear the cached grammar pool
      */
    virtual void resetCachedGrammarPool();

    /** Set maximum input buffer size
      *
      * This method allows users to limit the size of buffers used in parsing
      * XML character data. The effect of setting this size is to limit the
      * size of a ContentHandler::characters() call.
      *
      * The parser's default input buffer size is 1 megabyte.
      *
      * @param bufferSize The maximum input buffer size
      */
    virtual void setInputBufferSize(const size_t bufferSize);

    //@}


    // -----------------------------------------------------------------------
    //  Advanced document handler list maintenance methods
    // -----------------------------------------------------------------------

    /** @name Advanced document handler list maintenance methods */
    //@{
    /**
      * This method installs the specified 'advanced' document callback
      * handler, thereby allowing the user to customize the processing,
      * if they choose to do so. Any number of advanced callback handlers
      * maybe installed.
      *
      * <p>The methods in the advanced callback interface represent
      * Xerces-C extensions. There is no specification for this interface.</p>
      *
      * @param toInstall A pointer to the users advanced callback handler.
      *
      * @see #removeAdvDocHandler
      */
    virtual void installAdvDocHandler(XMLDocumentHandler* const toInstall) ;

    /**
      * This method removes the 'advanced' document handler callback from
      * the underlying parser scanner. If no handler is installed, advanced
      * callbacks are not invoked by the scanner.
      * @param toRemove A pointer to the advanced callback handler which
      *                 should be removed.
      *
      * @see #installAdvDocHandler
      */
    virtual bool removeAdvDocHandler(XMLDocumentHandler* const toRemove) ;
    //@}

	// -----------------------------------------------------------------------
    //  Implementation of the XMLDocumentHandler interface
    // -----------------------------------------------------------------------
    /** @name Implementation of the XMLDocumentHandler Interface. */
    //@{
    /**
      * This method is used to report all the characters scanned
      * by the parser. The driver will invoke the 'characters'
      * method of the user installed SAX Document Handler.
      *
      * <p>If any advanced callback handlers are installed, the
      * corresponding 'docCharacters' method will also be invoked.</p>
      *
      * @param chars   A const pointer to a Unicode string representing the
      *                character data.
      * @param length  The length of the Unicode string returned in 'chars'.
      * @param cdataSection  A flag indicating if the characters represent
      *                      content from the CDATA section.
      * @see DocumentHandler#characters
      */
    virtual void docCharacters
    (
        const   XMLCh* const    chars
        , const unsigned int    length
        , const bool            cdataSection
    );

    /**
      * This method is used to report any comments scanned by the parser.
      * This method is a no-op unless, unless an advanced callback handler
      * is installed, in which case the corresponding 'docComment' method
      * is invoked.
      *
      * @param comment A const pointer to a null terminated Unicode
      *                string representing the comment text.
      */
    virtual void docComment
    (
        const   XMLCh* const    comment
    );

    /**
      * This method is used to report any PI scanned by the parser.
      *
      * <p>Any PI's occurring before any 'content' are not reported
      * to any SAX handler as per the specification. However, all
      * PI's within content are reported via the SAX Document Handler's
      * 'processingInstruction' method.
      *
      * <p>If any advanced callback handlers are installed, the
      * corresponding 'docPI' method will be invoked.</p>
      *
      * @param target A const pointer to a Unicode string representing the
      *               target of the PI declaration.
      * @param data   A const pointer to a Unicode string representing the
      *               data of the PI declaration. See the PI production rule
      *               in the XML specification for details.
      *
      * @see DocumentHandler#processingInstruction
      */
    virtual void docPI
    (
        const   XMLCh* const    target
        , const XMLCh* const    data
    );

    /**
      * This method is used to indicate the end of root element
      * was just scanned by the parser. Corresponding 'endDocument'
      * method of the user installed SAX Document Handler will also
      * be invoked.
      *
      * <p>In addition, if any advanced callback handlers are installed,
      * the corresponding 'endDocument' method is invoked.</p>
      *
      * @see DocumentHandler#endDocument
      */
    virtual void endDocument();

    /**
      * This method is used to indicate the end tag of an element.
      * The driver will invoke the corresponding 'endElement' method of
      * the SAX Document Handler interface.
      *
      * <p>If any advanced callback handlers are installed, the
      * corresponding 'endElement' method is also invoked.</p>
      *
      * @param elemDecl A const reference to the object containing element
      *                 declaration information.
      * @param urlId    An id referring to the namespace prefix, if
      *                 namespaces setting is switched on.
      * @param isRoot   A flag indicating whether this element was the
      *                 root element.
      * @param elemPrefix A const pointer to a Unicode string containing
      *                   the namespace prefix for this element. Applicable
      *                   only when namespace processing is enabled.
      * @see DocumentHandler#endElement
      */
    virtual void endElement
    (
        const   XMLElementDecl& elemDecl
        , const unsigned int    urlId
        , const bool            isRoot
        , const XMLCh* const    elemPrefix=0
    );

    /**
      * This method is used to indicate that an end of an entity reference
      * was just scanned.
      *
      * <p>If any advanced callback handlers are installed, the
      * corresponding 'endEnityReference' method is invoked.</p>
      *
      * @param entDecl A const reference to the object containing the
      *                entity declaration information.
      */
    virtual void endEntityReference
    (
        const   XMLEntityDecl&  entDecl
    );

    /**
      * This method is used to report all the whitespace characters,
      * which are determined to be 'ignorable'. This distinction
      * between characters is only made, if validation is enabled.
      * Corresponding 'ignorableWhitespace' method of the user installed
      * SAX Document Handler interface is called.
      *
      * <p>Any whitespace before content is not reported to the SAX
      * Document Handler method, as per the SAX specification.
      * However, if any advanced callback handlers are installed, the
      * corresponding 'ignorableWhitespace' method is invoked.</p>
      *
      * @param chars   A const pointer to a Unicode string representing the
      *                ignorable whitespace character data.
      * @param length  The length of the Unicode string 'chars'.
      * @param cdataSection  A flag indicating if the characters represent
      *                      content from the CDATA section.
      * @see DocumentHandler#ignorableWhitespace
      */
    virtual void ignorableWhitespace
    (
        const   XMLCh* const    chars
        , const unsigned int    length
        , const bool            cdataSection
    );

    /**
      * This method allows the user installed Document Handler and
      * any advanced callback handlers to 'reset' themselves.
      */
    virtual void resetDocument();

    /**
      * This method is used to report the start of the parsing process.
      * The corresponding user installed SAX Document Handler's method
      * 'startDocument' is invoked.
      *
      * <p>If any advanced callback handlers are installed, then the
      * corresponding 'startDocument' method is also called.</p>
      *
      * @see DocumentHandler#startDocument
      */
    virtual void startDocument();

    /**
      * This method is used to report the start of an element. It is
      * called at the end of the element, by which time all attributes
      * specified are also parsed. The corresponding user installed
      * SAX Document Handler's method 'startElement' is invoked.
      *
      * <p>If any advanced callback handlers are installed, then the
      * corresponding 'startElement' method is also called.</p>
      *
      * @param elemDecl A const reference to the object containing element
      *                 declaration information.
      * @param urlId    An id referring to the namespace prefix, if
      *                 namespaces setting is switched on.
      * @param elemPrefix A const pointer to a Unicode string containing
      *                   the namespace prefix for this element. Applicable
      *                   only when namespace processing is enabled.
      * @param attrList  A const reference to the object containing the
      *                  list of attributes just scanned for this element.
      * @param attrCount A count of number of attributes in the list
      *                  specified by the parameter 'attrList'.
      * @param isEmpty  A flag indicating whether this is an empty element
      *                 or not.
      * @param isRoot   A flag indicating whether this element was the
      *                 root element.
      * @see DocumentHandler#startElement
      */
    virtual void startElement
    (
        const   XMLElementDecl&         elemDecl
        , const unsigned int            urlId
        , const XMLCh* const            elemPrefix
        , const RefVectorOf<XMLAttr>&   attrList
        , const unsigned int            attrCount
        , const bool                    isEmpty
        , const bool                    isRoot
    );

    /**
      * This method is used to indicate the start of an entity reference.
      *
      * <p>If any advanced callback handlers are installed, the
      * corresponding 'endEnityReference' method is invoked.</p>
      *
      * @param entDecl A const reference to the object containing the
      *                entity declaration information.
      */
    virtual void startEntityReference
    (
        const   XMLEntityDecl&  entDecl
    );

    /**
      * This method is used to report the XML decl scanned by the parser.
      * Refer to the XML specification to see the meaning of parameters.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param versionStr A const pointer to a Unicode string representing
      *                   version string value.
      * @param encodingStr A const pointer to a Unicode string representing
      *                    the encoding string value.
      * @param standaloneStr A const pointer to a Unicode string
      *                      representing the standalone string value.
      * @param actualEncodingStr A const pointer to a Unicode string
      *                          representing the actual encoding string
      *                          value.
      */
    virtual void XMLDecl
    (
        const   XMLCh* const    versionStr
        , const XMLCh* const    encodingStr
        , const XMLCh* const    standaloneStr
        , const XMLCh* const    actualEncodingStr
    );
    //@}


    // -----------------------------------------------------------------------
    //  Implementation of the XMLErrorReporter interface
    // -----------------------------------------------------------------------

    /** @name Implementation of the XMLErrorReporter Interface. */
    //@{
    /**
      * This method is used to report back errors found while parsing the
      * XML file. The driver will call the corresponding user installed
      * SAX Error Handler methods: 'fatal', 'error', 'warning' depending
      * on the severity of the error. This classification is defined by
      * the XML specification.
      *
      * @param errCode An integer code for the error.
      * @param msgDomain A const pointer to an Unicode string representing
      *                  the message domain to use.
      * @param errType An enumeration classifying the severity of the error.
      * @param errorText A const pointer to an Unicode string representing
      *                  the text of the error message.
      * @param systemId  A const pointer to an Unicode string representing
      *                  the system id of the XML file where this error
      *                  was discovered.
      * @param publicId  A const pointer to an Unicode string representing
      *                  the public id of the XML file where this error
      *                  was discovered.
      * @param lineNum   The line number where the error occurred.
      * @param colNum    The column number where the error occurred.
      * @see ErrorHandler
      */
    virtual void error
    (
        const   unsigned int                errCode
        , const XMLCh* const                msgDomain
        , const XMLErrorReporter::ErrTypes  errType
        , const XMLCh* const                errorText
        , const XMLCh* const                systemId
        , const XMLCh* const                publicId
        , const XMLSSize_t                   lineNum
        , const XMLSSize_t                   colNum
    );

    /**
      * This method allows the user installed Error Handler
      * callback to 'reset' itself.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      */
    virtual void resetErrors();
    //@}


    // -----------------------------------------------------------------------
    //  Implementation of the XMLEntityHandler interface
    // -----------------------------------------------------------------------

    /** @name Implementation of the XMLEntityHandler Interface. */
    //@{
    /**
      * This method is used to indicate the end of parsing of an external
      * entity file.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param inputSource A const reference to the InputSource object
      *                    which points to the XML file being parsed.
      * @see InputSource
      */
    virtual void endInputSource(const InputSource& inputSource);

    /**
      * This method allows an installed XMLEntityHandler to further
      * process any system id's of enternal entities encountered in
      * the XML file being parsed, such as redirection etc.
      *
      * <b><font color="#FF0000">This method always returns 'false'
      * for this SAX driver implementation.</font></b>
      *
      * @param systemId  A const pointer to an Unicode string representing
      *                  the system id scanned by the parser.
      * @param toFill    A pointer to a buffer in which the application
      *                  processed system id is stored.
      * @return 'true', if any processing is done, 'false' otherwise.
      */
    virtual bool expandSystemId
    (
        const   XMLCh* const    systemId
        ,       XMLBuffer&      toFill
    );

    /**
      * This method allows the installed XMLEntityHandler to reset
      * itself.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      */
    virtual void resetEntities();

    /**
      * This method allows a user installed entity handler to further
      * process any pointers to external entities. The applications
      * can implement 'redirection' via this callback. The driver
      * should call the SAX EntityHandler 'resolveEntity' method.
      *
      * @deprecated This method is no longer called (the other resolveEntity one is).
      *
      * @param publicId A const pointer to a Unicode string representing the
      *                 public id of the entity just parsed.
      * @param systemId A const pointer to a Unicode string representing the
      *                 system id of the entity just parsed.
      * @param baseURI  A const pointer to a Unicode string representing the
      *                 base URI of the entity just parsed,
      *                 or <code>null</code> if there is no base URI.
      * @return The value returned by the SAX resolveEntity method or
      *         NULL otherwise to indicate no processing was done.
      *         The returned InputSource is owned by the parser which is
      *         responsible to clean up the memory.
      * @see EntityResolver
      * @see XMLEntityHandler
      */
    virtual InputSource* resolveEntity
    (
        const   XMLCh* const    publicId
        , const XMLCh* const    systemId
        , const XMLCh* const    baseURI = 0
    );

    /** Resolve a public/system id
      *
      * This method allows a user installed entity handler to further
      * process any pointers to external entities. The applications can
      * implement 'redirection' via this callback.  
      *
      * @param resourceIdentifier An object containing the type of
      *        resource to be resolved and the associated data members
      *        corresponding to this type.
      * @return The value returned by the user installed resolveEntity
      *         method or NULL otherwise to indicate no processing was done.
      *         The returned InputSource is owned by the parser which is
      *         responsible to clean up the memory.
      * @see XMLEntityHandler
      * @see XMLEntityResolver
      */
    virtual InputSource* resolveEntity
    (
        XMLResourceIdentifier* resourceIdentifier
    );

    /**
      * This method is used to indicate the start of parsing an
      * external entity file.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param inputSource A const reference to the InputSource object
      *                    which points to the external entity
      *                    being parsed.
      */
    virtual void startInputSource(const InputSource& inputSource);
    //@}

    // -----------------------------------------------------------------------
    //  Implementation of the Deprecated DocTypeHandler Interface
    // -----------------------------------------------------------------------

    /** @name Implementation of the deprecated DocTypeHandler Interface */
    //@{
    /**
      * This method is used to report an attribute definition.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX
      * driver implementation.</font></b>
      *
      * @param elemDecl A const reference to the object containing information
      *                 about the element whose attribute definition was just
      *                 parsed.
      * @param attDef   A const reference to the object containing information
      *                 attribute definition.
      * @param ignore   The flag indicating whether this attribute definition
      *                 was ignored by the parser or not.
      */
    virtual void attDef
    (
        const   DTDElementDecl& elemDecl
        , const DTDAttDef&      attDef
        , const bool            ignoring
    );

    /**
      * This method is used to report a comment occurring within the DTD.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param comment  A const pointer to a Unicode string representing the
      *                 text of the comment just parsed.
      */
    virtual void doctypeComment
    (
        const   XMLCh* const    comment
    );

    /**
      * This method is used to report the DOCTYPE declaration.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param elemDecl A const reference to the object containing information
      *                 about the root element definition declaration of the
      *                 XML document being parsed.
      * @param publicId A const pointer to a Unicode string representing the
      *                 public id of the DTD file.
      * @param systemId A const pointer to a Unicode string representing the
      *                 system id of the DTD file.
      * @param hasIntSubset A flag indicating if this XML file contains any
      *                     internal subset.
      * @param hasExtSubset A flag indicating if this XML file contains any
      *                     external subset. Default is false.
      */
    virtual void doctypeDecl
    (
        const   DTDElementDecl& elemDecl
        , const XMLCh* const    publicId
        , const XMLCh* const    systemId
        , const bool            hasIntSubset
        , const bool            hasExtSubset = false
    );

    /**
      * This method is used to report any PI declarations
      * occurring inside the DTD definition block.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param target A const pointer to a Unicode string representing the
      *               target of the PI declaration.
      * @param data   A const pointer to a Unicode string representing the
      *               data of the PI declaration. See the PI production rule
      *               in the XML specification for details.
      */
    virtual void doctypePI
    (
        const   XMLCh* const    target
        , const XMLCh* const    data
    );

    /**
      * This method is used to report any whitespaces
      * occurring inside the DTD definition block.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param chars  A const pointer to a Unicode string representing the
      *               whitespace characters.
      * @param length The length of the whitespace Unicode string.
      */
    virtual void doctypeWhitespace
    (
        const   XMLCh* const    chars
        , const unsigned int    length
    );

    /**
      * This method is used to report an element declarations
      * successfully scanned by the parser.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param decl   A const reference to the object containing element
      *               declaration information.
      * @param isIgnored The flag indicating whether this definition was
      *                  ignored by the parser or not.
      */
    virtual void elementDecl
    (
        const   DTDElementDecl& decl
        , const bool            isIgnored
    );

    /**
      * This method is used to report the end of an attribute
      * list declaration for an element.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param elemDecl A const reference to the object containing element
      *                 declaration information.
      */
    virtual void endAttList
    (
        const   DTDElementDecl& elemDecl
    );

    /**
      * This method is used to report the end of the internal subset.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      */
    virtual void endIntSubset();

    /**
      * This method is used to report the end of the external subset.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      */
    virtual void endExtSubset();

    /**
      * This method is used to report any entity declarations.
      * For unparsed entities, this driver will invoke the
      * SAX DTDHandler::unparsedEntityDecl callback.
      *
      * @param entityDecl A const reference to the object containing
      *                   the entity declaration information.
      * @param isPEDecl  The flag indicating whether this was a
      *                  parameter entity declaration or not.
      * @param isIgnored The flag indicating whether this definition
      *                  was ignored by the parser or not.
      *
      * @see DTDHandler#unparsedEntityDecl
      */
    virtual void entityDecl
    (
        const   DTDEntityDecl&  entityDecl
        , const bool            isPEDecl
        , const bool            isIgnored
    );

    /**
      * This method allows the user installed DTD handler to
      * reset itself.
      */
    virtual void resetDocType();

    /**
      * This method is used to report any notation declarations.
      * If there is a user installed DTDHandler, then the driver will
      * invoke the SAX DTDHandler::notationDecl callback.
      *
      * @param notDecl A const reference to the object containing the notation
      *                declaration information.
      * @param isIgnored The flag indicating whether this definition was ignored
      *                  by the parser or not.
      *
      * @see DTDHandler#notationDecl
      */
    virtual void notationDecl
    (
        const   XMLNotationDecl&    notDecl
        , const bool                isIgnored
    );

    /**
      * This method is used to indicate the start of an element's attribute
      * list declaration.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param elemDecl A const reference to the object containing element
      *                 declaration information.
      */
    virtual void startAttList
    (
        const   DTDElementDecl& elemDecl
    );

    /**
      * This method is used indicate the start of the internal subset.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      */
    virtual void startIntSubset();

    /**
      * This method is used indicate the start of the external subset.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      */
    virtual void startExtSubset();

    /**
      * This method is used to report the TextDecl. Refer to the XML
      * specification for the syntax of a TextDecl.
      *
      * <b><font color="#FF0000">This method is a no-op for this SAX driver
      * implementation.</font></b>
      *
      * @param versionStr A const pointer to a Unicode string representing
      *                   the version number of the 'version' clause.
      * @param encodingStr A const pointer to a Unicode string representing
      *                    the encoding name of the 'encoding' clause.
      */
    virtual void TextDecl
    (
        const   XMLCh* const    versionStr
        , const XMLCh* const    encodingStr
    );
    //@}


private :
    // -----------------------------------------------------------------------
    //  Unimplemented constructors and operators
    // -----------------------------------------------------------------------
    SAX2XMLReaderImpl(const SAX2XMLReaderImpl&);
    SAX2XMLReaderImpl& operator=(const SAX2XMLReaderImpl&);

    // -----------------------------------------------------------------------
    //  Initialize/Cleanup methods
    // -----------------------------------------------------------------------
    void initialize();
    void cleanUp();
    void resetInProgress();

    // -----------------------------------------------------------------------
    //  Private data members
    //
    //  fAttrList
    //      A temporary implementation of the basic SAX2 Attributes
    //      interface. We use this one over and over on each startElement
    //      event to allow SAX-like access to the element attributes.
    //
    //  fDocHandler
    //      The installed SAX content handler, if any. Null if none.
    //
    //  fnamespacePrefix
    //      Indicates whether the namespace-prefix feature is on or off.
    //
    //  fautoValidation
    //      Indicates whether automatic validation is on or off
    //
    //  fValidation
    //      Indicates whether the 'validation' core features is on or off
    //
    //  fReuseGrammar
    //      Tells the parser whether it should reuse the grammar or not.
    //      If true, there cannot be any internal subset.
    //
    //	fPrefixesStorage
    //		the namespace prefixes will be allocated from this pool
    //
    //	fPrefixes
    //		A Stack of the current namespace prefixes that need calls to
    //		endPrefixMapping
    //
    //	fPrefixCounts
    //		A Stack of the number of prefixes that need endPrefixMapping
    //		calls for that element
    //
    //  fDTDHandler
    //      The installed SAX DTD handler, if any. Null if none.
    //
    //  fElemDepth
    //      This is used to track the element nesting depth, so that we can
    //      know when we are inside content. This is so we can ignore char
    //      data outside of content.
    //
    //  fEntityResolver
    //      The installed SAX entity handler, if any. Null if none.
    //
    //  fErrorHandler
    //      The installed SAX error handler, if any. Null if none.
    //
    //  fLexicalHandler
    //      The installed SAX lexical handler, if any.  Null if none.
    //
    //  fDecllHandler
    //      The installed SAX declaration handler, if any.  Null if none.
    //
    //  fAdvDHCount
    //  fAdvDHList
    //  fAdvDHListSize
    //      This is an array of pointers to XMLDocumentHandlers, which is
    //      how we see installed advanced document handlers. There will
    //      usually not be very many at all, so a simple array is used
    //      instead of a collection, for performance. It will grow if needed,
    //      but that is unlikely.
    //
    //      The count is how many handlers are currently installed. The size
    //      is how big the array itself is (for expansion purposes.) When
    //      count == size, is time to expand.
    //
    //  fParseInProgress
    //      This flag is set once a parse starts. It is used to prevent
    //      multiple entrance or reentrance of the parser.
    //
    //  fScanner
    //      The scanner being used by this parser. It is created internally
    //      during construction.
    //
    //  fHasExternalSubset
    //      Indicate if the document has external DTD subset.
    //
    //   fGrammarPool
    //      The grammar pool passed from external application (through derivatives).
    //      which could be 0, not owned.
    //
    // -----------------------------------------------------------------------
    bool                        fNamespacePrefix;
    bool                        fAutoValidation;
    bool                        fValidation;
    bool                        fParseInProgress;
    bool                        fHasExternalSubset;
    unsigned int                fElemDepth;
    unsigned int                fAdvDHCount;
    unsigned int                fAdvDHListSize;
    VecAttributesImpl		    fAttrList ;
    ContentHandler*		        fDocHandler ;
    RefVectorOf<XMLAttr>*       fTempAttrVec ;
    XMLStringPool*              fPrefixesStorage ;
    ValueStackOf<unsigned int>* fPrefixes ;
    ValueStackOf<unsigned int>* fPrefixCounts ;
    DTDHandler*                 fDTDHandler;
    EntityResolver*             fEntityResolver;
    XMLEntityResolver*          fXMLEntityResolver;
    ErrorHandler*               fErrorHandler;
    PSVIHandler*                fPSVIHandler;
    LexicalHandler*             fLexicalHandler;
    DeclHandler*                fDeclHandler;
    XMLDocumentHandler**        fAdvDHList;
    XMLScanner*                 fScanner;
    GrammarResolver*            fGrammarResolver;
    XMLStringPool*              fURIStringPool;
    XMLValidator*               fValidator;
    MemoryManager*              fMemoryManager;
    XMLGrammarPool*             fGrammarPool;
	
    // -----------------------------------------------------------------------
    // internal function used to set the state of the parser
    // -----------------------------------------------------------------------
    void setValidationScheme(const ValSchemes newScheme);
    void setDoNamespaces(const bool newState);
    bool getDoNamespaces() const;
    void setDoSchema(const bool newState);
    bool getDoSchema() const;
};


// ---------------------------------------------------------------------------
//  SAX2XMLReader: Getter methods
// ---------------------------------------------------------------------------
inline ContentHandler* SAX2XMLReaderImpl::getContentHandler() const
{
    return fDocHandler;
}

inline DTDHandler* SAX2XMLReaderImpl::getDTDHandler() const
{
	return fDTDHandler ;
}

inline EntityResolver* SAX2XMLReaderImpl::getEntityResolver() const
{
	return fEntityResolver;
}

inline XMLEntityResolver* SAX2XMLReaderImpl::getXMLEntityResolver() const
{
	return fXMLEntityResolver;
}

inline ErrorHandler* SAX2XMLReaderImpl::getErrorHandler() const
{
	return fErrorHandler;
}

inline PSVIHandler* SAX2XMLReaderImpl::getPSVIHandler() const
{
	return fPSVIHandler;
}

inline LexicalHandler* SAX2XMLReaderImpl::getLexicalHandler() const
{
   return fLexicalHandler;
}

inline DeclHandler* SAX2XMLReaderImpl::getDeclarationHandler() const
{
   return fDeclHandler;
}

inline bool SAX2XMLReaderImpl::getExitOnFirstFatalError() const
{
    return fScanner->getExitOnFirstFatal();
}

inline bool SAX2XMLReaderImpl::getValidationConstraintFatal() const
{
    return fScanner->getValidationConstraintFatal();
}

inline Grammar* SAX2XMLReaderImpl::getRootGrammar()
{
    return fScanner->getRootGrammar();
}

inline const XMLCh* SAX2XMLReaderImpl::getURIText(unsigned int uriId) const
{
    return fScanner->getURIText(uriId);
}

inline unsigned int SAX2XMLReaderImpl::getSrcOffset() const
{
    return fScanner->getSrcOffset();
}

XERCES_CPP_NAMESPACE_END

#endif
