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

package org.apache.xerces.dom;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Vector;

import org.apache.xerces.impl.Constants;
import org.apache.xerces.impl.RevalidationHandler;
import org.apache.xerces.impl.dtd.XMLDTDLoader;
import org.apache.xerces.impl.dtd.XMLDTDValidator;
import org.apache.xerces.impl.dv.XSSimpleType;
import org.apache.xerces.impl.xs.util.SimpleLocator;
import org.apache.xerces.util.AugmentationsImpl;
import org.apache.xerces.util.NamespaceSupport;
import org.apache.xerces.util.SymbolTable;
import org.apache.xerces.util.XML11Char;
import org.apache.xerces.util.XMLChar;
import org.apache.xerces.util.XMLSymbols;
import org.apache.xerces.xni.Augmentations;
import org.apache.xerces.xni.NamespaceContext;
import org.apache.xerces.xni.QName;
import org.apache.xerces.xni.XMLAttributes;
import org.apache.xerces.xni.XMLDocumentHandler;
import org.apache.xerces.xni.XMLLocator;
import org.apache.xerces.xni.XMLResourceIdentifier;
import org.apache.xerces.xni.XMLString;
import org.apache.xerces.xni.XNIException;
import org.apache.xerces.xni.grammars.XMLGrammarDescription;
import org.apache.xerces.xni.parser.XMLComponent;
import org.apache.xerces.xni.parser.XMLDocumentSource;
import org.apache.xerces.xs.AttributePSVI;
import org.apache.xerces.xs.ElementPSVI;
import org.apache.xerces.xs.XSTypeDefinition;
import org.w3c.dom.Attr;
import org.w3c.dom.Comment;
import org.w3c.dom.DOMError;
import org.w3c.dom.DOMErrorHandler;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentType;
import org.w3c.dom.Element;
import org.w3c.dom.Entity;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.ProcessingInstruction;
import org.w3c.dom.Text;

/**
 * This class adds implementation for normalizeDocument method.
 * It acts as if the document was going through a save and load cycle, putting
 * the document in a "normal" form. The actual result depends on the features being set
 * and governing what operations actually take place. See setNormalizationFeature for details.
 * Noticeably this method normalizes Text nodes, makes the document "namespace wellformed",
 * according to the algorithm described below in pseudo code, by adding missing namespace
 * declaration attributes and adding or changing namespace prefixes, updates the replacement
 * tree of EntityReference nodes, normalizes attribute values, etc.
 * Mutation events, when supported, are generated to reflect the changes occuring on the
 * document.
 * See Namespace normalization for details on how namespace declaration attributes and prefixes
 * are normalized.
 * 
 * NOTE: There is an initial support for DOM revalidation with XML Schema as a grammar.
 * The tree might not be validated correctly if entityReferences, CDATA sections are
 * present in the tree. The PSVI information is not exposed, normalized data (including element
 * default content is not available).
 *
 * @xerces.experimental
 * 
 * @author Elena Litani, IBM
 * @author Neeraj Bajaj, Sun Microsystems, inc.
 * @version $Id: DOMNormalizer.java 677489 2008-07-17 02:34:20Z mrglavas $
 */
public class DOMNormalizer implements XMLDocumentHandler {

    //
    // constants
    //
    /** Debug normalize document*/
    protected final static boolean DEBUG_ND = false;
    /** Debug namespace fix up algorithm*/
    protected final static boolean DEBUG = false;
    /** Debug document handler events */
    protected final static boolean DEBUG_EVENTS = false;

    /** prefix added by namespace fixup algorithm should follow a pattern "NS" + index*/
    protected final static String PREFIX = "NS";

    //
    // Data
    //
    protected DOMConfigurationImpl fConfiguration = null;
    protected CoreDocumentImpl fDocument = null;
    protected final XMLAttributesProxy fAttrProxy = new XMLAttributesProxy();
    protected final QName fQName = new QName();

    /** Validation handler represents validator instance. */
    protected RevalidationHandler fValidationHandler;

    /** symbol table */
    protected SymbolTable fSymbolTable;
    /** error handler. may be null. */
    protected DOMErrorHandler fErrorHandler;
    
    /**
     * Cached {@link DOMError} impl.
     * The same object is re-used to report multiple errors.
     */
    private final DOMErrorImpl fError = new DOMErrorImpl();
    
    // Validation against namespace aware grammar
    protected boolean fNamespaceValidation = false;

    // Update PSVI information in the tree
    protected boolean fPSVI = false;

    /** The namespace context of this document: stores namespaces in scope */
    protected final NamespaceContext fNamespaceContext = new NamespaceSupport();

    /** Stores all namespace bindings on the current element */
    protected final NamespaceContext fLocalNSBinder = new NamespaceSupport();

    /** list of attributes */
    protected final ArrayList fAttributeList = new ArrayList(5);

    /** DOM Locator -  for namespace fixup algorithm */
    protected final DOMLocatorImpl fLocator = new DOMLocatorImpl();

    /** for setting the PSVI */
    protected Node fCurrentNode = null;
    private final QName fAttrQName = new QName();
    
    // attribute value normalization
    final XMLString fNormalizedValue = new XMLString(new char[16], 0, 0);
    
    /**
     * If the user stops the process, this exception will be thrown.
     */
    public static final RuntimeException abort = new RuntimeException();
    
    /** Empty string to pass to the validator. **/
    public static final XMLString EMPTY_STRING = new XMLString();
    
    // Check if element content is all "ignorable whitespace"
    private boolean fAllWhitespace = false;
    
    // Constructor
    // 

    public DOMNormalizer(){}



    /**
     * Normalizes document.
     * Note: reset() must be called before this method.
     */
    protected void normalizeDocument(CoreDocumentImpl document, DOMConfigurationImpl config) {
        
        fDocument = document;
        fConfiguration = config;
        fAllWhitespace = false;
        fNamespaceValidation = false;
        
        String xmlVersion = fDocument.getXmlVersion();
        String schemaType = null;
        String [] schemaLocations = null;
        
        // intialize and reset DOMNormalizer component
        // 
        fSymbolTable = (SymbolTable) fConfiguration.getProperty(DOMConfigurationImpl.SYMBOL_TABLE);
        // reset namespace context
        fNamespaceContext.reset();
        fNamespaceContext.declarePrefix(XMLSymbols.EMPTY_STRING, null);
        
        if ((fConfiguration.features & DOMConfigurationImpl.VALIDATE) != 0) {
            String schemaLang = (String)fConfiguration.getProperty(DOMConfigurationImpl.JAXP_SCHEMA_LANGUAGE);
            
            if (schemaLang != null && schemaLang.equals(Constants.NS_XMLSCHEMA)) {
                schemaType = XMLGrammarDescription.XML_SCHEMA;
                fValidationHandler = CoreDOMImplementationImpl.singleton.getValidator(schemaType, xmlVersion);
                fConfiguration.setFeature(DOMConfigurationImpl.SCHEMA, true);
                fConfiguration.setFeature(DOMConfigurationImpl.SCHEMA_FULL_CHECKING, true);
                // report fatal error on DOM Level 1 nodes
                fNamespaceValidation = true;              
                
                // check if we need to fill in PSVI
                fPSVI = ((fConfiguration.features & DOMConfigurationImpl.PSVI) !=0)?true:false;       
            }
            else {
                schemaType = XMLGrammarDescription.XML_DTD;
                if (schemaLang != null) {
                    schemaLocations = (String []) fConfiguration.getProperty(DOMConfigurationImpl.JAXP_SCHEMA_SOURCE);
                }
                fConfiguration.setDTDValidatorFactory(xmlVersion);
                fValidationHandler = CoreDOMImplementationImpl.singleton.getValidator(schemaType, xmlVersion);
                fPSVI = false;
            }
            
            fConfiguration.setFeature(DOMConfigurationImpl.XERCES_VALIDATION, true);       
            
            // reset ID table           
            fDocument.clearIdentifiers();
            
            if (fValidationHandler != null) {
                // reset the validation handler
                ((XMLComponent) fValidationHandler).reset(fConfiguration);
            }
        }
        else {
            fValidationHandler = null;
        }
        
        fErrorHandler = (DOMErrorHandler) fConfiguration.getParameter(Constants.DOM_ERROR_HANDLER);
        if (fValidationHandler != null) {
            fValidationHandler.setDocumentHandler(this);
            fValidationHandler.startDocument(
                    new SimpleLocator(fDocument.fDocumentURI, fDocument.fDocumentURI,
                            -1, -1 ), fDocument.encoding, fNamespaceContext, null);
            fValidationHandler.xmlDecl(fDocument.getXmlVersion(), 
                    fDocument.getXmlEncoding(), fDocument.getXmlStandalone() ? "yes" : "no", null);
        }
        try {
            if (schemaType == XMLGrammarDescription.XML_DTD) {
                processDTD(xmlVersion, schemaLocations != null ? schemaLocations[0] : null);
            }            
            
            Node kid, next;
            for (kid = fDocument.getFirstChild(); kid != null; kid = next) {
                next = kid.getNextSibling();
                kid = normalizeNode(kid);
                if (kid != null) { // don't advance
                    next = kid;
                }
            }
            
            // release resources
            if (fValidationHandler != null) {
                fValidationHandler.endDocument(null);
                fValidationHandler.setDocumentHandler(null);
                CoreDOMImplementationImpl.singleton.releaseValidator(schemaType, xmlVersion, fValidationHandler);
                fValidationHandler = null;
            }
        }
        catch (RuntimeException e) {
            // release resources
            if (fValidationHandler != null) {
                fValidationHandler.setDocumentHandler(null);
                CoreDOMImplementationImpl.singleton.releaseValidator(schemaType, xmlVersion, fValidationHandler);
                fValidationHandler = null;
            }
            if (e == abort) {
                return; // processing aborted by the user
            }
            throw e; // otherwise re-throw.
        }
    }

    /**
     * 
     * This method acts as if the document was going through a save
     * and load cycle, putting the document in a "normal" form. The actual result
     * depends on the features being set and governing what operations actually
     * take place. See setNormalizationFeature for details. Noticeably this method
     * normalizes Text nodes, makes the document "namespace wellformed",
     * according to the algorithm described below in pseudo code, by adding missing
     * namespace declaration attributes and adding or changing namespace prefixes, updates
     * the replacement tree of EntityReference nodes,normalizes attribute values, etc.
     * 
     * @param node   Modified node or null. If node is returned, we need
     *               to normalize again starting on the node returned.
     * @return  the normalized Node
     */
    protected Node normalizeNode (Node node){

        int type = node.getNodeType();
        boolean wellformed;
        fLocator.fRelatedNode=node;
        
        switch (type) {
        case Node.DOCUMENT_TYPE_NODE: {
                if (DEBUG_ND) {
                    System.out.println("==>normalizeNode:{doctype}");
                }
                // REVISIT: well-formedness encoding info
                break;
            }

        case Node.ELEMENT_NODE: {  
                if (DEBUG_ND) {
                    System.out.println("==>normalizeNode:{element} "+node.getNodeName());
                }
                
                //do the name check only when version of the document was changed &
                //application has set the value of well-formed features to true
                if (fDocument.errorChecking) {
                    if ( ((fConfiguration.features & DOMConfigurationImpl.WELLFORMED) != 0) && 
                            fDocument.isXMLVersionChanged()){
                        if (fNamespaceValidation){
                            wellformed = CoreDocumentImpl.isValidQName(node.getPrefix() , node.getLocalName(), fDocument.isXML11Version());
                        }
                        else {
                            wellformed = CoreDocumentImpl.isXMLName(node.getNodeName() , fDocument.isXML11Version());
                        }
                        if (!wellformed){
                            String msg = DOMMessageFormatter.formatMessage(
                                    DOMMessageFormatter.DOM_DOMAIN, 
                                    "wf-invalid-character-in-node-name", 
                                    new Object[]{"Element", node.getNodeName()});
                            reportDOMError(fErrorHandler, fError, fLocator, msg, DOMError.SEVERITY_ERROR, 
                            "wf-invalid-character-in-node-name");                       
                        }
                    }
                }
                // push namespace context
                fNamespaceContext.pushContext();
                fLocalNSBinder.reset();

                ElementImpl elem = (ElementImpl)node;
                if (elem.needsSyncChildren()) {
                    elem.synchronizeChildren();
                }
                AttributeMap attributes = (elem.hasAttributes()) ? (AttributeMap) elem.getAttributes() : null; 

                // fix namespaces and remove default attributes
                if ((fConfiguration.features & DOMConfigurationImpl.NAMESPACES) !=0) {
                    // fix namespaces
                    // normalize attribute values
                    // remove default attributes
                    namespaceFixUp(elem, attributes);
                    
                    if ((fConfiguration.features & DOMConfigurationImpl.NSDECL) == 0 && attributes != null ) {
                        for (int i = 0; i < attributes.getLength(); ++i) {
                            Attr att = (Attr)attributes.getItem(i);
                            if (XMLSymbols.PREFIX_XMLNS.equals(att.getPrefix()) ||
                                XMLSymbols.PREFIX_XMLNS.equals(att.getName())) {
                                elem.removeAttributeNode(att);
                                --i;
                            }
                        }
                    }  
                    
                } else {
                    if ( attributes!=null ) {
                        for ( int i=0; inormalizeNode:{comments}");
                }

                if ((fConfiguration.features & DOMConfigurationImpl.COMMENTS) == 0) {
                    Node prevSibling = node.getPreviousSibling();
                    Node parent = node.getParentNode();
                    // remove the comment node
                    parent.removeChild(node);
                    if (prevSibling != null && prevSibling.getNodeType() == Node.TEXT_NODE) {
                        Node nextSibling = prevSibling.getNextSibling();
                        if (nextSibling != null && nextSibling.getNodeType() == Node.TEXT_NODE) {
                            ((TextImpl)nextSibling).insertData(0, prevSibling.getNodeValue());
                            parent.removeChild(prevSibling);
                            return nextSibling;
                        }
                    }
                }//if comment node need not be removed
                else {
                    if (fDocument.errorChecking && ((fConfiguration.features & DOMConfigurationImpl.WELLFORMED) != 0)){
                        String commentdata = ((Comment)node).getData();
                        // check comments for invalid xml chracter as per the version
                        // of the document                            
                        isCommentWF(fErrorHandler, fError, fLocator, commentdata, fDocument.isXML11Version());                        
                    }
                    if (fValidationHandler != null) {
                        // Don't bother filling an XMLString with the text of the comment.
                        // We only send the comment event to the validator handler so that
                        // when  the schema-type is DTD an error will be reported for a
                        // comment appearing in EMPTY content.
                        fValidationHandler.comment(EMPTY_STRING, null);
                    }         
                }//end-else if comment node is not to be removed.
				break;
            }
        case Node.ENTITY_REFERENCE_NODE: { 
                if (DEBUG_ND) {
                    System.out.println("==>normalizeNode:{entityRef} "+node.getNodeName());
                }

                if ((fConfiguration.features & DOMConfigurationImpl.ENTITIES) == 0) {
                    Node prevSibling = node.getPreviousSibling();
                    Node parent = node.getParentNode();
                    ((EntityReferenceImpl)node).setReadOnly(false, true);
                    expandEntityRef (parent, node);
                    parent.removeChild(node);
                    Node next = (prevSibling != null)?prevSibling.getNextSibling():parent.getFirstChild();
                    // The list of children #text -> &ent;
                    // and entity has a first child as a text
                    // we should not advance
                    if (prevSibling != null && next != null && prevSibling.getNodeType() == Node.TEXT_NODE && 
                        next.getNodeType() == Node.TEXT_NODE) {
                        return prevSibling;  // Don't advance                          
                    }
                    return next;
                } else {
                    if (fDocument.errorChecking && ((fConfiguration.features & DOMConfigurationImpl.WELLFORMED) != 0) && 
                        fDocument.isXMLVersionChanged()){
                            CoreDocumentImpl.isXMLName(node.getNodeName() , fDocument.isXML11Version());                    
                    }
                    // REVISIT: traverse entity reference and send appropriate calls to the validator
                    // (no normalization should be performed for the children).
                }
                break;
            }

        case Node.CDATA_SECTION_NODE: {
                if (DEBUG_ND) {
                    System.out.println("==>normalizeNode:{cdata}");
                }
                
                if ((fConfiguration.features & DOMConfigurationImpl.CDATA) == 0) {
                    // convert CDATA to TEXT nodes
                    Node prevSibling = node.getPreviousSibling();
                    if (prevSibling != null && prevSibling.getNodeType() == Node.TEXT_NODE){
                        ((Text)prevSibling).appendData(node.getNodeValue());
                        node.getParentNode().removeChild(node);
                        return prevSibling; //don't advance                        
                    }
                    else {
                        Text text = fDocument.createTextNode(node.getNodeValue());
                        Node parent = node.getParentNode();
                        node = parent.replaceChild(text, node);
                        return text;  //don't advance
                        
                    }
                }

                // send characters call for CDATA
                if (fValidationHandler != null) {
                    // set error node in the dom error wrapper
                    // so if error occurs we can report an error node
                    fConfiguration.fErrorHandlerWrapper.fCurrentNode = node;
                    fCurrentNode = node;
                    fValidationHandler.startCDATA(null);
                    fValidationHandler.characterData(node.getNodeValue(), null);
                    fValidationHandler.endCDATA(null);
                }
                String value = node.getNodeValue();
                
                if ((fConfiguration.features & DOMConfigurationImpl.SPLITCDATA) != 0) {
                    int index;
                    Node parent = node.getParentNode();
                    if (fDocument.errorChecking) {
                        isXMLCharWF(fErrorHandler, fError, fLocator, node.getNodeValue(), fDocument.isXML11Version());
                    }
                    while ( (index=value.indexOf("]]>")) >= 0 ) {
                        node.setNodeValue(value.substring(0, index+2));
                        value = value.substring(index +2);
                        
                        Node firstSplitNode = node;
                        Node newChild = fDocument.createCDATASection(value);
                        parent.insertBefore(newChild, node.getNextSibling());
                        node = newChild;                      
                        // issue warning
                        fLocator.fRelatedNode = firstSplitNode;
                        String msg = DOMMessageFormatter.formatMessage(
                            DOMMessageFormatter.DOM_DOMAIN, 
                            "cdata-sections-splitted", 
                             null);
                        reportDOMError(fErrorHandler, fError, fLocator, msg, DOMError.SEVERITY_WARNING, 
                            "cdata-sections-splitted");
                    }

                }
                else if (fDocument.errorChecking) {
                    // check well-formedness
                    isCDataWF(fErrorHandler, fError, fLocator, value, fDocument.isXML11Version());
                }
                break;
            }

        case Node.TEXT_NODE: { 
                if (DEBUG_ND) {
                    System.out.println("==>normalizeNode(text):{"+node.getNodeValue()+"}");
                }
                // If node is a text node, we need to check for one of two
                // conditions:
                //   1) There is an adjacent text node
                //   2) There is no adjacent text node, but node is
                //      an empty text node.
                Node next = node.getNextSibling();
                // If an adjacent text node, merge it with this node
                if ( next!=null && next.getNodeType() == Node.TEXT_NODE ) {
                    ((Text)node).appendData(next.getNodeValue());
                    node.getParentNode().removeChild( next );
                    // We don't need to check well-formness here since we are not yet
                    // done with this node.
                    
                    return node; // Don't advance;                   
                } else if (node.getNodeValue().length()==0) {
                    // If kid is empty, remove it
                    node.getParentNode().removeChild( node );
                } else {                    
                    // validator.characters() call and well-formness
                    // Don't send characters or check well-formness in the following cases:
                    // 1. entities is false, next child is entity reference: expand tree first
                    // 2. comments is false, and next child is comment
                    // 3. cdata is false, and next child is cdata
                  
                    short nextType = (next != null)?next.getNodeType():-1;
                    if (nextType == -1 || !(((fConfiguration.features & DOMConfigurationImpl.ENTITIES) == 0 &&
                            nextType == Node.ENTITY_NODE) ||
                            ((fConfiguration.features & DOMConfigurationImpl.COMMENTS) == 0 &&
                                    nextType == Node.COMMENT_NODE) ||
                                    ((fConfiguration.features & DOMConfigurationImpl.CDATA) == 0) &&
                                    nextType == Node.CDATA_SECTION_NODE)) {
                        if (fDocument.errorChecking && ((fConfiguration.features & DOMConfigurationImpl.WELLFORMED) != 0) ){
                            isXMLCharWF(fErrorHandler, fError, fLocator, node.getNodeValue(), fDocument.isXML11Version());
                        }                              
                        if (fValidationHandler != null) {
                            fConfiguration.fErrorHandlerWrapper.fCurrentNode = node;
                            fCurrentNode = node;
                            fValidationHandler.characterData(node.getNodeValue(), null);
                            if (!fNamespaceValidation) {
                                if (fAllWhitespace) {
                                    fAllWhitespace = false;
                                    ((TextImpl)node).setIgnorableWhitespace(true);
                                }
                                else {
                                    ((TextImpl)node).setIgnorableWhitespace(false);
                                }
                            }
                            if (DEBUG_ND) {
                                System.out.println("=====>characterData(),"+nextType);
                            }
                        }  
                    }
                    else {
                        if (DEBUG_ND) {
                            System.out.println("=====>don't send characters(),"+nextType);

                        }
                    }
                }
                break;
            }        
        case Node.PROCESSING_INSTRUCTION_NODE: {
            
            //do the well-formed valid PI target name , data check when application has set the value of well-formed feature to true
            if (fDocument.errorChecking && (fConfiguration.features & DOMConfigurationImpl.WELLFORMED) != 0 ) {
                ProcessingInstruction pinode = (ProcessingInstruction)node ;

                String target = pinode.getTarget();
                //1.check PI target name
                if(fDocument.isXML11Version()){
                    wellformed = XML11Char.isXML11ValidName(target);
                }
                else{                
                    wellformed = XMLChar.isValidName(target);
                }

				if (!wellformed) {
				    String msg = DOMMessageFormatter.formatMessage(
				        DOMMessageFormatter.DOM_DOMAIN, 
				        "wf-invalid-character-in-node-name", 
				        new Object[]{"Element", node.getNodeName()});
                    reportDOMError(fErrorHandler, fError, fLocator, msg, DOMError.SEVERITY_ERROR,  
                        "wf-invalid-character-in-node-name");
                }        
                                
                //2. check PI data
                //processing isntruction data may have certain characters
                //which may not be valid XML character               
                isXMLCharWF(fErrorHandler, fError, fLocator, pinode.getData(), fDocument.isXML11Version());
            }
            
            if (fValidationHandler != null) {
                // Don't bother filling an XMLString with the data section of the
                // processing instruction. We only send the processing instruction
                // event to the validator handler so that when the schema-type is 
                // DTD an error will be reported for a processing instruction
                // appearing in EMPTY content.
                fValidationHandler.processingInstruction(((ProcessingInstruction) node).getTarget(), EMPTY_STRING, null);
            } 
        }//end case Node.PROCESSING_INSTRUCTION_NODE
        
        }//end of switch
        return null;
    }//normalizeNode

    private void processDTD(String xmlVersion, String schemaLocation) {
        
        String rootName = null;
        String publicId = null;
        String systemId = schemaLocation;
        String baseSystemId = fDocument.getDocumentURI();
        String internalSubset = null;
        
        DocumentType docType = fDocument.getDoctype();
        if (docType != null) {
            rootName = docType.getName();
            publicId = docType.getPublicId();
            if (systemId == null || systemId.length() == 0) {
                systemId = docType.getSystemId();
            }
            internalSubset = docType.getInternalSubset();
        }
        // If the DOM doesn't have a DocumentType node we may still
        // be able to fetch a DTD if the application provided a URI
        else {
            Element elem = fDocument.getDocumentElement();
            if (elem == null) return;
            rootName = elem.getNodeName();
            if (systemId == null || systemId.length() == 0) return;
        }
        
        XMLDTDLoader loader = null;
        try {
            fValidationHandler.doctypeDecl(rootName, publicId, systemId, null);
            loader = CoreDOMImplementationImpl.singleton.getDTDLoader(xmlVersion);
            loader.setFeature(DOMConfigurationImpl.XERCES_VALIDATION, true);
            loader.setEntityResolver(fConfiguration.getEntityResolver());
            loader.setErrorHandler(fConfiguration.getErrorHandler());
            loader.loadGrammarWithContext((XMLDTDValidator) fValidationHandler, rootName, 
                    publicId, systemId, baseSystemId, internalSubset);
        }
        // REVISIT: Should probably report this exception to the error handler.
        catch (IOException e) {   
        }
        finally {
            if (loader != null) {
                CoreDOMImplementationImpl.singleton.releaseDTDLoader(xmlVersion, loader);
            }
        }
    } // processDTD(String, String)

    protected final void expandEntityRef (Node parent, Node reference){
        Node kid, next;
        for (kid = reference.getFirstChild(); kid != null; kid = next) {
            next = kid.getNextSibling();
            parent.insertBefore(kid, reference);
        }
    }

    // fix namespaces
    // normalize attribute values
    // remove default attributes
    // check attribute names if the version of the document changed.
    
    protected final void namespaceFixUp (ElementImpl element, AttributeMap attributes){
        if (DEBUG) {
            System.out.println("[ns-fixup] element:" +element.getNodeName()+
                               " uri: "+element.getNamespaceURI());
        }

        // ------------------------------------
        // pick up local namespace declarations
        // 
        //   
        //   
        //
        // ------------------------------------

        String value, uri, prefix;
        if (attributes != null) {

            // Record all valid local declarations
            for (int k = 0; k < attributes.getLength(); ++k) {
                Attr attr = (Attr)attributes.getItem(k);
                uri = attr.getNamespaceURI();
                if (uri != null && uri.equals(NamespaceContext.XMLNS_URI)) {
                    // namespace attribute
                    value = attr.getNodeValue();
                    if (value == null) {
                        value=XMLSymbols.EMPTY_STRING;
                    }

                    // Check for invalid namespace declaration:
                    if (fDocument.errorChecking && value.equals(NamespaceContext.XMLNS_URI)) {
                    	//A null value for locale is passed to formatMessage, 
                    	//which means that the default locale will be used
                        fLocator.fRelatedNode = attr;
                        String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.XML_DOMAIN,"CantBindXMLNS",null );
                        reportDOMError(fErrorHandler, fError, fLocator, msg, DOMError.SEVERITY_ERROR, "CantBindXMLNS");
                    } else {
                        // XML 1.0 Attribute value normalization
                        // value = normalizeAttributeValue(value, attr);
                        prefix = attr.getPrefix();
                        prefix = (prefix == null || 
                                  prefix.length() == 0) ? XMLSymbols.EMPTY_STRING :fSymbolTable.addSymbol(prefix);
                        String localpart = fSymbolTable.addSymbol( attr.getLocalName());
                        if (prefix == XMLSymbols.PREFIX_XMLNS) { //xmlns:prefix

                            value = fSymbolTable.addSymbol(value);
                            if (value.length() != 0) {
                                fNamespaceContext.declarePrefix(localpart, value);
                            } else {
                                // REVISIT: issue error on invalid declarations
                                //          xmlns:foo = ""

                            }
                            //removeDefault (attr, attributes);
                            continue;
                        } else { // (localpart == fXmlnsSymbol && prefix == fEmptySymbol)  -- xmlns
                            // empty prefix is always bound ("" or some string)
                            value = fSymbolTable.addSymbol(value);
                            fNamespaceContext.declarePrefix(XMLSymbols.EMPTY_STRING, value.length() != 0 ? value : null);
                            //removeDefault (attr, attributes);
                            continue;
                        }
                    }  // end-else: valid declaration
                } // end-if: namespace attribute
            }
        }



        // ---------------------------------------------------------
        // Fix up namespaces for element: per DOM L3 
        // Need to consider the following cases:
        //
        // case 1: 
        // We create another element body bound to the "http://xsl" namespace
        // as well as namespace attribute rebounding xsl to another namespace.
        // 
        // Need to make sure that the new namespace decl value is changed to 
        // "http://xsl"
        //
        // ---------------------------------------------------------
        // check if prefix/namespace is correct for current element
        // ---------------------------------------------------------

        uri = element.getNamespaceURI();
        prefix = element.getPrefix();
        if (uri != null) {  // Element has a namespace
            uri = fSymbolTable.addSymbol(uri);
            prefix = (prefix == null || 
                      prefix.length() == 0) ? XMLSymbols.EMPTY_STRING :fSymbolTable.addSymbol(prefix);
            if (fNamespaceContext.getURI(prefix) == uri) {
                // The xmlns:prefix=namespace or xmlns="default" was declared at parent.
                // The binder always stores mapping of empty prefix to "".
            } else {
                // the prefix is either undeclared 
                // or
                // conflict: the prefix is bound to another URI
                addNamespaceDecl(prefix, uri, element);
                fLocalNSBinder.declarePrefix(prefix, uri);
                fNamespaceContext.declarePrefix(prefix, uri);
            }
        } else { // Element has no namespace
            if (element.getLocalName() == null) {
            	
                //  Error: DOM Level 1 node!
                if (fNamespaceValidation) {
                    String msg = DOMMessageFormatter.formatMessage(
                            DOMMessageFormatter.DOM_DOMAIN, "NullLocalElementName", 
                            new Object[]{element.getNodeName()});
                    reportDOMError(fErrorHandler, fError, fLocator, msg, DOMError.SEVERITY_FATAL_ERROR, 
                    "NullLocalElementName");
                } else {
                    String msg = DOMMessageFormatter.formatMessage(
                            DOMMessageFormatter.DOM_DOMAIN, "NullLocalElementName", 
                            new Object[]{element.getNodeName()});
                    reportDOMError(fErrorHandler, fError, fLocator, msg, DOMError.SEVERITY_ERROR, 
                    "NullLocalElementName");
                }
            	
            } else { // uri=null and no colon (DOM L2 node)
                uri = fNamespaceContext.getURI(XMLSymbols.EMPTY_STRING);
                if (uri !=null && uri.length() > 0) {
                    // undeclare default namespace declaration (before that element
                    // bound to non-zero length uir), but adding xmlns="" decl                    
                    addNamespaceDecl (XMLSymbols.EMPTY_STRING, XMLSymbols.EMPTY_STRING, element);
                    fLocalNSBinder.declarePrefix(XMLSymbols.EMPTY_STRING, null);
                    fNamespaceContext.declarePrefix(XMLSymbols.EMPTY_STRING, null);
                }
            }
        }

        // -----------------------------------------
        // Fix up namespaces for attributes: per DOM L3 
        // check if prefix/namespace is correct the attributes
        // -----------------------------------------
        if (attributes != null) {

            // clone content of the attributes
            attributes.cloneMap(fAttributeList);
            for (int i = 0; i < fAttributeList.size(); i++) {
                Attr attr = (Attr) fAttributeList.get(i);
                fLocator.fRelatedNode = attr;

                if (DEBUG) {
                    System.out.println("==>[ns-fixup] process attribute: "+attr.getNodeName());
                }
                // normalize attribute value
                attr.normalize();                
                value = attr.getValue();           
                uri = attr.getNamespaceURI();

                // make sure that value is never null.
                if (value == null) {
                    value = XMLSymbols.EMPTY_STRING;
                }
                
                //---------------------------------------
                // check if value of the attribute is namespace well-formed
                //---------------------------------------
                if (fDocument.errorChecking && ((fConfiguration.features & DOMConfigurationImpl.WELLFORMED) != 0)) {
                    isAttrValueWF(fErrorHandler, fError, fLocator, attributes, attr, value, fDocument.isXML11Version());
                    if (fDocument.isXMLVersionChanged()) {
                        boolean wellformed;
                        if (fNamespaceValidation){
                            wellformed = CoreDocumentImpl.isValidQName(attr.getPrefix(), attr.getLocalName(), fDocument.isXML11Version());
                        }
                        else {
                            wellformed = CoreDocumentImpl.isXMLName(attr.getNodeName(), fDocument.isXML11Version());
                        }
                        if (!wellformed) {
                            String msg = DOMMessageFormatter.formatMessage(
                                    DOMMessageFormatter.DOM_DOMAIN, 
                                    "wf-invalid-character-in-node-name", 
                                    new Object[]{"Attr", attr.getNodeName()});
                            reportDOMError(fErrorHandler, fError, fLocator, msg, DOMError.SEVERITY_ERROR, 
                            "wf-invalid-character-in-node-name");
                        }
                    }           
                }

                if (uri != null) {  // attribute has namespace !=null
                    prefix = attr.getPrefix();
                    prefix = (prefix == null || 
                              prefix.length() == 0) ? XMLSymbols.EMPTY_STRING :fSymbolTable.addSymbol(prefix);
                    /*String localpart =*/ fSymbolTable.addSymbol( attr.getLocalName());

                    // ---------------------------------------
                    // skip namespace declarations 
                    // ---------------------------------------
                    // REVISIT: can we assume that "uri" is from some symbol
                    // table, and compare by reference? -SG
                    if (uri != null && uri.equals(NamespaceContext.XMLNS_URI)) {
                        continue;
                    }

                    // ---------------------------------------
                    // remove default attributes
                    // ---------------------------------------
                    /* 
                    if (removeDefault(attr, attributes)) {
                        continue;
                    }
                    */
                    // XML 1.0 Attribute value normalization
                    //value = normalizeAttributeValue(value, attr);
                    
                    // reset id-attributes
                    ((AttrImpl)attr).setIdAttribute(false);

                    uri = fSymbolTable.addSymbol(uri);

                    // find if for this prefix a URI was already declared
                    String declaredURI =  fNamespaceContext.getURI(prefix);

                    if (prefix == XMLSymbols.EMPTY_STRING || declaredURI != uri) {
                        // attribute has no prefix (default namespace decl does not apply to attributes) 
                        // OR
                        // attribute prefix is not declared
                        // OR
                        // conflict: attribute has a prefix that conficlicts with a binding
                        //           already active in scope

                        // Find if any prefix for attributes namespace URI is available
                        // in the scope
                        String declaredPrefix = fNamespaceContext.getPrefix(uri);
                        if (declaredPrefix !=null && declaredPrefix !=XMLSymbols.EMPTY_STRING) {

                            // use the prefix that was found (declared previously for this URI
                            prefix = declaredPrefix;
                        } else {
                            if (prefix != XMLSymbols.EMPTY_STRING && fLocalNSBinder.getURI(prefix) == null) {
                                // the current prefix is not null and it has no in scope declaration

                                // use this prefix
                            } else {

                                // find a prefix following the pattern "NS" +index (starting at 1)
                                // make sure this prefix is not declared in the current scope.
                                int counter = 1;
                                prefix = fSymbolTable.addSymbol(PREFIX +counter++);
                                while (fLocalNSBinder.getURI(prefix)!=null) {
                                    prefix = fSymbolTable.addSymbol(PREFIX +counter++);
                                }

                            }
                            // add declaration for the new prefix
                            addNamespaceDecl(prefix, uri, element);
                            value = fSymbolTable.addSymbol(value);
                            fLocalNSBinder.declarePrefix(prefix, value);
                            fNamespaceContext.declarePrefix(prefix, uri);
                        }

                        // change prefix for this attribute
                        attr.setPrefix(prefix);
                    }
                } else { // attribute uri == null

                    // XML 1.0 Attribute value normalization
                    //value = normalizeAttributeValue(value, attr);
                    
                    // reset id-attributes
                    ((AttrImpl)attr).setIdAttribute(false);

                    if (attr.getLocalName() == null) {
                        // It is an error if document has DOM L1 nodes.
                        if (fNamespaceValidation) {
                            String msg = DOMMessageFormatter.formatMessage(
                                DOMMessageFormatter.DOM_DOMAIN, 
                                "NullLocalAttrName", new Object[]{attr.getNodeName()});
                            reportDOMError(fErrorHandler, fError, fLocator, msg, DOMError.SEVERITY_FATAL_ERROR, 
                                "NullLocalAttrName");
                        } else {
                            String msg = DOMMessageFormatter.formatMessage(
                                DOMMessageFormatter.DOM_DOMAIN, 
                                "NullLocalAttrName", new Object[]{attr.getNodeName()});
                            reportDOMError(fErrorHandler, fError, fLocator, msg, DOMError.SEVERITY_ERROR, 
                                "NullLocalAttrName");
                        }
                    } else {
                        // uri=null and no colon
                        // no fix up is needed: default namespace decl does not 

                        // ---------------------------------------
                        // remove default attributes
                        // ---------------------------------------
                        // removeDefault(attr, attributes);
                    }
                }
            }
        } // end loop for attributes
    }
    
    /**
     * Adds a namespace attribute or replaces the value of existing namespace
     * attribute with the given prefix and value for URI.
     * In case prefix is empty will add/update default namespace declaration.
     * 
     * @param prefix
     * @param uri
     * @exception IOException
     */

    protected final void addNamespaceDecl(String prefix, String uri, ElementImpl element){
        if (DEBUG) {
            System.out.println("[ns-fixup] addNamespaceDecl ["+prefix+"]");
        }
        if (prefix == XMLSymbols.EMPTY_STRING) {
            if (DEBUG) {
                System.out.println("=>add xmlns=\""+uri+"\" declaration");
            }
            element.setAttributeNS(NamespaceContext.XMLNS_URI, XMLSymbols.PREFIX_XMLNS, uri);             
        } else {
            if (DEBUG) {
                System.out.println("=>add xmlns:"+prefix+"=\""+uri+"\" declaration");
            }
            element.setAttributeNS(NamespaceContext.XMLNS_URI, "xmlns:"+prefix, uri); 
        }
    }
    
    
    //
    // Methods for well-formness checking
    //
    
    
    /**
     * Check if CDATA section is well-formed
     * @param datavalue
     * @param isXML11Version = true if XML 1.1
     */
    public static final void isCDataWF(DOMErrorHandler errorHandler, DOMErrorImpl error, DOMLocatorImpl locator, 
        String datavalue, boolean isXML11Version)
    {
        if (datavalue == null || (datavalue.length() == 0) ) {
            return;
        }
        
        char [] dataarray = datavalue.toCharArray(); 
        int datalength = dataarray.length;
        
        // version of the document is XML 1.1
        if (isXML11Version) {                    
            // we need to check all chracters as per production rules of XML11
            int i = 0;
            while(i < datalength){     
                char c = dataarray[i++];                                      
                if ( XML11Char.isXML11Invalid(c) ) {
                    // check if this is a supplemental character
                    if (XMLChar.isHighSurrogate(c) && i < datalength) {
                        char c2 = dataarray[i++];
                        if (XMLChar.isLowSurrogate(c2) && 
                            XMLChar.isSupplemental(XMLChar.supplemental(c, c2))) {
                            continue;
                        }
                    }
                    String msg = DOMMessageFormatter.formatMessage(
                        DOMMessageFormatter.XML_DOMAIN,
                        "InvalidCharInCDSect",
                        new Object[] { Integer.toString(c, 16)});
                    reportDOMError(
                        errorHandler,
                        error,
                        locator,
                        msg,
                        DOMError.SEVERITY_ERROR,
                        "wf-invalid-character");
                }
                else if (c == ']') {
                    int count = i;
                    if (count < datalength && dataarray[count] == ']') {
                        while (++count < datalength && dataarray[count] == ']') {
                            // do nothing
                        }
                        if (count < datalength && dataarray[count] == '>') {
                            // CDEndInContent
                            String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.XML_DOMAIN, "CDEndInContent", null);
                            reportDOMError(errorHandler, error, locator,msg, DOMError.SEVERITY_ERROR, "wf-invalid-character");
                        }
                    }
                    
                }
            }
        } // version of the document is XML 1.0
        else {                    
            // we need to check all chracters as per production rules of XML 1.0
            int i = 0;
            while (i < datalength) {   
                char c = dataarray[i++];                         
                if( XMLChar.isInvalid(c) ) {
                    // check if this is a supplemental character
                    if (XMLChar.isHighSurrogate(c) && i < datalength) {
                        char c2 = dataarray[i++];
                        if (XMLChar.isLowSurrogate(c2) && 
                            XMLChar.isSupplemental(XMLChar.supplemental(c, c2))) {
                            continue;
                        }
                    }
                    // Note:  The key InvalidCharInCDSect from XMLMessages.properties
                    // is being used to obtain the message and DOM error type
                    // "wf-invalid-character" is used.  Also per DOM it is error but 
                    // as per XML spec. it is fatal error
                    String msg = DOMMessageFormatter.formatMessage(
                        DOMMessageFormatter.XML_DOMAIN, 
                        "InvalidCharInCDSect", 
                        new Object[]{Integer.toString(c, 16)});
                    reportDOMError(errorHandler, error, locator, msg, DOMError.SEVERITY_ERROR, "wf-invalid-character");
                }
                else if (c==']') {
                    int count = i;
                    if ( count< datalength && dataarray[count]==']' ) {
                        while (++count < datalength && dataarray[count]==']' ) {
                            // do nothing
                        }
                        if ( count < datalength && dataarray[count]=='>' ) {
                            String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.XML_DOMAIN, "CDEndInContent", null);
                            reportDOMError(errorHandler, error, locator, msg, DOMError.SEVERITY_ERROR, "wf-invalid-character");
                        }
                    }
                    
                }
            }            
        } // end-else fDocument.isXMLVersion()
        
    } // isCDataWF
     
    /**
     * NON-DOM: check for valid XML characters as per the XML version
     * @param datavalue
     * @param isXML11Version = true if XML 1.1
     */
    public static final void isXMLCharWF(DOMErrorHandler errorHandler, DOMErrorImpl error, DOMLocatorImpl locator, 
        String datavalue, boolean isXML11Version)
    {
        if ( datavalue == null || (datavalue.length() == 0) ) {
            return;      
        }
        
        char [] dataarray = datavalue.toCharArray(); 
        int datalength = dataarray.length;
        
        // version of the document is XML 1.1
        if(isXML11Version){                    
            //we need to check all characters as per production rules of XML11
            int i = 0 ;
            while (i < datalength) {                            
                if(XML11Char.isXML11Invalid(dataarray[i++])){
                    // check if this is a supplemental character
                    char ch = dataarray[i-1];
                    if (XMLChar.isHighSurrogate(ch) && i < datalength) {
                        char ch2 = dataarray[i++];
                        if (XMLChar.isLowSurrogate(ch2) && 
                            XMLChar.isSupplemental(XMLChar.supplemental(ch, ch2))) {
                            continue;
                        }
                    }
                    String msg = DOMMessageFormatter.formatMessage(
                        DOMMessageFormatter.DOM_DOMAIN, "InvalidXMLCharInDOM", 
                        new Object[]{Integer.toString(dataarray[i-1], 16)});
                    reportDOMError(errorHandler, error, locator, msg, DOMError.SEVERITY_ERROR, 
                    "wf-invalid-character");
                }
            }
        } // version of the document is XML 1.0
        else{                    
            // we need to check all characters as per production rules of XML 1.0
            int i = 0 ;
            while (i < datalength) {                            
                if( XMLChar.isInvalid(dataarray[i++]) ) {
                    // check if this is a supplemental character
                    char ch = dataarray[i-1];
                    if (XMLChar.isHighSurrogate(ch) && i < datalength) {
                        char ch2 = dataarray[i++];
                        if (XMLChar.isLowSurrogate(ch2) && 
                            XMLChar.isSupplemental(XMLChar.supplemental(ch, ch2))) {
                            continue;
                        }
                    }
                    String msg = DOMMessageFormatter.formatMessage(
                        DOMMessageFormatter.DOM_DOMAIN, "InvalidXMLCharInDOM", 
                        new Object[]{Integer.toString(dataarray[i-1], 16)});
                    reportDOMError(errorHandler, error, locator, msg, DOMError.SEVERITY_ERROR, 
                    "wf-invalid-character");
                }
            }            
        } // end-else fDocument.isXMLVersion()
        
    } // isXMLCharWF
    
    /**
     * NON-DOM: check if value of the comment is well-formed
     * @param datavalue
     * @param isXML11Version = true if XML 1.1
     */
    public static final void isCommentWF(DOMErrorHandler errorHandler, DOMErrorImpl error, DOMLocatorImpl locator, 
        String datavalue, boolean isXML11Version)
    {
        if ( datavalue == null || (datavalue.length() == 0) ) {
            return;
        }
        
        char [] dataarray = datavalue.toCharArray(); 
        int datalength = dataarray.length ;
        
        // version of the document is XML 1.1
        if (isXML11Version) {                    
            // we need to check all chracters as per production rules of XML11
            int i = 0 ;
            while (i < datalength){   
                char c = dataarray[i++];
                if ( XML11Char.isXML11Invalid(c) ) {
                    // check if this is a supplemental character
                    if (XMLChar.isHighSurrogate(c) && i < datalength) {
                        char c2 = dataarray[i++];
                        if (XMLChar.isLowSurrogate(c2) && 
                            XMLChar.isSupplemental(XMLChar.supplemental(c, c2))) {
                            continue;
                        }
                    }
                    String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.XML_DOMAIN, 
                        "InvalidCharInComment", 
                        new Object [] {Integer.toString(dataarray[i-1], 16)});
                    reportDOMError(errorHandler, error, locator, msg, DOMError.SEVERITY_ERROR, "wf-invalid-character");
                }
                else if (c == '-' && i < datalength && dataarray[i] == '-') {
                    String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.XML_DOMAIN,
                        "DashDashInComment", null);
                    // invalid: '--' in comment                   
                    reportDOMError(errorHandler, error, locator, msg, DOMError.SEVERITY_ERROR, "wf-invalid-character");
                }
            }
        } // version of the document is XML 1.0
        else {                    
            // we need to check all chracters as per production rules of XML 1.0
            int i = 0;
            while (i < datalength){ 
                char c = dataarray[i++];                           
                if( XMLChar.isInvalid(c) ){
                    // check if this is a supplemental character
                    if (XMLChar.isHighSurrogate(c) && i < datalength) {
                        char c2 = dataarray[i++];
                        if (XMLChar.isLowSurrogate(c2) && 
                            XMLChar.isSupplemental(XMLChar.supplemental(c, c2))) {
                            continue;
                        }
                    }
                    String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.XML_DOMAIN,
                        "InvalidCharInComment", new Object [] {Integer.toString(dataarray[i-1], 16)});
                    reportDOMError(errorHandler, error, locator, msg, DOMError.SEVERITY_ERROR, "wf-invalid-character");
                }  
                else if (c == '-' && istrongly
     *                 recommended that a locator be supplied that can
     *                 at least report the system identifier of the
     *                 document.
     * @param encoding The auto-detected IANA encoding name of the entity
     *                 stream. This value will be null in those situations
     *                 where the entity encoding is not auto-detected (e.g.
     *                 internal entities or a document entity that is
     *                 parsed from a java.io.Reader).
     * @param namespaceContext
     *                 The namespace context in effect at the
     *                 start of this document.
     *                 This object represents the current context.
     *                 Implementors of this class are responsible
     *                 for copying the namespace bindings from the
     *                 the current context (and its parent contexts)
     *                 if that information is important.
     *                 
     * @param augs     Additional information that may include infoset augmentations
     * @exception XNIException
     *                   Thrown by handler to signal an error.
     */
    public void startDocument(XMLLocator locator, String encoding, 
                              NamespaceContext namespaceContext,
                              Augmentations augs) 
        throws XNIException{
    }

    /**
     * Notifies of the presence of an XMLDecl line in the document. If
     * present, this method will be called immediately following the
     * startDocument call.
     * 
     * @param version    The XML version.
     * @param encoding   The IANA encoding name of the document, or null if
     *                   not specified.
     * @param standalone The standalone value, or null if not specified.
     * @param augs       Additional information that may include infoset augmentations
     *                   
     * @exception XNIException
     *                   Thrown by handler to signal an error.
     */
    public void xmlDecl(String version, String encoding, String standalone, Augmentations augs)
        throws XNIException{
    }

    /**
     * Notifies of the presence of the DOCTYPE line in the document.
     * 
     * @param rootElement
     *                 The name of the root element.
     * @param publicId The public identifier if an external DTD or null
     *                 if the external DTD is specified using SYSTEM.
     * @param systemId The system identifier if an external DTD, null
     *                 otherwise.
     * @param augs     Additional information that may include infoset augmentations
     *                 
     * @exception XNIException
     *                   Thrown by handler to signal an error.
     */
    public void doctypeDecl(String rootElement, String publicId, String systemId, Augmentations augs)
        throws XNIException{
    }

    /**
     * A comment.
     * 
     * @param text   The text in the comment.
     * @param augs   Additional information that may include infoset augmentations
     *               
     * @exception XNIException
     *                   Thrown by application to signal an error.
     */
    public void comment(XMLString text, Augmentations augs) throws XNIException{
    }

    /**
     * A processing instruction. Processing instructions consist of a
     * target name and, optionally, text data. The data is only meaningful
     * to the application.
     * 

* Typically, a processing instruction's data will contain a series * of pseudo-attributes. These pseudo-attributes follow the form of * element attributes but are not parsed or presented * to the application as anything other than text. The application is * responsible for parsing the data. * * @param target The target. * @param data The data or null if none specified. * @param augs Additional information that may include infoset augmentations * * @exception XNIException * Thrown by handler to signal an error. */ public void processingInstruction(String target, XMLString data, Augmentations augs) throws XNIException{ } /** * The start of an element. * * @param element The name of the element. * @param attributes The element attributes. * @param augs Additional information that may include infoset augmentations * * @exception XNIException * Thrown by handler to signal an error. */ public void startElement(QName element, XMLAttributes attributes, Augmentations augs) throws XNIException { Element currentElement = (Element) fCurrentNode; int attrCount = attributes.getLength(); if (DEBUG_EVENTS) { System.out.println("==>startElement: " +element+ " attrs.length="+attrCount); } for (int i = 0; i < attrCount; i++) { attributes.getName(i, fAttrQName); Attr attr = null; attr = currentElement.getAttributeNodeNS(fAttrQName.uri, fAttrQName.localpart); if (attr == null) { // Must be a non-namespace aware DOM Level 1 node. attr = currentElement.getAttributeNode(fAttrQName.rawname); } AttributePSVI attrPSVI = (AttributePSVI) attributes.getAugmentations(i).getItem(Constants.ATTRIBUTE_PSVI); if (attrPSVI != null) { //REVISIT: instead we should be using augmentations: // to set/retrieve Id attributes XSTypeDefinition decl = attrPSVI.getMemberTypeDefinition(); boolean id = false; if (decl != null) { id = ((XSSimpleType)decl).isIDType(); } else { decl = attrPSVI.getTypeDefinition(); if (decl != null) { id = ((XSSimpleType)decl).isIDType(); } } if (id) { ((ElementImpl)currentElement).setIdAttributeNode(attr, true); } if (fPSVI) { ((PSVIAttrNSImpl) attr).setPSVI(attrPSVI); } // Updating the TypeInfo for this attribute. ((AttrImpl) attr).setType(decl); if ((fConfiguration.features & DOMConfigurationImpl.DTNORMALIZATION) != 0) { // datatype-normalization // NOTE: The specified value MUST be set after we set // the node value because that turns the "specified" // flag to "true" which may overwrite a "false" // value from the attribute list. final String normalizedValue = attrPSVI.getSchemaNormalizedValue(); if (normalizedValue != null) { boolean specified = attr.getSpecified(); attr.setValue(normalizedValue); if (!specified) { ((AttrImpl) attr).setSpecified(specified); } } } } else { // DTD String type = null; boolean isDeclared = Boolean.TRUE.equals(attributes.getAugmentations(i).getItem (Constants.ATTRIBUTE_DECLARED)); // For DOM Level 3 TypeInfo, the type name must // be null if this attribute has not been declared // in the DTD. if (isDeclared) { type = attributes.getType(i); if ("ID".equals (type)) { ((ElementImpl) currentElement).setIdAttributeNode(attr, true); } } // Updating the TypeInfo for this attribute. ((AttrImpl) attr).setType(type); } } } /** * An empty element. * * @param element The name of the element. * @param attributes The element attributes. * @param augs Additional information that may include infoset augmentations * * @exception XNIException * Thrown by handler to signal an error. */ public void emptyElement(QName element, XMLAttributes attributes, Augmentations augs) throws XNIException { if (DEBUG_EVENTS) { System.out.println("==>emptyElement: " +element); } startElement(element, attributes, augs); endElement(element, augs); } /** * This method notifies the start of a general entity. *

* Note: This method is not called for entity references * appearing as part of attribute values. * * @param name The name of the general entity. * @param identifier The resource identifier. * @param encoding The auto-detected IANA encoding name of the entity * stream. This value will be null in those situations * where the entity encoding is not auto-detected (e.g. * internal entities or a document entity that is * parsed from a java.io.Reader). * @param augs Additional information that may include infoset augmentations * * @exception XNIException Thrown by handler to signal an error. */ public void startGeneralEntity(String name, XMLResourceIdentifier identifier, String encoding, Augmentations augs) throws XNIException{ } /** * Notifies of the presence of a TextDecl line in an entity. If present, * this method will be called immediately following the startEntity call. *

* Note: This method will never be called for the * document entity; it is only called for external general entities * referenced in document content. *

* Note: This method is not called for entity references * appearing as part of attribute values. * * @param version The XML version, or null if not specified. * @param encoding The IANA encoding name of the entity. * @param augs Additional information that may include infoset augmentations * * @exception XNIException * Thrown by handler to signal an error. */ public void textDecl(String version, String encoding, Augmentations augs) throws XNIException{ } /** * This method notifies the end of a general entity. *

* Note: This method is not called for entity references * appearing as part of attribute values. * * @param name The name of the entity. * @param augs Additional information that may include infoset augmentations * * @exception XNIException * Thrown by handler to signal an error. */ public void endGeneralEntity(String name, Augmentations augs) throws XNIException{ } /** * Character content. * * @param text The content. * @param augs Additional information that may include infoset augmentations * * @exception XNIException * Thrown by handler to signal an error. */ public void characters(XMLString text, Augmentations augs) throws XNIException{ } /** * Ignorable whitespace. For this method to be called, the document * source must have some way of determining that the text containing * only whitespace characters should be considered ignorable. For * example, the validator can determine if a length of whitespace * characters in the document are ignorable based on the element * content model. * * @param text The ignorable whitespace. * @param augs Additional information that may include infoset augmentations * * @exception XNIException * Thrown by handler to signal an error. */ public void ignorableWhitespace(XMLString text, Augmentations augs) throws XNIException{ fAllWhitespace = true; } /** * The end of an element. * * @param element The name of the element. * @param augs Additional information that may include infoset augmentations * * @exception XNIException * Thrown by handler to signal an error. */ public void endElement(QName element, Augmentations augs) throws XNIException { if (DEBUG_EVENTS) { System.out.println("==>endElement: " + element); } if (augs != null) { ElementPSVI elementPSVI = (ElementPSVI) augs.getItem(Constants.ELEMENT_PSVI); if (elementPSVI != null) { ElementImpl elementNode = (ElementImpl) fCurrentNode; if (fPSVI) { ((PSVIElementNSImpl) fCurrentNode).setPSVI(elementPSVI); } // Updating the TypeInfo for this element. if (elementNode instanceof ElementNSImpl) { XSTypeDefinition type = elementPSVI.getMemberTypeDefinition(); if (type == null) { type = elementPSVI.getTypeDefinition(); } ((ElementNSImpl) elementNode).setType(type); } // include element default content (if one is available) String normalizedValue = elementPSVI.getSchemaNormalizedValue(); if ((fConfiguration.features & DOMConfigurationImpl.DTNORMALIZATION) != 0) { if (normalizedValue !=null) elementNode.setTextContent(normalizedValue); } else { // NOTE: this is a hack: it is possible that DOM had an empty element // and validator sent default value using characters(), which we don't // implement. Thus, here we attempt to add the default value. String text = elementNode.getTextContent(); if (text.length() == 0) { // default content could be provided if (normalizedValue !=null) elementNode.setTextContent(normalizedValue); } } return; } } // DTD; elements have no type. if (fCurrentNode instanceof ElementNSImpl) { ((ElementNSImpl) fCurrentNode).setType(null); } } /** * The start of a CDATA section. * * @param augs Additional information that may include infoset augmentations * * @exception XNIException * Thrown by handler to signal an error. */ public void startCDATA(Augmentations augs) throws XNIException{ } /** * The end of a CDATA section. * * @param augs Additional information that may include infoset augmentations * * @exception XNIException * Thrown by handler to signal an error. */ public void endCDATA(Augmentations augs) throws XNIException{ } /** * The end of the document. * * @param augs Additional information that may include infoset augmentations * * @exception XNIException * Thrown by handler to signal an error. */ public void endDocument(Augmentations augs) throws XNIException{ } /** Sets the document source. */ public void setDocumentSource(XMLDocumentSource source){ } /** Returns the document source. */ public XMLDocumentSource getDocumentSource(){ return null; } } // DOMNormalizer class





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