/*
 * Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.
 */
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

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



import com.sun.org.apache.xerces.internal.impl.Constants;
import com.sun.org.apache.xerces.internal.impl.RevalidationHandler;
import com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDLoader;
import com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator;
import com.sun.org.apache.xerces.internal.impl.dv.XSSimpleType;
import com.sun.org.apache.xerces.internal.impl.xs.util.SimpleLocator;
import com.sun.org.apache.xerces.internal.util.AugmentationsImpl;
import com.sun.org.apache.xerces.internal.util.NamespaceSupport;
import com.sun.org.apache.xerces.internal.util.SymbolTable;
import com.sun.org.apache.xerces.internal.util.XML11Char;
import com.sun.org.apache.xerces.internal.util.XMLChar;
import com.sun.org.apache.xerces.internal.util.XMLSymbols;
import com.sun.org.apache.xerces.internal.xni.Augmentations;
import com.sun.org.apache.xerces.internal.xni.NamespaceContext;
import com.sun.org.apache.xerces.internal.xni.QName;
import com.sun.org.apache.xerces.internal.xni.XMLAttributes;
import com.sun.org.apache.xerces.internal.xni.XMLDocumentHandler;
import com.sun.org.apache.xerces.internal.xni.XMLLocator;
import com.sun.org.apache.xerces.internal.xni.XMLResourceIdentifier;
import com.sun.org.apache.xerces.internal.xni.XMLString;
import com.sun.org.apache.xerces.internal.xni.XNIException;
import com.sun.org.apache.xerces.internal.xni.grammars.XMLGrammarDescription;
import com.sun.org.apache.xerces.internal.xni.parser.XMLComponent;
import com.sun.org.apache.xerces.internal.xni.parser.XMLDocumentSource;
import com.sun.org.apache.xerces.internal.xs.AttributePSVI;
import com.sun.org.apache.xerces.internal.xs.ElementPSVI;
import com.sun.org.apache.xerces.internal.xs.XSTypeDefinition;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Vector;
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).
Author:
Elena Litani, IBM, Neeraj Bajaj, Sun Microsystems, inc.
@xerces.experimental
@LastModified
: Apr 2019/**
 * 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.
 * @LastModified: Apr 2019
 */
public class DOMNormalizer implements XMLDocumentHandler {

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

    
prefix added by namespace fixup algorithm should follow a pattern "NS" + index/** 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. /** Validation handler represents validator instance. */
    protected RevalidationHandler fValidationHandler;

    
symbol table /** symbol table */
    protected SymbolTable fSymbolTable;
    
error handler. may be null. /** error handler. may be null. */
    protected DOMErrorHandler fErrorHandler;

    
Cached DOMError impl. The same object is re-used to report multiple errors. /**
     * 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 /** The namespace context of this document: stores namespaces in scope */
    protected final NamespaceContext fNamespaceContext = new NamespaceSupport();

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

    
list of attributes /** list of attributes */
    protected final List<Node> fAttributeList = new ArrayList<>(5);

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

    
for setting the PSVI /** 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);

    //DTD validator
    private XMLDTDValidator fDTDValidator;

    
Empty string to pass to the validator. /** 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.
/**
     * 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 instanceof AbortException) {
                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.
Params:
node –   Modified node or null. If node is returned, we need
              to normalize again starting on the node returned.
Returns:
 the normalized Node/**
     *
     * 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) {
                        // Namespace declarations may have been added by namespace fix-up. Need
                        // to fetch the AttributeMap again if it contained no attributes prior
                        // to namespace fix-up.
                        if (attributes == null) {
                            attributes = (elem.hasAttributes()) ? (AttributeMap) elem.getAttributes() : null;
                        }
                        if (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; i<attributes.getLength(); ++i ) {
                            Attr attr = (Attr)attributes.item(i);
                            //removeDefault(attr, attributes);
                            attr.normalize();
                            if (fDocument.errorChecking && ((fConfiguration.features & DOMConfigurationImpl.WELLFORMED) != 0)){
                                    isAttrValueWF(fErrorHandler, fError, fLocator, attributes, attr, attr.getValue(), fDocument.isXML11Version());
                                if (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[]{"Attr",node.getNodeName()});
                                        reportDOMError(fErrorHandler, fError, fLocator, msg, DOMError.SEVERITY_ERROR,
                                            "wf-invalid-character-in-node-name");
                                    }
                                }
                            }
                        }
                    }
                }


                if (fValidationHandler != null) {
                    // REVISIT: possible solutions to discard default content are:
                    //         either we pass some flag to XML Schema validator
                    //         or rely on the PSVI information.
                    fAttrProxy.setAttributes(attributes, fDocument, elem);
                    updateQName(elem, fQName); // updates global qname
                    // set error node in the dom error wrapper
                    // so if error occurs we can report an error node
                    fConfiguration.fErrorHandlerWrapper.fCurrentNode = node;
                    fCurrentNode = node;
                    // call re-validation handler
                    fValidationHandler.startElement(fQName, fAttrProxy, null);
                }

                // normalize children
                Node kid, next;
                for (kid = elem.getFirstChild(); kid != null; kid = next) {
                    next = kid.getNextSibling();
                    kid = normalizeNode(kid);
                    if (kid != null) {
                        next = kid;  // don't advance
                    }
                }
                if (DEBUG_ND) {
                    // normalized subtree
                    System.out.println("***The children of {"+node.getNodeName()+"} are normalized");
                    for (kid = elem.getFirstChild(); kid != null; kid = next) {
                        next = kid.getNextSibling();
                        System.out.println(kid.getNodeName() +"["+kid.getNodeValue()+"]");
                    }

                }

                if (fValidationHandler != null) {
                    updateQName(elem, fQName); // updates global qname
                    //
                    // 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.endElement(fQName, null);
                }

                // pop namespace context
                fNamespaceContext.popContext();

                break;
            }

        case Node.COMMENT_NODE: {
                if (DEBUG_ND) {
                    System.out.println("==>normalizeNode:{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
        // <xsl:stylesheet xmlns:xsl="http://xslt">
        //   <!-- add the following via DOM
        //          body is bound to http://xslt
        //    -->
        //   <xsl:body xmlns:xsl="http://bound"/>
        //
        // ------------------------------------

        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: <xsl:stylesheet xmlns:xsl="http://xsl">
        // We create another element body bound to the "http://xsl" namespace
        // as well as namespace attribute rebounding xsl to another namespace.
        // <xsl:body xmlns:xsl="http://another">
        // 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.
Params:
prefix – 
uri – 
Throws:
IOException – /**
     * 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
Params:
datavalue – 
isXML11Version – = true if XML 1.1/**
     * 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
Params:
datavalue – 
isXML11Version – = true if XML 1.1/**
     * 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
Params:
datavalue – 
isXML11Version – = true if XML 1.1/**
     * 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 == '-' && 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");
                }
            }

        } // end-else fDocument.isXMLVersion()

    } // isCommentWF

    
NON-DOM: check if attribute value is well-formed
Params:
attributes – 
a – 
value – /** NON-DOM: check if attribute value is well-formed
     * @param attributes
     * @param a
     * @param value
     */
    public static final void isAttrValueWF(DOMErrorHandler errorHandler, DOMErrorImpl error,
            DOMLocatorImpl locator, NamedNodeMap attributes, Attr a, String value, boolean xml11Version) {
        if (a instanceof AttrImpl && ((AttrImpl)a).hasStringValue()) {
            isXMLCharWF(errorHandler, error, locator, value, xml11Version);
        } else {
                NodeList children = a.getChildNodes();
            //check each child node of the attribute's value
            for (int j = 0; j < children.getLength(); j++) {
                Node child = children.item(j);
                //If the attribute's child is an entity refernce
                if (child.getNodeType() == Node.ENTITY_REFERENCE_NODE) {
                    Document owner = a.getOwnerDocument();
                    Entity ent = null;
                    //search for the entity in the docType
                    //of the attribute's ownerDocument
                    if (owner != null) {
                        DocumentType docType = owner.getDoctype();
                        if (docType != null) {
                            NamedNodeMap entities = docType.getEntities();
                            ent = (Entity) entities.getNamedItemNS(
                                    "*",
                                    child.getNodeName());
                        }
                    }
                    //If the entity was not found issue a fatal error
                    if (ent == null) {
                        String msg = DOMMessageFormatter.formatMessage(
                            DOMMessageFormatter.DOM_DOMAIN, "UndeclaredEntRefInAttrValue",
                            new Object[]{a.getNodeName()});
                        reportDOMError(errorHandler, error, locator, msg, DOMError.SEVERITY_ERROR,
                            "UndeclaredEntRefInAttrValue");
                    }
                }
                else {
                    // Text node
                    isXMLCharWF(errorHandler, error, locator, child.getNodeValue(), xml11Version);
                }
            }
        }
    }



    
Reports a DOM error to the user handler.
If the error is fatal, the processing will be always aborted.
/**
     * Reports a DOM error to the user handler.
     *
     * If the error is fatal, the processing will be always aborted.
     */
    public static final void reportDOMError(DOMErrorHandler errorHandler, DOMErrorImpl error, DOMLocatorImpl locator,
                        String message, short severity, String type ) {
        if( errorHandler!=null ) {
            error.reset();
            error.fMessage = message;
            error.fSeverity = severity;
            error.fLocator = locator;
            error.fType = type;
            error.fRelatedData = locator.fRelatedNode;

            if(!errorHandler.handleError(error))
                throw new AbortException();
        }
        if( severity==DOMError.SEVERITY_FATAL_ERROR )
            throw new AbortException();
    }

    protected final void updateQName (Node node, QName qname){

        String prefix    = node.getPrefix();
        String namespace = node.getNamespaceURI();
        String localName = node.getLocalName();
        // REVISIT: the symbols are added too often: start/endElement
        //          and in the namespaceFixup. Should reduce number of calls to symbol table.
        qname.prefix = (prefix!=null && prefix.length()!=0)?fSymbolTable.addSymbol(prefix):null;
        qname.localpart = (localName != null)?fSymbolTable.addSymbol(localName):null;
        qname.rawname = fSymbolTable.addSymbol(node.getNodeName());
        qname.uri =  (namespace != null)?fSymbolTable.addSymbol(namespace):null;
    }



        /* REVISIT: remove this method if DOM does not change spec.
         * Performs partial XML 1.0 attribute value normalization and replaces
     * attribute value if the value is changed after the normalization.
     * DOM defines that normalizeDocument acts as if the document was going
     * through a save and load cycle, given that serializer will not escape
     * any '\n' or '\r' characters on load those will be normalized.
     * Thus during normalize document we need to do the following:
     * - perform "2.11 End-of-Line Handling"
     * - replace #xD, #xA, #x9 with #x20 (white space).
     * Note: This alg. won't attempt to resolve entity references or character entity
     * references, since '&' will be escaped during serialization and during loading
     * this won't be recognized as entity reference, i.e. attribute value "&foo;" will
     * be serialized as "&amp;foo;" and thus after loading will be "&foo;" again.
         * @param value current attribute value
         * @param attr current attribute
         * @return String the value (could be original if normalization did not change
     * the string)
         */
    final String normalizeAttributeValue(String value, Attr attr) {
        if (!attr.getSpecified()){
            // specified attributes should already have a normalized form
            // since those were added by validator
            return value;
        }
        int end = value.length();
        // ensure capacity
        if (fNormalizedValue.ch.length < end) {
            fNormalizedValue.ch = new char[end];
        }
        fNormalizedValue.length = 0;
        boolean normalized = false;
        for (int i = 0; i < end; i++) {
            char c = value.charAt(i);
            if (c==0x0009 || c==0x000A) {
               fNormalizedValue.ch[fNormalizedValue.length++] = ' ';
               normalized = true;
            }
            else if(c==0x000D){
               normalized = true;
               fNormalizedValue.ch[fNormalizedValue.length++] = ' ';
               int next = i+1;
               if (next < end && value.charAt(next)==0x000A) i=next; // skip following xA
            }
            else {
                fNormalizedValue.ch[fNormalizedValue.length++] = c;
            }
        }
        if (normalized){
           value = fNormalizedValue.toString();
           attr.setValue(value);
        }
        return value;
    }

    protected final class XMLAttributesProxy
    implements XMLAttributes {
        protected AttributeMap fAttributes;
        protected CoreDocumentImpl fDocument;
        protected ElementImpl fElement;

        protected Vector<String> fDTDTypes = new Vector<>(5);
        protected Vector<Augmentations> fAugmentations = new Vector<>(5);

        public void setAttributes(AttributeMap attributes, CoreDocumentImpl doc, ElementImpl elem) {
            fDocument = doc;
            fAttributes = attributes;
            fElement = elem;
            if (attributes != null) {
                int length = attributes.getLength();
                fDTDTypes.setSize(length);
                fAugmentations.setSize(length);
                // REVISIT: this implementation does not store any value in augmentations
                //          and basically not keeping augs in parallel to attributes map
                //          untill all attributes are added (default attributes)
                for (int i = 0; i < length; i++) {
                    fAugmentations.setElementAt(new AugmentationsImpl(), i);
                }
            }
            else {
                fDTDTypes.setSize(0);
                fAugmentations.setSize(0);
            }
        }


        
This method adds default declarations
See Also:
addAttribute.addAttribute(QName, String, String)/**
         * This method adds default declarations
                 * @see com.sun.org.apache.xerces.internal.xni.XMLAttributes#addAttribute(QName, String, String)
         */
        public int addAttribute(QName qname, String attrType, String attrValue) {
            int index = fElement.getXercesAttribute(qname.uri, qname.localpart);
            // add defaults to the tree
            if (index < 0) {
                // the default attribute was removed by a user and needed to
                // be added back
                AttrImpl attr = (AttrImpl)
                    ((CoreDocumentImpl) fElement.getOwnerDocument()).createAttributeNS(
                        qname.uri,
                        qname.rawname,
                        qname.localpart);
                // REVISIT: the following should also update ID table
                attr.setNodeValue(attrValue);
                index = fElement.setXercesAttributeNode(attr);
                fDTDTypes.insertElementAt(attrType, index);
                fAugmentations.insertElementAt(new AugmentationsImpl(), index);
                attr.setSpecified(false);
            }
            else {
                // default attribute is in the tree
                // we don't need to do anything since prefix was already fixed
                // at the namespace fixup time and value must be same value, otherwise
                // attribute will be treated as specified and we will never reach
                // this method.

            }
            return index;
        }


        public void removeAllAttributes(){
            // REVISIT: implement
        }


        public void removeAttributeAt(int attrIndex){
            // REVISIT: implement
        }


        public int getLength(){
            return(fAttributes != null)?fAttributes.getLength():0;
        }


        public int getIndex(String qName){
            // REVISIT: implement
            return -1;
        }

        public int getIndex(String uri, String localPart) {
            // REVISIT: implement
            return -1;
        }

        public void setName(int attrIndex, QName attrName) {
            // REVISIT: implement
        }

        public void getName(int attrIndex, QName attrName) {
            if (fAttributes != null) {
                updateQName((Node)fAttributes.getItem(attrIndex), attrName);
            }
        }

        public String getPrefix(int index) {
            if (fAttributes != null) {
                Node node = (Node) fAttributes.getItem(index);
                String prefix = node.getPrefix();
                prefix = (prefix != null && prefix.length() != 0) ? fSymbolTable.addSymbol(prefix) : null;
                return prefix;
            }
            return null;
        }

        public String getURI(int index) {
            if (fAttributes != null) {
                Node node = (Node) fAttributes.getItem(index);
                String namespace = node.getNamespaceURI();
                namespace = (namespace != null) ? fSymbolTable.addSymbol(namespace) : null;
                return namespace;
            }
            return null;
        }


        public String getLocalName(int index) {
            if (fAttributes != null) {
                Node node = (Node) fAttributes.getItem(index);
                String localName = node.getLocalName();
                localName = (localName != null) ? fSymbolTable.addSymbol(localName) : null;
                return localName;
            }
            return null;
        }

        public String getQName(int index) {
            if (fAttributes != null) {
                Node node = (Node) fAttributes.getItem(index);
                String rawname = fSymbolTable.addSymbol(node.getNodeName());
                return rawname;
            }
            return null;
        }

         public QName getQualifiedName(int index){
            //return fAttributes.item(index).ge);
            return null;
        }

        public void setType(int attrIndex, String attrType) {
            fDTDTypes.setElementAt(attrType, attrIndex);
        }

        public String getType(int index) {
            String type = fDTDTypes.elementAt(index);
            return (type != null) ? getReportableType(type) : "CDATA";
        }

        public String getType(String qName) {
            return "CDATA";
        }

        public String getType(String uri, String localName) {
            return "CDATA";
        }

        private String getReportableType(String type) {
            if (type.charAt(0) == '(') {
                return "NMTOKEN";
            }
            return type;
        }

        public void setValue(int attrIndex, String attrValue) {
            // REVISIT: is this desired behaviour?
            // The values are updated in the case datatype-normalization is turned on
            // in this case we need to make sure that specified attributes stay specified

            if (fAttributes != null){
                AttrImpl attr = (AttrImpl)fAttributes.getItem(attrIndex);
                boolean specified = attr.getSpecified();
                attr.setValue(attrValue);
                attr.setSpecified(specified);

            }
        }

        public  void setValue(int attrIndex, String attrValue, XMLString value){
            setValue(attrIndex, value.toString());
        }

        public String getValue(int index){
            return (fAttributes !=null)?fAttributes.item(index).getNodeValue():"";

        }

        public String getValue(String qName){
            // REVISIT: implement
            return null;
        }

        public String getValue(String uri, String localName){
            if (fAttributes != null) {
                Node node =  fAttributes.getNamedItemNS(uri, localName);
                return(node != null)? node.getNodeValue():null;
            }
            return null;
        }

        public void setNonNormalizedValue(int attrIndex, String attrValue){
            // REVISIT: implement

        }

        public String getNonNormalizedValue(int attrIndex){
            // REVISIT: implement
            return null;
        }

        public void setSpecified(int attrIndex, boolean specified){
            AttrImpl attr = (AttrImpl)fAttributes.getItem(attrIndex);
            attr.setSpecified(specified);
        }

        public boolean isSpecified(int attrIndex){
            return((Attr)fAttributes.getItem(attrIndex)).getSpecified();
        }

        public Augmentations getAugmentations (int attributeIndex){
            return fAugmentations.elementAt(attributeIndex);
        }

        public Augmentations getAugmentations (String uri, String localPart){
            // REVISIT: implement
            return null;
        }

        public Augmentations getAugmentations(String qName){
            // REVISIT: implement
            return null;
        }

        
Sets the augmentations of the attribute at the specified index.
Params:
attrIndex – The attribute index.
augs –      The augmentations./**
         * Sets the augmentations of the attribute at the specified index.
         *
         * @param attrIndex The attribute index.
         * @param augs      The augmentations.
         */
        public void setAugmentations(int attrIndex, Augmentations augs) {
            fAugmentations.setElementAt(augs, attrIndex);
        }
    }

    //
    // XMLDocumentHandler methods
    //

    
The start of the document.
Params:
locator –  The document locator, or null if the document
                location cannot be reported during the parsing
                of this document. However, it is strongly
                recommended that a locator be supplied that can
                at least report the system identifier of the
                document.
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).
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.
augs –     Additional information that may include infoset augmentations
Throws:
XNIException – 
                  Thrown by handler to signal an error./**
     * The start of the document.
     *
     * @param locator  The document locator, or null if the document
     *                 location cannot be reported during the parsing
     *                 of this document. However, it is <em>strongly</em>
     *                 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.
Params:
version –    The XML version.
encoding –   The IANA encoding name of the document, or null if
                  not specified.
standalone – The standalone value, or null if not specified.
augs –       Additional information that may include infoset augmentations
Throws:
XNIException – 
                  Thrown by handler to signal an error./**
     * 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.
Params:
rootElement – 
                The name of the root element.
publicId – The public identifier if an external DTD or null
                if the external DTD is specified using SYSTEM.
systemId – The system identifier if an external DTD, null
                otherwise.
augs –     Additional information that may include infoset augmentations
Throws:
XNIException – 
                  Thrown by handler to signal an error./**
     * 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.
Params:
text –   The text in the comment.
augs –   Additional information that may include infoset augmentations
Throws:
XNIException – 
                  Thrown by application to signal an error./**
     * 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.
Params:
target – The target.
data –   The data or null if none specified.
augs –   Additional information that may include infoset augmentations
Throws:
XNIException – 
                  Thrown by handler to signal an error./**
     * A processing instruction. Processing instructions consist of a
     * target name and, optionally, text data. The data is only meaningful
     * to the application.
     * <p>
     * Typically, a processing instruction's data will contain a series
     * of pseudo-attributes. These pseudo-attributes follow the form of
     * element attributes but are <strong>not</strong> 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.
Params:
element –    The name of the element.
attributes – The element attributes.
augs –       Additional information that may include infoset augmentations
Throws:
XNIException – 
                  Thrown by handler to signal an error./**
     * 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.getSchemaValue().getNormalizedValue();
                    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.
Params:
element –    The name of the element.
attributes – The element attributes.
augs –       Additional information that may include infoset augmentations
Throws:
XNIException – 
                  Thrown by handler to signal an error./**
     * 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.
Params:
name –     The name of the general entity.
identifier – The resource identifier.
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).
augs –     Additional information that may include infoset augmentations
Throws:
XNIException – Thrown by handler to signal an error./**
     * This method notifies the start of a general entity.
     * <p>
     * <strong>Note:</strong> 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.
Params:
version –  The XML version, or null if not specified.
encoding – The IANA encoding name of the entity.
augs –     Additional information that may include infoset augmentations
Throws:
XNIException – 
                  Thrown by handler to signal an error./**
     * Notifies of the presence of a TextDecl line in an entity. If present,
     * this method will be called immediately following the startEntity call.
     * <p>
     * <strong>Note:</strong> This method will never be called for the
     * document entity; it is only called for external general entities
     * referenced in document content.
     * <p>
     * <strong>Note:</strong> 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.
Params:
name –   The name of the entity.
augs –   Additional information that may include infoset augmentations
Throws:
XNIException – 
                  Thrown by handler to signal an error./**
     * This method notifies the end of a general entity.
     * <p>
     * <strong>Note:</strong> 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.
Params:
text –   The content.
augs –   Additional information that may include infoset augmentations
Throws:
XNIException – 
                  Thrown by handler to signal an error./**
     * 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.
Params:
text –   The ignorable whitespace.
augs –   Additional information that may include infoset augmentations
Throws:
XNIException – 
                  Thrown by handler to signal an error./**
     * 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.
Params:
element – The name of the element.
augs –    Additional information that may include infoset augmentations
Throws:
XNIException – 
                  Thrown by handler to signal an error./**
     * 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.getSchemaValue().getNormalizedValue();
                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.
Params:
augs –   Additional information that may include infoset augmentations
Throws:
XNIException – 
                  Thrown by handler to signal an error./**
     * 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.
Params:
augs –   Additional information that may include infoset augmentations
Throws:
XNIException – 
                  Thrown by handler to signal an error./**
     * 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.
Params:
augs –   Additional information that may include infoset augmentations
Throws:
XNIException – 
                  Thrown by handler to signal an error./**
     * 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. /** Sets the document source. */
    public void setDocumentSource(XMLDocumentSource source){
    }


    
Returns the document source. /** Returns the document source. */
    public XMLDocumentSource getDocumentSource(){
        return null;
    }

}  // DOMNormalizer class