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A slightly adapted version of Xerces 2.11.0 to allow the XMLStringBuffer responsible for XML attribute scanning to start larger and thus avoid extended appending times. The initial buffer size is controlled by settting the system property julielab.xerces.attributebuffersize (also available as constant XMLScanner#ATTRIBUTE_BUFFER_SIZE).
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.wml.dom;

import java.lang.reflect.Constructor;
import java.util.Hashtable;

import org.apache.wml.WMLDocument;
import org.apache.xerces.dom.DocumentImpl;
import org.apache.xerces.dom.ElementImpl;
import org.w3c.dom.DOMException;
import org.w3c.dom.DocumentType;
import org.w3c.dom.Element;

/**
 * @xerces.internal
 * @version $Id: WMLDocumentImpl.java 890457 2009-12-14 19:47:46Z mrglavas $
 * @author David Li
 */
public class WMLDocumentImpl extends DocumentImpl implements WMLDocument {
    
    private static final long serialVersionUID = -6582904849512384104L;
    
    private static Hashtable        _elementTypesWML;
    private static final Class[]    _elemClassSigWML =
        new Class[] { WMLDocumentImpl.class, String.class };
    
    public Element createElement( String tagName ) throws DOMException
    {
        Class        elemClass;
        Constructor    cnst;
        
        elemClass = (Class) _elementTypesWML.get( tagName );
        if ( elemClass != null ) {
            try	{
                cnst = elemClass.getConstructor( _elemClassSigWML );
                return (Element) cnst.newInstance( new Object[] { this, tagName } );
            } catch ( Exception except ) {
                Throwable thrw;
                
                if ( except instanceof java.lang.reflect.InvocationTargetException )
                    thrw = ( (java.lang.reflect.InvocationTargetException) except ).getTargetException();
                else
                    thrw = except;
                
                System.out.println( "Exception " + thrw.getClass().getName() );
                System.out.println( thrw.getMessage() );
                
                throw new IllegalStateException( "Tag '" + tagName + "' associated with an Element class that failed to construct." );
            }
        }
        return new WMLElementImpl( this, tagName );
    }
    
    /* (non-Javadoc)
     * @see CoreDocumentImpl#canRenameElements()
     */
    protected boolean canRenameElements(String newNamespaceURI, String newNodeName, ElementImpl el) {
        // check whether a class change is required
        return _elementTypesWML.get(newNodeName) == _elementTypesWML.get(el.getTagName());
    }
    
    static {
        _elementTypesWML = new Hashtable();
        _elementTypesWML.put("b", WMLBElementImpl.class);
        _elementTypesWML.put("noop", WMLNoopElementImpl.class);
        _elementTypesWML.put("a", WMLAElementImpl.class);
        _elementTypesWML.put("setvar", WMLSetvarElementImpl.class);
        _elementTypesWML.put("access", WMLAccessElementImpl.class);
        _elementTypesWML.put("strong", WMLStrongElementImpl.class);
        _elementTypesWML.put("postfield", WMLPostfieldElementImpl.class);
        _elementTypesWML.put("do", WMLDoElementImpl.class);
        _elementTypesWML.put("wml", WMLWmlElementImpl.class);
        _elementTypesWML.put("tr", WMLTrElementImpl.class);
        _elementTypesWML.put("go", WMLGoElementImpl.class);
        _elementTypesWML.put("big", WMLBigElementImpl.class);
        _elementTypesWML.put("anchor", WMLAnchorElementImpl.class);
        _elementTypesWML.put("timer", WMLTimerElementImpl.class);
        _elementTypesWML.put("small", WMLSmallElementImpl.class);
        _elementTypesWML.put("optgroup", WMLOptgroupElementImpl.class);
        _elementTypesWML.put("head", WMLHeadElementImpl.class);
        _elementTypesWML.put("td", WMLTdElementImpl.class);
        _elementTypesWML.put("fieldset", WMLFieldsetElementImpl.class);
        _elementTypesWML.put("img", WMLImgElementImpl.class);
        _elementTypesWML.put("refresh", WMLRefreshElementImpl.class);
        _elementTypesWML.put("onevent", WMLOneventElementImpl.class);
        _elementTypesWML.put("input", WMLInputElementImpl.class);
        _elementTypesWML.put("prev", WMLPrevElementImpl.class);
        _elementTypesWML.put("table", WMLTableElementImpl.class);
        _elementTypesWML.put("meta", WMLMetaElementImpl.class);
        _elementTypesWML.put("template", WMLTemplateElementImpl.class);
        _elementTypesWML.put("br", WMLBrElementImpl.class);
        _elementTypesWML.put("option", WMLOptionElementImpl.class);
        _elementTypesWML.put("u", WMLUElementImpl.class);
        _elementTypesWML.put("p", WMLPElementImpl.class);
        _elementTypesWML.put("select", WMLSelectElementImpl.class);
        _elementTypesWML.put("em", WMLEmElementImpl.class);
        _elementTypesWML.put("i", WMLIElementImpl.class);
        _elementTypesWML.put("card", WMLCardElementImpl.class);       
    }
    
    /* DOM level 2 */
    public WMLDocumentImpl(DocumentType doctype) {
        super(doctype, false);
    }
}