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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.xerces.dom;

import java.util.ArrayList;

import org.apache.xerces.impl.xs.XSImplementationImpl;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.DOMImplementationList;

/**
 * Allows to retrieve XSImplementation, DOM Level 3 Core and LS implementations
 * and PSVI implementation.
 * See also the Document Object Model (DOM) Level 3 Core Specification.
 * 
 * @xerces.internal
 * 
 * @author Elena Litani, IBM
 * @version $Id: DOMXSImplementationSourceImpl.java 603686 2007-12-12 17:51:23Z mrglavas $
 */
public class DOMXSImplementationSourceImpl
    extends DOMImplementationSourceImpl {
    
    /**
     * A method to request a DOM implementation.
     * @param features A string that specifies which features are required. 
     *   This is a space separated list in which each feature is specified 
     *   by its name optionally followed by a space and a version number. 
     *   This is something like: "XML 1.0 Traversal Events 2.0"
     * @return An implementation that has the desired features, or 
     *   null if this source has none.
     */
    public DOMImplementation getDOMImplementation(String features) {
        DOMImplementation impl = super.getDOMImplementation(features);
        if (impl != null){
            return impl;
        }
        // if not try the PSVIDOMImplementation
        impl = PSVIDOMImplementationImpl.getDOMImplementation();
        if (testImpl(impl, features)) {
            return impl;
        }
        // if not try the XSImplementation
        impl = XSImplementationImpl.getDOMImplementation();
        if (testImpl(impl, features)) {
            return impl;
        }
        
        return null;
    }
    
    /**
     * A method to request a list of DOM implementations that support the 
     * specified features and versions, as specified in .
     * @param features A string that specifies which features and versions 
     *   are required. This is a space separated list in which each feature 
     *   is specified by its name optionally followed by a space and a 
     *   version number. This is something like: "XML 3.0 Traversal +Events 
     *   2.0"
     * @return A list of DOM implementations that support the desired 
     *   features.
     */
    public DOMImplementationList getDOMImplementationList(String features) {
        final ArrayList implementations = new ArrayList();

        // first check whether the CoreDOMImplementation would do
        DOMImplementationList list = super.getDOMImplementationList(features);
        // Add core DOMImplementations
        for (int i = 0; i < list.getLength(); ++i) {
            implementations.add(list.item(i));
        }

        DOMImplementation impl = PSVIDOMImplementationImpl.getDOMImplementation();
        if (testImpl(impl, features)) {
            implementations.add(impl);
        }

        impl = XSImplementationImpl.getDOMImplementation();
        if (testImpl(impl, features)) {
            implementations.add(impl);
        }
        return new DOMImplementationListImpl(implementations); 
    }
}