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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.jaxp.validation;

import org.apache.xerces.xni.grammars.Grammar;
import org.apache.xerces.xni.grammars.XMLGrammarDescription;
import org.apache.xerces.xni.grammars.XMLGrammarPool;

/**
 * Implementation of Schema for W3C XML Schemas which 
 * contains schema components from one target namespace.
 * 
 * @author Michael Glavassevich, IBM
 * @version $Id: SimpleXMLSchema.java 542516 2007-05-29 13:44:47Z mrglavas $
 */
final class SimpleXMLSchema extends AbstractXMLSchema implements XMLGrammarPool {
    
    /** Zero length grammar array. */
    private static final Grammar [] ZERO_LENGTH_GRAMMAR_ARRAY = new Grammar [0];

    private final Grammar fGrammar;
    private final Grammar[] fGrammars;
    private final XMLGrammarDescription fGrammarDescription;
    
    public SimpleXMLSchema(Grammar grammar) {
        fGrammar = grammar;
        fGrammars = new Grammar[] {grammar};
        fGrammarDescription = grammar.getGrammarDescription();
    }
    
    /*
     * XMLGrammarPool methods
     */

    public Grammar[] retrieveInitialGrammarSet(String grammarType) {
        return XMLGrammarDescription.XML_SCHEMA.equals(grammarType) ? 
                (Grammar[]) fGrammars.clone() : ZERO_LENGTH_GRAMMAR_ARRAY;
    }

    public void cacheGrammars(String grammarType, Grammar[] grammars) {}

    public Grammar retrieveGrammar(XMLGrammarDescription desc) {
        return fGrammarDescription.equals(desc) ? fGrammar : null;
    }

    public void lockPool() {}

    public void unlockPool() {}

    public void clear() {}
    
    /*
     * XSGrammarPoolContainer methods
     */

    public XMLGrammarPool getGrammarPool() {
        return this;
    }

    public boolean isFullyComposed() {
        return true;
    }

} // SimpleXMLSchema