http://xml.apache.org/commons/components/external/: xml-commons provides an Apache-hosted set of DOM, SAX, and JAXP interfaces for use in other xml-based projects. Our hope is that we can standardize on both a common version and packaging scheme for these critical XML standards interfaces to make the lives of both our developers and users easier. The External Components portion of xml-commons contains interfaces that are defined by external standards organizations. For DOM, that's the W3C; for SAX it's David Megginson and sax.sourceforge.net; for JAXP it's Sun. 
/*
 * 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.
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// $Id: SchemaFactoryLoader.java 448801 2006-09-22 04:19:20Z mrglavas $

package javax.xml.validation;


This class was removed from JAXP 1.3 before it was finalized but
was mistakenly included in Java 5. It only exists now for compatibility 
reasons. Applications should avoid using it.


/**
 * <p>This class was removed from JAXP 1.3 before it was finalized but
 * was mistakenly included in Java 5. It only exists now for compatibility 
 * reasons. Applications should avoid using it.</p>
 */
public abstract class SchemaFactoryLoader {
    
    protected SchemaFactoryLoader() {}
    public abstract SchemaFactory newFactory(String schemaLanguage);

} // SchemaFactoryLoader