https://xerces.apache.org/xerces2-j/: Xerces2 is the next generation of high performance, fully compliant XML parsers in the Apache Xerces family. This new version of Xerces introduces the Xerces Native Interface (XNI), a complete framework for building parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is the reference implementation of XNI but other parser components, configurations, and parsers can be written using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual. Xerces2 is a fully conforming XML Schema 1.0 processor. A partial experimental implementation of the XML Schema 1.1 Structures and Datatypes Working Drafts (December 2009) and an experimental implementation of the XML Schema Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010) are provided for evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that it does not yet provide an option to enable normalization checking as described in section 2.13 of this specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use. 
/*
 * 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
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package org.apache.xerces.xni.grammars;


A generic grammar for use in validating XML documents. The Grammar
object stores the validation information in a compiled form. Specific
subclasses extend this class and "populate" the grammar by compiling 
the specific syntax (DTD, Schema, etc) into the data structures used
by this object.


Note: The Grammar object is not useful as a generic 
grammar access or query object. In other words, you cannot round-trip 
specific grammar syntaxes with the compiled grammar information in 
the Grammar object. You can create equivalent validation
rules in your choice of grammar syntax but there is no guarantee that
the input and output will be the same.

 Right now, this class is largely a shell; eventually, 
it will be enriched by having more expressive methods added. 

will be moved from dtd.Grammar here.

Author:Jeffrey Rodriguez, IBM, Eric Ye, IBM, Andy Clark, IBM, Neil Graham, IBM
Version:$Id: Grammar.java 447245 2006-09-18 05:22:10Z mrglavas $
/**
 * A generic grammar for use in validating XML documents. The Grammar
 * object stores the validation information in a compiled form. Specific
 * subclasses extend this class and "populate" the grammar by compiling 
 * the specific syntax (DTD, Schema, etc) into the data structures used
 * by this object.
 * <p>
 * <strong>Note:</strong> The Grammar object is not useful as a generic 
 * grammar access or query object. In other words, you cannot round-trip 
 * specific grammar syntaxes with the compiled grammar information in 
 * the Grammar object. You <em>can</em> create equivalent validation
 * rules in your choice of grammar syntax but there is no guarantee that
 * the input and output will be the same.
 * 
 * <p> Right now, this class is largely a shell; eventually, 
 * it will be enriched by having more expressive methods added. </p>
 * will be moved from dtd.Grammar here.
 *
 * @author Jeffrey Rodriguez, IBM
 * @author Eric Ye, IBM
 * @author Andy Clark, IBM
 * @author Neil Graham, IBM
 *
 * @version $Id: Grammar.java 447245 2006-09-18 05:22:10Z mrglavas $
 */

public interface Grammar {

    
get the XMLGrammarDescription associated with this
object

/**
     * get the <code>XMLGrammarDescription</code> associated with this
     * object
     */
    public XMLGrammarDescription getGrammarDescription ();
} // interface Grammar