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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.

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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.
 */
// $Id: XPathFunctionResolver.java 446598 2006-09-15 12:55:40Z jeremias $

package javax.xml.xpath;

import javax.xml.namespace.QName;

/**
 * XPathFunctionResolver provides access to the set of user defined XPathFunctions.
 *
 * XPath functions are resolved by name and arity.
 * The resolver is not needed for XPath built-in functions and the resolver
 * cannot be used to override those functions.
 *
 * In particular, the resolver is only called for functions in an another
 * namespace (functions with an explicit prefix). This means that you cannot
 * use the XPathFunctionResolver to implement specifications
 * like XML-Signature Syntax
 * and Processing which extend the function library of XPath 1.0 in the
 * same namespace. This is a consequence of the design of the resolver.
 *
 * If you wish to implement additional built-in functions, you will have to
 * extend the underlying implementation directly.
 *
 * @author  Norman Walsh
 * @author  Jeff Suttor
 * @version $Revision: 446598 $, $Date: 2006-09-15 08:55:40 -0400 (Fri, 15 Sep 2006) $
 * @see XML Path Language (XPath) Version 1.0, Core Function Library
 * @since 1.5
 */
public interface XPathFunctionResolver {
  /** 
   * Find a function in the set of available functions.
   * 
   * If functionName or arity is null, then a NullPointerException is thrown.
   *
   * @param functionName The function name.
   * @param arity The number of arguments that the returned function must accept.
   * 
   * @return The function or null if no function named functionName with arity arguments exists.
   * 
   * @throws NullPointerException If functionName or arity is null.
   */
  public XPathFunction resolveFunction(QName functionName, int arity);
}