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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.
 */

package org.apache.xerces.xpointer;

import org.apache.xerces.xni.Augmentations;
import org.apache.xerces.xni.QName;
import org.apache.xerces.xni.XMLAttributes;
import org.apache.xerces.xni.XNIException;

/**
 * 
 * The XPointerProcessor is responsible for parsing an XPointer 
 * expression and and providing scheme specific resolution of 
 * the document fragment pointed to be the pointer.
 * 
 *
 * @xerces.internal
 *
 * @version $Id: XPointerProcessor.java 603808 2007-12-13 03:44:48Z mrglavas $
 */
public interface XPointerProcessor {

    // The start element event
    public static final int EVENT_ELEMENT_START = 0;

    // The end element event
    public static final int EVENT_ELEMENT_END = 1;

    // The empty element event    
    public static final int EVENT_ELEMENT_EMPTY = 2;

    /**
     * Parses an XPointer expression.  It performs scheme specific processing
     * depending on the pointer parts and sets up a Vector of XPointerParts 
     * in the order (left-to-right) they appear in the XPointer expression.    
     * 
     * @param  xpointer A String representing the xpointer expression.
     * @throws XNIException Thrown if the xpointer string does not conform to 
     *         the XPointer Framework syntax or the syntax of the pointer part does
     *         not conform to its definition for its scheme. 
     */
    public void parseXPointer(String xpointer) throws XNIException;

    /**
     * Evaluates an XML resource with respect to an XPointer expressions   
     * by checking if it's element and attributes parameters match the 
     * criteria specified in the xpointer expression.  
     * 
     * @param element - The name of the element.
     * @param attributes - The element attributes.
     * @param augs - Additional information that may include infoset augmentations
     * @param event - An integer indicating
     *                0 - The start of an element
     *                1 - The end of an element
     *                2 - An empty element call
     * @return true if the element was resolved by the xpointer 
     * @throws XNIException Thrown to signal an error
     */
    public boolean resolveXPointer(QName element, XMLAttributes attributes,
            Augmentations augs, int event) throws XNIException;

    /**
     * Returns true if the XPointer expression resolves to the current resource fragment
     * or Node which is part of the input resource being streamed else returns false.       
     * 
     * @return True if the xpointer expression matches a node/fragment in the resource
     *         else returns false. 
     * @throws XNIException Thrown to signal an error
     */
    public boolean isFragmentResolved() throws XNIException;

    /**
     * Returns true if the XPointer expression resolves any subresource of the
     * input resource.       
     * 
     * @return True if the xpointer expression matches a fragment in the resource
     *         else returns false. 
     * @throws XNIException Thrown to signal an error 
     */
    public boolean isXPointerResolved() throws XNIException;
    
}