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
 * limitations under the License.
 */

package org.apache.xerces.xni;


This handler interface contains methods necessary to receive
information about document elements and content.


Note: Some of these methods overlap methods
found in the XMLDocumentHandler interface.

Author:Andy Clark, IBM
See Also:
  • XMLDocumentHandler
Version:$Id: XMLDocumentFragmentHandler.java 447247 2006-09-18 05:23:52Z mrglavas $
/**
 * This handler interface contains methods necessary to receive
 * information about document elements and content.
 * <p>
 * <strong>Note:</strong> Some of these methods overlap methods
 * found in the XMLDocumentHandler interface.
 *
 * @see XMLDocumentHandler
 *
 * @author Andy Clark, IBM
 * @version $Id: XMLDocumentFragmentHandler.java 447247 2006-09-18 05:23:52Z mrglavas $
 */
public interface XMLDocumentFragmentHandler {

    //
    // XMLDocumentFragmentHandler methods
    //

    
The start of the document fragment.

Params:
  • locator –          The document locator, or null if the
                        document location cannot be reported
                        during the parsing of this fragment.
                        However, it is strongly
                        recommended that a locator be supplied
                        that can at least report the base
                        system identifier.
  • namespaceContext – The namespace context in effect at the
                        start of this document fragment. This
                        object only represents the current context.
                        Implementors of this class are responsible
                        for copying the namespace bindings from the
                        the current context (and its parent contexts)
                        if that information is important.
  • augmentations –    Additional information that may include infoset
                        augmentations.
Throws:
/**
     * The start of the document fragment.
     *
     * @param locator          The document locator, or null if the
     *                         document location cannot be reported
     *                         during the parsing of this fragment.
     *                         However, it is <em>strongly</em>
     *                         recommended that a locator be supplied
     *                         that can at least report the base
     *                         system identifier.
     * @param namespaceContext The namespace context in effect at the
     *                         start of this document fragment. This
     *                         object only represents the current context.
     *                         Implementors of this class are responsible
     *                         for copying the namespace bindings from the
     *                         the current context (and its parent contexts)
     *                         if that information is important.
     * @param augmentations    Additional information that may include infoset
     *                         augmentations.
     *
     * @throws XNIException Thrown by handler to signal an error.
     */
    public void startDocumentFragment(XMLLocator locator,
                                      NamespaceContext namespaceContext,
                                      Augmentations augmentations) 
        throws XNIException;

    
This method notifies the start of a general entity.


Note: This method is not called for entity references
appearing as part of attribute values.

Params:
  • name –     The name of the general entity.
  • identifier – The resource identifier.
  • encoding – The auto-detected IANA encoding name of the entity
                stream. This value will be null in those situations
                where the entity encoding is not auto-detected (e.g.
                internal entities or a document entity that is
                parsed from a java.io.Reader).
  • augmentations – Additional information that may include infoset
                     augmentations.
Throws:
/**
     * This method notifies the start of a general entity.
     * <p>
     * <strong>Note:</strong> This method is not called for entity references
     * appearing as part of attribute values.
     * 
     * @param name     The name of the general entity.
     * @param identifier The resource identifier.
     * @param encoding The auto-detected IANA encoding name of the entity
     *                 stream. This value will be null in those situations
     *                 where the entity encoding is not auto-detected (e.g.
     *                 internal entities or a document entity that is
     *                 parsed from a java.io.Reader).
     * @param augmentations Additional information that may include infoset
     *                      augmentations.
     *
     * @throws XNIException Thrown by handler to signal an error.
     */
    public void startGeneralEntity(String name, 
                                   XMLResourceIdentifier identifier,
                                   String encoding,
                                   Augmentations augmentations) throws XNIException;

    
Notifies of the presence of a TextDecl line in an entity. If present,
this method will be called immediately following the startEntity call.


Note: This method will never be called for the
document entity; it is only called for external general entities
referenced in document content.


Note: This method is not called for entity references
appearing as part of attribute values.

Params:
  • version –  The XML version, or null if not specified.
  • encoding – The IANA encoding name of the entity.
  • augmentations – Additional information that may include infoset
                     augmentations.
Throws:
/**
     * Notifies of the presence of a TextDecl line in an entity. If present,
     * this method will be called immediately following the startEntity call.
     * <p>
     * <strong>Note:</strong> This method will never be called for the
     * document entity; it is only called for external general entities
     * referenced in document content.
     * <p>
     * <strong>Note:</strong> This method is not called for entity references
     * appearing as part of attribute values.
     * 
     * @param version  The XML version, or null if not specified.
     * @param encoding The IANA encoding name of the entity.
     * @param augmentations Additional information that may include infoset
     *                      augmentations.
     *
     * @throws XNIException Thrown by handler to signal an error.
     */
    public void textDecl(String version, String encoding,
                         Augmentations augmentations) throws XNIException;

    
This method notifies the end of a general entity.


Note: This method is not called for entity references
appearing as part of attribute values.

Params:
  • name – The name of the general entity.
  • augmentations – Additional information that may include infoset
                     augmentations.
Throws:
/**
     * This method notifies the end of a general entity.
     * <p>
     * <strong>Note:</strong> This method is not called for entity references
     * appearing as part of attribute values.
     * 
     * @param name The name of the general entity.
     * @param augmentations Additional information that may include infoset
     *                      augmentations.
     *
     * @throws XNIException Thrown by handler to signal an error.
     */
    public void endGeneralEntity(String name, Augmentations augmentations) 
        throws XNIException;

    
A comment.

Params:
  • text – The text in the comment.
  • augmentations – Additional information that may include infoset
                     augmentations.
Throws:
/**
     * A comment.
     * 
     * @param text The text in the comment.
     * @param augmentations Additional information that may include infoset
     *                      augmentations.
     *
     * @throws XNIException Thrown by application to signal an error.
     */
    public void comment(XMLString text, Augmentations augmentations) 
        throws XNIException;

    
A processing instruction. Processing instructions consist of a
target name and, optionally, text data. The data is only meaningful
to the application.


Typically, a processing instruction's data will contain a series
of pseudo-attributes. These pseudo-attributes follow the form of
element attributes but are not parsed or presented
to the application as anything other than text. The application is
responsible for parsing the data.

Params:
  • target – The target.
  • data –   The data or null if none specified.
  • augmentations – Additional information that may include infoset
                     augmentations.
Throws:
/**
     * A processing instruction. Processing instructions consist of a
     * target name and, optionally, text data. The data is only meaningful
     * to the application.
     * <p>
     * Typically, a processing instruction's data will contain a series
     * of pseudo-attributes. These pseudo-attributes follow the form of
     * element attributes but are <strong>not</strong> parsed or presented
     * to the application as anything other than text. The application is
     * responsible for parsing the data.
     * 
     * @param target The target.
     * @param data   The data or null if none specified.
     * @param augmentations Additional information that may include infoset
     *                      augmentations.
     *
     * @throws XNIException Thrown by handler to signal an error.
     */
    public void processingInstruction(String target, XMLString data,
                                      Augmentations augmentations)
        throws XNIException;

    
The start of an element.

Params:
  • element –    The name of the element.
  • attributes – The element attributes.
  • augmentations – Additional information that may include infoset
                     augmentations.
Throws:
/**
     * The start of an element.
     * 
     * @param element    The name of the element.
     * @param attributes The element attributes.
     * @param augmentations Additional information that may include infoset
     *                      augmentations.
     *
     * @throws XNIException Thrown by handler to signal an error.
     */
    public void startElement(QName element, XMLAttributes attributes,
                             Augmentations augmentations) throws XNIException;

    
An empty element.

Params:
  • element –    The name of the element.
  • attributes – The element attributes.
  • augmentations – Additional information that may include infoset
                     augmentations.
Throws:
/**
     * An empty element.
     * 
     * @param element    The name of the element.
     * @param attributes The element attributes.
     * @param augmentations Additional information that may include infoset
     *                      augmentations.
     *
     * @throws XNIException Thrown by handler to signal an error.
     */
    public void emptyElement(QName element, XMLAttributes attributes,
                             Augmentations augmentations) throws XNIException;

    
Character content.

Params:
  • text – The content.
  • augmentations – Additional information that may include infoset
                     augmentations.
Throws:
/**
     * Character content.
     * 
     * @param text The content.
     * @param augmentations Additional information that may include infoset
     *                      augmentations.
     *
     * @throws XNIException Thrown by handler to signal an error.
     */
    public void characters(XMLString text, Augmentations augmentations) 
        throws XNIException;

    
Ignorable whitespace. For this method to be called, the document
source must have some way of determining that the text containing
only whitespace characters should be considered ignorable. For
example, the validator can determine if a length of whitespace
characters in the document are ignorable based on the element
content model.

Params:
  • text – The ignorable whitespace.
  • augmentations – Additional information that may include infoset
                     augmentations.
Throws:
/**
     * Ignorable whitespace. For this method to be called, the document
     * source must have some way of determining that the text containing
     * only whitespace characters should be considered ignorable. For
     * example, the validator can determine if a length of whitespace
     * characters in the document are ignorable based on the element
     * content model.
     * 
     * @param text The ignorable whitespace.
     * @param augmentations Additional information that may include infoset
     *                      augmentations.
     *
     * @throws XNIException Thrown by handler to signal an error.
     */
    public void ignorableWhitespace(XMLString text,
                                    Augmentations augmentations) 
        throws XNIException;

    
The end of an element.

Params:
  • element – The name of the element.
  • augmentations – Additional information that may include infoset
                     augmentations.
Throws:
/**
     * The end of an element.
     * 
     * @param element The name of the element.
     * @param augmentations Additional information that may include infoset
     *                      augmentations.
     *
     * @throws XNIException Thrown by handler to signal an error.
     */
    public void endElement(QName element, Augmentations augmentations) 
        throws XNIException;

    
The start of a CDATA section. 

Params:
  • augmentations – Additional information that may include infoset
                     augmentations.
Throws:
/** 
     * The start of a CDATA section. 
     *
     * @param augmentations Additional information that may include infoset
     *                      augmentations.
     *
     * @throws XNIException Thrown by handler to signal an error.
     */
    public void startCDATA(Augmentations augmentations) throws XNIException;

    
The end of a CDATA section. 

Params:
  • augmentations – Additional information that may include infoset
                     augmentations.
Throws:
/**
     * The end of a CDATA section. 
     *
     * @param augmentations Additional information that may include infoset
     *                      augmentations.
     *
     * @throws XNIException Thrown by handler to signal an error.
     */
    public void endCDATA(Augmentations augmentations) throws XNIException;

    
The end of the document fragment.

Params:
  • augmentations – Additional information that may include infoset
                     augmentations.
Throws:
/**
     * The end of the document fragment.
     *
     * @param augmentations Additional information that may include infoset
     *                      augmentations.
     *
     * @throws XNIException Thrown by handler to signal an error.
     */
    public void endDocumentFragment(Augmentations augmentations) 
        throws XNIException;

} // interface XMLDocumentFragmentHandler