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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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// SAX DTD handler.
// http://www.saxproject.org
// No warranty; no copyright -- use this as you will.
// $Id: DTDHandler.java 226184 2005-04-08 10:53:24Z neeraj $

package org.xml.sax;

/**
 * Receive notification of basic DTD-related events.
 *
 * 
 * This module, both source code and documentation, is in the
 * Public Domain, and comes with NO WARRANTY.
 * See http://www.saxproject.org
 * for further information.
 * 
 *
 * If a SAX application needs information about notations and
 * unparsed entities, then the application implements this 
 * interface and registers an instance with the SAX parser using 
 * the parser's setDTDHandler method.  The parser uses the 
 * instance to report notation and unparsed entity declarations to 
 * the application.
 *
 * Note that this interface includes only those DTD events that
 * the XML recommendation requires processors to report:
 * notation and unparsed entity declarations.
 *
 * The SAX parser may report these events in any order, regardless
 * of the order in which the notations and unparsed entities were
 * declared; however, all DTD events must be reported after the
 * document handler's startDocument event, and before the first
 * startElement event.
 * (If the {@link org.xml.sax.ext.LexicalHandler LexicalHandler} is
 * used, these events must also be reported before the endDTD event.)
 * 
 *
 * It is up to the application to store the information for 
 * future use (perhaps in a hash table or object tree).
 * If the application encounters attributes of type "NOTATION",
 * "ENTITY", or "ENTITIES", it can use the information that it
 * obtained through this interface to find the entity and/or
 * notation corresponding with the attribute value.
 *
 * @since SAX 1.0
 * @author David Megginson
 * @version 2.0.1 (sax2r2)
 * @see org.xml.sax.XMLReader#setDTDHandler
 */
public interface DTDHandler {
    
    
    /**
     * Receive notification of a notation declaration event.
     *
     * It is up to the application to record the notation for later
     * reference, if necessary;
     * notations may appear as attribute values and in unparsed entity
     * declarations, and are sometime used with processing instruction
     * target names.
     *
     * At least one of publicId and systemId must be non-null.
     * If a system identifier is present, and it is a URL, the SAX
     * parser must resolve it fully before passing it to the
     * application through this event.
     *
     * There is no guarantee that the notation declaration will be
     * reported before any unparsed entities that use it.
     *
     * @param name The notation name.
     * @param publicId The notation's public identifier, or null if
     *        none was given.
     * @param systemId The notation's system identifier, or null if
     *        none was given.
     * @exception org.xml.sax.SAXException Any SAX exception, possibly
     *            wrapping another exception.
     * @see #unparsedEntityDecl
     * @see org.xml.sax.Attributes
     */
    public abstract void notationDecl (String name,
				       String publicId,
				       String systemId)
	throws SAXException;
    
    
    /**
     * Receive notification of an unparsed entity declaration event.
     *
     * Note that the notation name corresponds to a notation
     * reported by the {@link #notationDecl notationDecl} event.  
     * It is up to the application to record the entity for later 
     * reference, if necessary;
     * unparsed entities may appear as attribute values. 
     * 
     *
     * If the system identifier is a URL, the parser must resolve it
     * fully before passing it to the application.
     *
     * @exception org.xml.sax.SAXException Any SAX exception, possibly
     *            wrapping another exception.
     * @param name The unparsed entity's name.
     * @param publicId The entity's public identifier, or null if none
     *        was given.
     * @param systemId The entity's system identifier.
     * @param notationName The name of the associated notation.
     * @see #notationDecl
     * @see org.xml.sax.Attributes
     */
    public abstract void unparsedEntityDecl (String name,
					     String publicId,
					     String systemId,
					     String notationName)
	throws SAXException;
    
}

// end of DTDHandler.java