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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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This package contains interfaces to SAX2 facilities that
conformant SAX drivers won't necessarily support.

See http://www.saxproject.org
for more information about SAX.

 This package is independent of the SAX2 core, though the functionality
exposed generally needs to be implemented within a parser core.
That independence has several consequences:



SAX2 drivers are not required to recognize these handlers.


You cannot assume that the class files will be present in every SAX2
installation.

This package may be updated independently of SAX2 (i.e. new
handlers and classes may be added without updating SAX2 itself).

The new handlers are not implemented by the SAX2
org.xml.sax.helpers.DefaultHandler or
org.xml.sax.helpers.XMLFilterImpl classes.
You can subclass these if you need such behavior, or
use the helper classes found here.

The handlers need to be registered differently than core SAX2
handlers.



This package, SAX2-ext, is a standardized extension to SAX2.  It is
designed both to allow SAX parsers to pass certain types of information
to applications, and to serve as a simple model for other SAX2 parser
extension packages.  Not all such extension packages should need to
be recognized directly by parsers, however.
As an example, most validation systems can be cleanly layered on top
of parsers supporting the standardized SAX2 interfaces.