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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 provides the core SAX APIs.
Some SAX1 APIs are deprecated to encourage integration of
namespace-awareness into designs of new applications
and into maintenance of existing infrastructure. 

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


 SAX2 Standard Feature Flags 

 One of the essential characteristics of SAX2 is that it added
feature flags which can be used to examine and perhaps modify
parser modes, in particular modes such as validation.
Since features are identified by (absolute) URIs, anyone
can define such features.   
Currently defined standard feature URIs have the prefix
http://xml.org/sax/features/ before an identifier such as
validation.  Turn features on or off using
setFeature.  Those standard identifiers are: 



    
	Feature ID
	Access
	Default
	Description
	

    
	external-general-entities
	read/write
	unspecified
	 Reports whether this parser processes external
	    general entities; always true if validating.
		
	

    
	external-parameter-entities
	read/write
	unspecified
	 Reports whether this parser processes external
	    parameter entities; always true if validating.
		
	

    
	is-standalone
	(parsing) read-only, (not parsing) none
	not applicable
	 May be examined only during a parse, after the
	    startDocument() callback has been completed; read-only.
	    The value is true if the document specified standalone="yes" in 
	    its XML declaration, and otherwise is false.
		
	

    
	lexical-handler/parameter-entities
	read/write
	unspecified
	 A value of "true" indicates that the LexicalHandler will report
	    the beginning and end of parameter entities.
		
	

    
	namespaces
	read/write
	true
	 A value of "true" indicates namespace URIs and unprefixed local names
	    for element and attribute names will be available.
		
	

    
	namespace-prefixes
	read/write
	false
	 A value of "true" indicates that XML qualified names (with prefixes) and
	    attributes (including xmlns* attributes) will be available.
		
	

    
	resolve-dtd-uris
	read/write
	true
	 A value of "true" indicates that system IDs in declarations will
	    be absolutized (relative to their base URIs) before reporting.
	    (That is the default behavior for all SAX2 XML parsers.)
	    A value of "false" indicates those IDs will not be absolutized;
	    parsers will provide the base URI from
	    Locator.getSystemId().
	    This applies to system IDs passed in 
		DTDHandler.notationDecl(),
		
DTDHandler.unparsedEntityDecl(), and
		
DeclHandler.externalEntityDecl().
	    
	    It does not apply to EntityResolver.resolveEntity(),
	    which is not used to report declarations, or to
	    LexicalHandler.startDTD(), which already provides
	    the non-absolutized URI.
	    
	

    
	string-interning
	read/write
	unspecified
	 Has a value of "true" if all XML names (for elements, prefixes,
	    attributes, entities, notations, and local names),
	    as well as Namespace URIs, will have been interned
	    using java.lang.String.intern. This supports fast
	    testing of equality/inequality against string constants,
	    rather than forcing slower calls to String.equals().
	    
	

    
    unicode-normalization-checking
    read/write
    false
     Controls whether the parser reports Unicode normalization 
        errors as described in section 2.13 and Appendix B of the 
        XML 1.1 Recommendation. If true, Unicode normalization
        errors are reported using the ErrorHandler.error() callback.
        Such errors are not fatal in themselves (though, obviously,
        other Unicode-related encoding errors may be).
		
    
    
    
	use-attributes2
	read-only
	not applicable
	 Returns "true" if the Attributes objects passed by
	    this parser in ContentHandler.startElement()
	    implement the org.xml.sax.ext.Attributes2 interface.
	    That interface exposes additional DTD-related information,
	    such as whether the attribute was specified in the
	    source text rather than defaulted.
		
	

    
	use-locator2
	read-only
	not applicable
	 Returns "true" if the Locator objects passed by
	    this parser in ContentHandler.setDocumentLocator()
	    implement the org.xml.sax.ext.Locator2 interface.
	    That interface exposes additional entity information,
	    such as the character encoding and XML version used.
		
	

    
	use-entity-resolver2
	read/write
	true
	 Returns "true" if, when setEntityResolver is given
	    an object implementing the org.xml.sax.ext.EntityResolver2 interface,
	    those new methods will be used.
	    Returns "false" to indicate that those methods will not be used.
		
	

    
	validation
	read/write
	unspecified
	 Controls whether the parser is reporting all validity
	    errors; if true, all external entities will be read.
		
	

    
	xmlns-uris
	read/write
	false
	 Controls whether, when the namespace-prefixes feature
	    is set, the parser treats namespace declaration attributes as
	    being in the http://www.w3.org/2000/xmlns/ namespace.
	    By default, SAX2 conforms to the original "Namespaces in XML"
	    Recommendation, which explicitly states that such attributes are
	    not in any namespace.
	    Setting this optional flag to "true" makes the SAX2 events conform to
	    a later backwards-incompatible revision of that recommendation,
	    placing those attributes in a namespace.
		
	

    
    xml-1.1
    read-only
    not applicable
     Returns "true" if the parser supports both XML 1.1 and XML 1.0.
        Returns "false" if the parser supports only XML 1.0.
		
    



 Support for the default values of the
namespaces and namespace-prefixes
properties is required.
Support for any other feature flags is entirely optional.


 For default values not specified by SAX2,
each XMLReader implementation specifies its default,
or may choose not to expose the feature flag.
Unless otherwise specified here,
implementations may support changing current values
of these standard feature flags, but not while parsing.


 SAX2 Standard Handler and Property IDs 

 For parser interface characteristics that are described
as objects, a separate namespace is defined.  The
objects in this namespace are again identified by URI, and
the standard property URIs have the prefix
http://xml.org/sax/properties/ before an identifier such as
lexical-handler or
dom-node.  Manage those properties using
setProperty().  Those identifiers are: 


    
	Property ID
	Description
	

    
	declaration-handler
	 Used to see most DTD declarations except those treated
	    as lexical ("document element name is ...") or which are
	    mandatory for all SAX parsers (DTDHandler).
	    The Object must implement org.xml.sax.ext.DeclHandler.
	    
	

    
        document-xml-version
         May be examined only during a parse, after the startDocument()
            callback has been completed; read-only. This property is a 
            literal string describing the actual XML version of the document, 
            such as "1.0" or "1.1".
            
        
    
    
	dom-node
	 For "DOM Walker" style parsers, which ignore their
	    parser.parse() parameters, this is used to
	    specify the DOM (sub)tree being walked by the parser.
	    The Object must implement the
	    org.w3c.dom.Node interface.
	    
	

    
	lexical-handler
	 Used to see some syntax events that are essential in some
	    applications:  comments, CDATA delimiters, selected general
	    entity inclusions, and the start and end of the DTD
	    (and declaration of document element name).
	    The Object must implement org.xml.sax.ext.LexicalHandler.
	    
	

    
	xml-string
	 Readable only during a parser callback, this exposes a TBS
	    chunk of characters responsible for the current event. 
	



 All of these standard properties are optional;
XMLReader implementations need not support them.

Feature ID	Access	Default	Description
external-general-entities	read/write	unspecified	Reports whether this parser processes external general entities; always true if validating.
external-parameter-entities	read/write	unspecified	Reports whether this parser processes external parameter entities; always true if validating.
is-standalone	(parsing) read-only, (not parsing) none	not applicable	May be examined only during a parse, after the startDocument() callback has been completed; read-only. The value is true if the document specified standalone="yes" in its XML declaration, and otherwise is false.
lexical-handler/parameter-entities	read/write	unspecified	A value of "true" indicates that the LexicalHandler will report the beginning and end of parameter entities.
namespaces	read/write	true	A value of "true" indicates namespace URIs and unprefixed local names for element and attribute names will be available.
namespace-prefixes	read/write	false	A value of "true" indicates that XML qualified names (with prefixes) and attributes (including xmlns* attributes) will be available.
resolve-dtd-uris	read/write	true	A value of "true" indicates that system IDs in declarations will be absolutized (relative to their base URIs) before reporting. (That is the default behavior for all SAX2 XML parsers.) A value of "false" indicates those IDs will not be absolutized; parsers will provide the base URI from Locator.getSystemId(). This applies to system IDs passed in DTDHandler.notationDecl(), DTDHandler.unparsedEntityDecl(), and DeclHandler.externalEntityDecl(). It does not apply to EntityResolver.resolveEntity(), which is not used to report declarations, or to LexicalHandler.startDTD(), which already provides the non-absolutized URI.
string-interning	read/write	unspecified	Has a value of "true" if all XML names (for elements, prefixes, attributes, entities, notations, and local names), as well as Namespace URIs, will have been interned using java.lang.String.intern. This supports fast testing of equality/inequality against string constants, rather than forcing slower calls to String.equals().
unicode-normalization-checking	read/write	false	Controls whether the parser reports Unicode normalization errors as described in section 2.13 and Appendix B of the XML 1.1 Recommendation. If true, Unicode normalization errors are reported using the ErrorHandler.error() callback. Such errors are not fatal in themselves (though, obviously, other Unicode-related encoding errors may be).
use-attributes2	read-only	not applicable	Returns "true" if the Attributes objects passed by this parser in ContentHandler.startElement() implement the org.xml.sax.ext.Attributes2 interface. That interface exposes additional DTD-related information, such as whether the attribute was specified in the source text rather than defaulted.
use-locator2	read-only	not applicable	Returns "true" if the Locator objects passed by this parser in ContentHandler.setDocumentLocator() implement the org.xml.sax.ext.Locator2 interface. That interface exposes additional entity information, such as the character encoding and XML version used.
use-entity-resolver2	read/write	true	Returns "true" if, when setEntityResolver is given an object implementing the org.xml.sax.ext.EntityResolver2 interface, those new methods will be used. Returns "false" to indicate that those methods will not be used.
validation	read/write	unspecified	Controls whether the parser is reporting all validity errors; if true, all external entities will be read.
xmlns-uris	read/write	false	Controls whether, when the namespace-prefixes feature is set, the parser treats namespace declaration attributes as being in the http://www.w3.org/2000/xmlns/ namespace. By default, SAX2 conforms to the original "Namespaces in XML" Recommendation, which explicitly states that such attributes are not in any namespace. Setting this optional flag to "true" makes the SAX2 events conform to a later backwards-incompatible revision of that recommendation, placing those attributes in a namespace.
xml-1.1	read-only	not applicable	Returns "true" if the parser supports both XML 1.1 and XML 1.0. Returns "false" if the parser supports only XML 1.0.

Property ID	Description
declaration-handler	Used to see most DTD declarations except those treated as lexical ("document element name is ...") or which are mandatory for all SAX parsers (DTDHandler). The Object must implement org.xml.sax.ext.DeclHandler.
document-xml-version	May be examined only during a parse, after the startDocument() callback has been completed; read-only. This property is a literal string describing the actual XML version of the document, such as "1.0" or "1.1".
dom-node	For "DOM Walker" style parsers, which ignore their parser.parse() parameters, this is used to specify the DOM (sub)tree being walked by the parser. The Object must implement the org.w3c.dom.Node interface.
lexical-handler	Used to see some syntax events that are essential in some applications: comments, CDATA delimiters, selected general entity inclusions, and the start and end of the DTD (and declaration of document element name). The Object must implement org.xml.sax.ext.LexicalHandler.
xml-string	Readable only during a parser callback, this exposes a TBS chunk of characters responsible for the current event.