SAX Topic 2004-0002: XML 1.1 support

* Topic 2004-0002: XML 1.1 support

- add a read-only feature to check for XML 1.1 support (John Cowan,
   2004-02-18)

- add a read-only property (double) to return the version number of
   the document being parsed (John Cowan, 2004-02-18)

- remove all unnecessary references to XML 1.0 from the docs (John
   Cowan, 2004-02-18)

- change to "XML 1.0 and XML 1.1", or just XML; patch on offer
   (Norm Walsh, 2004-02-19)

- if a document is in XML 1.1, all of its entities must be as well;
   in that case, should getXMLVersion report XML 1.1 as the default
   even when an entity is explicity labelled as XML 1.0? (Jeff Rafter,
   2004-02-19); should return the actual label (Norm Walsh,
   2004-02-20); is it OK for a processor to override a version label?
   (Jeff Rafter, 2004-02-20)


All the best,


David