JAXP: namespaces/namespace-prefixes features for SAXRe

Hi all,

I am reading output of an XSLT transformation through
javax.xml.transform.sax.SAXResult. It looks very similar 
to using an XMLReader: I set a ContentHandler and 
get information through its callbacks. However, an
XMLReader can deliver parse results in a variety 
of ways. In particular:

- qNames can be present or null;
- start/endPrefixMapping() events may be fired or skipped;
- xmlns:* attributes may be present or absent in the attribute lists.

For an XMLReader, I can tame this zoo through setFeature() method, using 
two features http://xml.org/sax/features/namespaces and
http://xml.org/sax/features/namespace-prefixes
(a  table at http://www.saxproject.org/?selected=namespaces, 
"Configuring Namespace Support" unambiguously defines behaviour 
for each feature combination). Even if the parser does not support 
a particular pairing, I can at least query its capabilities, and adjust 
my ContentHandler accordingly.

Now I pass to JAXP. The same ContentHandler is fed to a Transformer 
(wrapped into a SAXResult); so I would expect either the Transformer 
or its mother TransformerFactory to recognize SAX2 features. I have 
browsed the whole JAXP 1.1 specification looking for a way to set 
(or at least to query) the features, but in vain. I could not even find 
the exact description of the default behaviour. Looks like the choice 
of values for SAX properties is implementation-dependent - but this
would undermine the whole idea of pluggability, so I am definitely 
missing some important piece of the puzzle.

In view of the above, my questions are:

1) What is the default behaviour of Transformer wrt 
namespaces/namespace-prefixes? Where in the JAXP spec 
is it defined?

2) Can I query or modify SAX2 parser features for a JAXP Transformer
object?  If yes, how?

Thanks to anyone willing to get me out of the impasse.

Regards,
Nikolai Grigoriev
RenderX






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