[xsl] xslt/xinclude

[Mike Sokolov <sokolov@xxxxxxxxxxxx>]

I have some questions about xinclude support in xslt 2.0.  I did some 
reading, but couldn't quickly find the answer, and I'm sure you all are 
the best authority on this, so...

I understand that xinclude processing may be implemented by xslt 2.0 
processors: if it is, is it always on, or on by default?

Is there a standard way to enable/disable xinclude (via 
javax.xml.transform API calls) - I didn't see anything there, and finally:

is it generally supported by most processors?

Thanks for your help

-Mike