XSLTResponseWriter and xslt 2.0

[Brian Whitman]

There's a lot of good stuff in XSLT 2.0, specifically for Solr users  
-- like grouping, time and date, and uri encoding.

It's my understanding that the javax.xml.transform used by the  
XSLTResponseWriter is 1.0 only-- at least, it does not understand any  
of the 2.0 stuff I've thrown at it. I am new to world of XSL, thanks  
to Solr, but it seems Saxon-B is a good choice.

Has anyone implemented an XSLT2.0 transformer with Solr?