I asked for
http://www.w3.org/TR/xslt20/#element-result-document
aspart of a spec draft,
as opposed to the various extensions.
As others have said, that's still part of a working draft, and hence still
unofficial.
Xalan does have a prototype XSLT/XPath 2.0 processor in progress I haven't
checked whether result-document support is one of the things which is
currently supported, but it's possible... If you want to try it, see the
"xslt20" branch on Apache's CVS server.
______________________________________
Joe Kesselman / IBM Research
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list