From users@xml.netbeans.org mailing list:

There should be a way to add parameters to the
XSLT transformer. For example, see

    javax.xml.transform.Transformer.setParameter
(String name, Object value)

I have found that for all but the most trivial of
transformations, parameters are required.

Suggestions:
    - default to no parameters,
    - make it easy to add one or more param
name-value pairs,
    - have a way of making the parameters "sticky"
so that you can run transformations repeatedly
with the same parameter settings.

--Craeg Strong