xtags:copyOf & x:style

hi, 

i need to apply an xslt transform to a subset of nodes in an XML document that i
get back from a call to a webservice, using xTags. Is there any way to do that?
I thought perhaps I could do an xtags:copyOf , to get the subset of nodes, and
then apply an xtags:style to just that subset. However, since xtags:copyOf
doesn't have an id attribute, I can't figure out how to apply the xtags:style to
it. 

(I tried to do the same thing using the JSTL tag libs, but couldn't figure out a
way to do it that way, hence I am now trying apache xtags  to see if they can do
the trick)

Any help would be appreciated ! 

thanks,
Sonal