anyone know the XSLT incremental subset?

I am curious whether anyone has precisely specified
the subset of XSLT which is amendable to iterative
(i.e. streaming) processing? Assumedly the subset
would be of select expressions, as none of the XSLT
elements theoretically require non-iterativity.

i know the topic has been around a few times, both in
'99 and in '00 - and I did check the archives (both
here and on xml-dev) without any luck.

thanks!

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