TPAC Agenda Item: Streaming XProc

One topic that might be good to discuss while we have implementors in the
same room would be Streaming XProc.  It might be good to start a discussion
about the implementation challenges, types of streaming, and pipeline
structures stream "better" than others and in what situations they do so.

Ultimately, we might want to publish a note about our findings.

-- 
--Alex Milowski
"The excellence of grammar as a guide is proportional to the paucity of the
inflexions, i.e. to the degree of analysis effected by the language
considered."

Bertrand Russell in a footnote of Principles of Mathematics