This site hosts Alex Miłowski's “private” drafts of XProc 2.0: An XML Pipeline Language baked fresh automagically by Travis CI after every commit.
http://www.w3.org/ns/xprochttp://www.w3.org/ns/xproc-stephttp://www.w3.org/ns/xproc-errorhttp://www.w3.org/ns/xprochttp://www.w3.org/ns/xproc-stephttp://www.w3.org/ns/xproc-errorThese documents have all the normative force one would expect of the scribblings of a mad man.
If you have a question or comment about the XProc specification, please raise it as an issue on the specification repository.