Section 4 - Why list "state" here and none of the others here?

[Nat Sakimura]

Why list "state" here and none of the others here? I think I know why (you expect state to vary on each request but not others) but a lot of inferring needs to happen from the reader. For the extension defined in this document, one uses either request_uri or request (but not both, right? I'm not sure it's explicitly stated anywhere) and whatever other parameters are needed in the given situation. Maybe just some text towards that end rather than the list format? (Brian Campbell)

Accept in principle. Added text to explain it, and removed state as it does not have to be repeated here.