acronyms used in HTTP2 draft

Question

When I read "5.1. Stream States" in http2 draft, I felt difficult to understand "Figure 1: Stream States" because I couldn't find a description for the acronyms used in the figure.

My guesses are:

• PP: PUSH_PROMISE
• H: HEADERS
• ES: END_STREAM
• R: response?

Are they right?

ps. I already asked this question to HTTP mailing list last month but have not get any answer yet.

Answer 1

From the draft I read R = RST_STREAM. I guess, you got the other acronyms right...