I obviously need to finish reading specs before I ask stupid questions. rpc.capnp documents the release message quite clearly.
-- You received this message because you are subscribed to the Google Groups "Cap'n Proto" group. To unsubscribe from this group and stop receiving emails from it, send an email to capnproto+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/capnproto/124b8ee8-2952-4416-9c2d-bcf8c285c02fn%40googlegroups.com.