We’ve finalized the first stable schema used for the plan document in Sandpiper.
The plan document, in brief, describes the state of the actors in a Sandpiper agreement, and their relationship to one another. It encapsulates these in an implementation-neutral XML format that the two partners independently generate from their own internal ledger for that relationship, which they can compare to confirm that they share the same understanding, unambiguously.
edit: I’ve renamed this to 0.9.4 to try to keep it at least in the same epoch as the other schema documents. It’s time I set these up in a public repository; internally I keep them in git but haven’t pushed it anywhere.