Conformance classes

[evanp]

Can we define conformance classes for implementers of PTD?

[tantek]

We should. I can think of a couple useful ones from existing implementation experience:

• Type Discovery Function - consumes untyped posts from an untyped format or protocol, and outputs a simple string of the type output of the algorithm
• AS2 Proxy - consumes untyped posts from an untyped format or protocol, and outputs valid AS2 JSON or other object structures

[tantek]

The specification must use at least one MUST requirement (feedback from @BigBlueHat), e.g. in the algorithm.

[tantek]

No longer a CR-blocker (because PTD is Note-track), however, still useful. Keeping issue open accordingly.

[tantek]

Defined the above two mentioned conformance classes with this commit: f9c01df