Added section about W3C Verifiable Credential/Presentation representation

[Artemkaaas]

Add section describing how AnonCreds credentials and presentations can be represented in the W3C Data Model standard.

[swcurran]

@Artemkaaas -- please address the conflicts. Should be easy :-)

[swcurran]

Looks good!

I think there are some style adjustments to be made -- e.g. when/where to use [[ref:]]-- to be consistent with the rest of the spec. However, I suggest that since I'm about to do a pass to align that across the spec, I can do that in a follow up PR. I also saw a couple of cleanups, but I think they can be adjusted during that edit cleanup pass that is planned.

The only thing that I think is under explained is the use of MessagePack in the spec. I think there should be a sub-section and overview of how MessagePack is used, and at least a link to the MessagePack spec.

[swcurran]

Did you mean to remove revocation_registry as well here? Or was that not supposed to be there, since it is not in the example?

[Artemkaaas]

It seems you look outdated version. revocation_registry is not there anymore.

[swcurran]

That’s why I commented. This commit removed the encoding everywhere else, but in this one place it also removed the “revocation_registry” line — different from the intent of the commit. I’m sure it is fine, but just wanted to make sure you intended to do that. Sounds like you did.