How can credentials with different schemas be part of the LinkedClaim graph

[gvelez17]

So OpenCreds for example have a different schema and way of being viewed

but, they also have an issuer, they have attestations about them, and most of the fields could map to our standard LinkedClaims

Can we do some kind of IS-A relation so that we know if a claim is also a credential with deeper schema and has special way of being viewed, but otherwise can be normally in the graph?

Does this make sense to people, can we discuss, or what are other approaches you suggest?

See Ahmed's PR #177 for adding the opencreds credentials