FEP-0837: Federated Marketplace

One thing that I don’t like about FEP-0837 is how resources are described. Currently we describe them using the resourceConformsTo property, which value is an URI.

In the Proposal example, the primary intent is “bicycle” (https://www.wikidata.org/wiki/Q11442) and the reciprocal intent is “US dollar” (https://www.wikidata.org/wiki/Q4917).

I think implementers may want to point to an ActivityPub object, such as Image representing a bicycle, instead of a Wikidata page.

@lynnfoster can we use resourceConformsTo for this? Maybe there is a better property?