Handling roles for creators

[HadrienGardeur]

This is a follow-up to #151 and the recent #161 pull request.

Now that our WebIDL can support multiple creators and canonical identifiers for them, we need to continue discussing how roles will be handled.

I think there are essentially two different solutions:

• using a generic element with a specialized vocabulary for roles (like in EPUB 2/3 where we use dc:creatorand dc:contributor + MARC relators)
• using specialized elements per role (for instance, roles extracted from schema.org)

RWPM is a mix of both with the following dedicated roles that are mapped to schema.org: author, translator, editor, artist, illustrator, letterer, penciler, colorist, inker and narrator.

As a fallback option, RWPM also has a contributor element (also mapped to schema.org) with a role member that relies on MARC relators.

The exact scope of our infoset is vague, but my personal preference would be to align with schema.org and adopt at least a subset of the roles that are available.

[iherman]

I think in general aligning with schema.org is a good move. It is time publications are recognized by schema, and that their metadata end up in various knowledge graphs...

[HadrienGardeur]

This is now covered by our draft: https://w3c.github.io/wpub/#wp-creator-manifest