Comment by dpim

This looks a lot like OData - a REST-ful API standard with schema introspection, patterns for defining and traversing resource relationships, well-defined guidance around mechanics, tooling support. In particular, the "Microtypes" concept resembles how entities work in OData - rich query support for collections (eg. sorts, filters, order by), "expansions" on related resources, even inheritance semantics (ie. being able to request a derived entity as its parent type).