@evan yes, that much is clear. It is the level where things make sense: reuse well-understood vocabularies.
Except my mix'n match of common JSON-LD props doesn't match yours, and we can only understand each other going the full monty on linked data support.
Or avoid the convergence in how we defined the same semantics differently by having a specs site somewhere and agree to do things the same way to a certain extend, and get reliable expectations when interfacing/integrating our apps.