i'd say it's a wrong direction, or at least a premature optimization. it smells like WSDL/SOAP, UML and other attempts to create a layer of abstraction which is too high level to be useful while not insightful enough for conceptualization, and too prescriptive to be practical.

how about further narrow down the scope, e.g. only focus on describe relationship among apis (how a song api related to album, musician apis)?