Usecase: there are many kinds of dataset whose structure is specified/documented online. We ought to have a simple way in schema.org to indicate this information. For example, in the US there are initiatives like https://collegescorecard.ed.gov/data/

Note that this level of abstraction is somewhat more general than the practice of indicating specific schemas, formats, DTDs, JSON-LD contexts and similar constructs. It is closer to indicating a project / initiative or family of approaches.