Definitions already exist for Dataset and DataCatalog, which help define a collection of data records or a catalog of those collections. I've looked though almost all of the definitions on schema.org, but I can't find one to identify a data schema (the structure of the data that's stored within a Dataset).

Without getting too much into the details, I need to create a few CommunicateAction events that have an about value with a @type referring to a database schema. Does a definition already exist that serves this purpose? If not, do you have any suggestions for how best to represent a data schema as the subject for an action?

Note: I currently have a way to create JSON-schema documents for the schemas in question.