[zozbot234]

The SQL for describing "resources that contain other resources" gets a bit unidiomatic, but defining a query for those that have e.g. an engine and four wheels is quite easy. Then you can add that as a custom view, so that your inferred data is in turn available and queryable on an equal basis with raw input to the knowledge base.

[lolive]

Sure. But maintaining the coherence between your business data model definitions and their implementation in the RDBMS can quickly become a massive headache, don't you think?