Are there any examples of "programs as databases" being applied to structured text like JSON or YAML? Something like a generic system which takes a set of rules/facts and the source data, and transforms these into a queryable data structure.

I'm working with a lot of OpenAPI [1] specifications currently, some of which span tens of thousands of lines. Heaps of parent, child, sibling type relationships, and objects which are defined-once and referenced in many places. It would be nice if I could perform a search like "select all schemas used in this path" or "select the count of references to this parameter".

[1] https://github.com/OAI/OpenAPI-Specification/blob/master/ver...