catalog

The schema catalog, or null when RaboshOptions.schema is false.

Attached and maintained by this object. null rather than an empty catalog, because a model that was never collected and a model of nothing are different answers and the type should say which one this is.

Outside the stable core. schema and indexCandidates are the stable way to the model; this is the way to the sketches behind it, which are a format rather than an answer.