Thirteen closed vocabularies, 104 terms: matter_type, matter_status, forum_type, party_role, party_kind, relief_type, event_type, ai_role, law_relation, verification, jurisdiction_level, pii_class and redaction_policy. code is the API value; label and description are for display.

These are the exact values the /enforcement/matters filters accept, which is why the endpoint is open: a documented filter whose valid values are undiscoverable is not a filter.

TWO OF THEM DESCRIBE WHAT WE DO NOT PUBLISH. pii_class and redaction_policy are the terms behind the party gate that withholds 138 of 235 party rows. Publishing the vocabulary is how that policy becomes checkable rather than merely asserted.