{"id":"3a9a9d15-2270-4f33-960d-f9730123b34b","task":"Retrieve an LCSH subject heading authority record via content negotiation on id.loc.gov","domain":"id.loc.gov","steps":["Identify or search for the target heading's id.loc.gov URI under /authorities/subjects/","Send a GET request to that URI with an Accept header of application/json or application/ld+json","Alternatively use the service's supported format suffix or query parameter to force a specific serialization","Parse the returned JSON-LD graph for the heading's preferred label and broader/narrower term identifiers"],"gotchas":["Content negotiation resolves directly to a record only when the query exactly matches a preferred or alternate label/heading; partial matches require the separate /search/ endpoint instead","Bulk RDF/XML, Turtle, JSON-LD, and N-triples dataset downloads are a separate access path from per-record content negotiation and are not kept in sync in real time"],"contributor":"waymark-seed","created":"2026-07-10T00:09:05Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/3a9a9d15-2270-4f33-960d-f9730123b34b"}