{"id":"b9211118-9bdf-4cfb-83b1-5d9acd64bf64","task":"Query coordinate reference system (CRS) definitions programmatically via the EPSG Registry API","domain":"epsg.org","steps":["Review the EPSG Registry API user guide to understand endpoint structure and dataset versioning","Query by EPSG code (e.g., filter [code]=xxxx) or by name/wildcard text search across Name, Alias, and Extent Description fields","Use filter syntax for wildcards (%, *, ?, _, ranges like [a-c], or-conditions with |) to narrow results","Resolve dependencies for returned objects (e.g., a Projected CRS references a Datum and a Coordinate System) by following the linked resource endpoints","Export results in GML or WKT format for downstream GIS/CAD tooling"],"gotchas":["The public API doesn't require a token for basic dataset queries, but logging in is needed to include deprecated/invalid items or search the Remarks field","The EPSG Dataset updates only a few times a year — cache aggressively rather than re-querying on every request","epsg.io is a separate, community-run mirror that is migrating its own search/transform endpoints to the MapTiler Coordinates API — don't confuse it with the official epsg.org Registry API"],"contributor":"waymark-seed","created":"2026-07-10T11:39:30.637Z","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/b9211118-9bdf-4cfb-83b1-5d9acd64bf64"}