# Queryables

## GET /collections/{collectionId}/queryables

> Get a list of queryable attributes for this feature collection

```json
{"openapi":"3.0.1","info":{"title":"OS NGD API – Features","version":"v1.8.0"},"tags":[{"name":"Collections","description":"Retrieve information about collections"}],"servers":[{"url":"https://api.os.uk/features/ngd/ofa/v1"}],"paths":{"/collections/{collectionId}/queryables":{"get":{"tags":["Collections"],"summary":"Get a list of queryable attributes for this feature collection","operationId":"getCollectionQueryables","parameters":[{"name":"collectionId","in":"path","description":"A known collection ID.","required":true,"schema":{"type":"string","enum":["asu-gbpcd-postcodeunitarea-1","asu-gbpcd-postcodeunitpoint-1","bld-fts-building-1","bld-fts-building-2","bld-fts-building-3","bld-fts-building-4","bld-fts-buildingaccesslocation-1","bld-fts-buildingline-1","bld-fts-buildingpart-1","bld-fts-buildingpart-2","gnm-fts-crowdsourcednamepoint-1","gnm-fts-namedarea-1","gnm-fts-namedpoint-1","gnm-fts-namedroadjunction-1","lnd-fts-land-1","lnd-fts-land-2","lnd-fts-land-3","lnd-fts-landform-1","lnd-fts-landformline-1","lnd-fts-landformpoint-1","lnd-fts-landpoint-1","lus-fts-site-1","lus-fts-site-2","lus-fts-siteaccesslocation-1","lus-fts-siteaccesslocation-2","lus-fts-siteroutingpoint-1","str-fts-compoundstructure-1","str-fts-compoundstructure-2","str-fts-compoundstructure-3","str-fts-fieldboundary-1","str-fts-structure-1","str-fts-structure-2","str-fts-structure-3","str-fts-structureline-1","str-fts-structurepoint-1","trn-fts-cartographicraildetail-1","trn-fts-rail-1","trn-fts-rail-2","trn-fts-rail-3","trn-fts-roadline-1","trn-fts-roadtrackorpath-1","trn-fts-roadtrackorpath-2","trn-fts-roadtrackorpath-3","trn-fts-streetlight-1","trn-ntwk-buslane-1","trn-ntwk-connectinglink-1","trn-ntwk-connectingnode-1","trn-ntwk-cyclelane-1","trn-ntwk-ferrylink-1","trn-ntwk-ferrynode-1","trn-ntwk-ferryterminal-1","trn-ntwk-path-1","trn-ntwk-pathlink-1","trn-ntwk-pathlink-2","trn-ntwk-pathlink-3","trn-ntwk-pathnode-1","trn-ntwk-pavementlink-1","trn-ntwk-railwaylink-1","trn-ntwk-railwaylinkset-1","trn-ntwk-railwaynode-1","trn-ntwk-road-1","trn-ntwk-roadjunction-1","trn-ntwk-roadlink-1","trn-ntwk-roadlink-2","trn-ntwk-roadlink-3","trn-ntwk-roadlink-4","trn-ntwk-roadlink-5","trn-ntwk-roadnode-1","trn-ntwk-street-1","trn-ntwk-tramonroad-1","trn-rami-averageandindicativespeed-1","trn-rami-highwaydedication-1","trn-rami-maintenancearea-1","trn-rami-maintenanceline-1","trn-rami-maintenancepoint-1","trn-rami-reinstatementarea-1","trn-rami-reinstatementline-1","trn-rami-reinstatementpoint-1","trn-rami-restriction-1","trn-rami-routinghazard-1","trn-rami-routingstructure-1","trn-rami-specialdesignationarea-1","trn-rami-specialdesignationline-1","trn-rami-specialdesignationpoint-1","wtr-fts-intertidalline-1","wtr-fts-tidalboundary-1","wtr-fts-water-1","wtr-fts-water-2","wtr-fts-water-3","wtr-fts-waterpoint-1","wtr-ntwk-waterlink-1","wtr-ntwk-waterlink-2","wtr-ntwk-waterlinkset-1","wtr-ntwk-waternode-1"]}}],"responses":{"200":{"description":"A list of queryable attributes and their types for this feature collection.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/QueryablesResponse"}}}},"400":{"description":"The queryable request is not supported. Please refer to documentation for examples."},"404":{"description":"Collection '{collectionId}' is not a supported Collection. Please refer to the documentation for a list of supported Collections."},"405":{"description":"The HTTP method requested is not supported. This endpoint only supports 'GET' requests."},"406":{"description":"A request header value was not supported."}}}}},"components":{"schemas":{"QueryablesResponse":{"type":"object","properties":{"$schema":{"type":"string"},"$id":{"type":"string"},"type":{"type":"string"},"title":{"type":"string"},"description":{"type":"string"},"properties":{"type":"object","additionalProperties":{"$ref":"#/components/schemas/Queryable"}}}},"Queryable":{"type":"object","properties":{"title":{"type":"string"},"type":{"type":"string"},"format":{"type":"string"},"maxLength":{"type":"integer","format":"int32"},"pattern":{"type":"string"},"description":{"type":"string"},"hierarchy":{"type":"string"},"parent":{"type":"string"},"child":{"type":"string"},"minItems":{"type":"integer","format":"int32"},"maxItems":{"type":"integer","format":"int32"},"items":{"$ref":"#/components/schemas/Queryable"},"enum":{"type":"array","items":{"type":"string"}}}}}}}
```