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To see all available qualifiers, see our documentation.
https://github.com/KoelnAPI/data/
example api: https://geoportal.stadt-koeln.de/arcgis/rest/services/Statistische_Daten/OSM_Hausnummern/MapServer/0/query?where=objectid%20is%20not%20null&text=&objectIds=&time=&geometry=&geometryType=esriGeometryEnvelope&inSR=&spatialRel=esriSpatialRelIntersects&relationParam=&outFields=%2A&returnGeometry=true&returnTrueCurves=false&maxAllowableOffset=&geometryPrecision=&outSR=4326&returnIdsOnly=false&returnCountOnly=false&orderByFields=OBJECTID&groupByFieldsForStatistics=&outStatistics=&returnZ=false&returnM=false&gdbVersion=&returnDistinctValues=false&resultOffset=&resultRecordCount=&f=geojson