#Existing Standards ##General Standards Data Catalogs CKAN API Data Catalog Vocabulary (DCAT) Data.json and Common Core Metadata OGC Catalogue Standard (CSW) Socrata Open Data API (SODA) Geospatial Data GeoJSON Keyhole Markup Language (KML) OGC GeoPackage OGC WMS/WFS/WCS/WMTS/WPS Shapefile