GML defines an XML data encoding for geographic data and a grammar to express models of such data using XML Schema. GML has come into wide use since it was first adopted as an OGC standard in 2001 ( http://www.ogcnetwork.net/gmlprofiles for examples). GML is the standard that enables information communities and other standards organizations such as the Internet Engineering Task Force (IETF) and OASIS to insert geospatial elements into their standards and be confident that their standards will be compatible with mainstream information infrastructure methods of conveying spatial/temporal
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