Geographic Spatial Schema (GSS) extensible markup language is a component of the XML Schema Implementation of Geographic Information Metadata documented in ISO/TS 19139:2007. GSS includes all the definitions of http://www.isotc211.org/2005/gss namespace. The root document of this namespace is the file gss.xsd. This geometry.xsd schema contains the implementation of GM_Object and GM_Point. The encoding of these classes is mapped to ISO 19136 geometric types.