srsName

In general this reference points to a CRS instance of gml:CoordinateReferenceSystemType 
				(see coordinateReferenceSystems.xsd). For well known references it is not required that the CRS description exists at the 
				location the URI points to. If no srsName attribute is given, the CRS must be specified as part of the larger context this 
				geometry element is part of, e.g. a geometric element like point, curve, etc. It is expected that this attribute will be specified 
				at the direct position level only in rare cases.