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. |