Root property element of an OASIS GML instance Container for optional OASIS GML attributes Root property type for an OASIS GML instance Container for optional OASIS GML attributes Point property element containing a pair of coordinates representing latitude then longitude in the WGS84 coordinate reference system This type contains a gml:Point. Unlike a gml:PointPropertyType, it does not enable reference to an external gml:Point via an xlink. Line property element containing a list of pairs of coordinates representing latitude then longitude in the WGS84 coordinate reference system This type contains a gml:LineString. Closed ring property element containing a list of pairs of coordinates (first pair and last pair identical) representing latitude then longitude in the WGS84 coordinate reference system This type contains a gml:Polygon Rectangular envelope property element containing two pairs of coordinates (lower left envelope corner, upper right envelope corner) representing latitude then longitude in the WGS84 coordinate reference system This type contains a gml:Envelope Optional additional parameters for a oasis location property Optional where attribute indicating the type of geographic entity is being referred to. Default is "location" Optional where attribute indicating how geotagged content is related to the represented location. Default is "isLocatedAt" Optional where attribute indicating a GPS-measured elevation in meters (e.g. WGS84 geoid height) Optional where attribute indicating elevation by building floor Optional where attribute indicating size in meters of a radius or buffer being indicated around the geometry (e.g. radius of circular area around a point geometry