メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.916721637097 38.5473433847328, 140.914845465354 38.5475209422845, 140.913262936129 38.5476635005034, 140.912151734693 38.5477591287611, 140.912013869039 38.5467310687875, 140.916567541223 38.5463273048909, 140.916702087316 38.5472030552519, 140.916721637097 38.5473433847328)) ^^http://www.opengis.net/ont/geosparql#wktLiteral