メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.275841633865 44.0209655859359, 144.275820359925 44.0210961750846, 144.274238418843 44.0209413433093, 144.274345132216 44.0203550780139, 144.275931237817 44.0205067293425, 144.275841633865 44.0209655859359)) ^^http://www.opengis.net/ont/geosparql#wktLiteral