メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.454591588541 43.0419208916074, 144.454375432329 43.0414487352968, 144.454375562027 43.0412651085915, 144.455401920214 43.0408183619137, 144.456436390576 43.0404111143347, 144.45681010797 43.0413676624792, 144.454591588541 43.0419208916074)) ^^http://www.opengis.net/ont/geosparql#wktLiteral