メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.349770303584 43.0568549656071, 141.349622821485 43.0574236157006, 141.349481520384 43.0580022319098, 141.347920931085 43.0577892841655, 141.348068574529 43.0572107911447, 141.348222382397 43.0566369177632, 141.349770303584 43.0568549656071)) ^^http://www.opengis.net/ont/geosparql#wktLiteral