メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.3500000 40.5041667, 141.3562500 40.5041667, 141.3562500 40.5083333, 141.3500000 40.5083333, 141.3500000 40.5041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral