メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.5687500 35.5041667, 139.5750000 35.5041667, 139.5750000 35.5083333, 139.5687500 35.5083333, 139.5687500 35.5041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral