メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.3500000 38.0791667, 139.3562500 38.0791667, 139.3562500 38.0833333, 139.3500000 38.0833333, 139.3500000 38.0791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral