メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.0500000 39.7750000, 141.0562500 39.7750000, 141.0562500 39.7791667, 141.0500000 39.7791667, 141.0500000 39.7750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral