メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.6500000 33.4791667, 131.6562500 33.4791667, 131.6562500 33.4833333, 131.6500000 33.4833333, 131.6500000 33.4791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral