メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.1500000 39.6875000, 140.1562500 39.6875000, 140.1562500 39.6916667, 140.1500000 39.6916667, 140.1500000 39.6875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral