メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.4375000 34.2041667, 131.4437500 34.2041667, 131.4437500 34.2083333, 131.4375000 34.2083333, 131.4375000 34.2041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral