メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.4437500 33.5541667, 131.4500000 33.5541667, 131.4500000 33.5583333, 131.4437500 33.5583333, 131.4437500 33.5541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral