メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.6875000 33.0916667, 131.6937500 33.0916667, 131.6937500 33.0958334, 131.6875000 33.0958334, 131.6875000 33.0916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral