メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.5437500 34.0875000, 131.5500000 34.0875000, 131.5500000 34.0916667, 131.5437500 34.0916667, 131.5437500 34.0875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral