メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.1437500 33.4875000, 131.1500000 33.4875000, 131.1500000 33.4916667, 131.1437500 33.4916667, 131.1437500 33.4875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral