メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.5375000 37.0875000, 139.5437500 37.0875000, 139.5437500 37.0916667, 139.5375000 37.0916667, 139.5375000 37.0875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral