メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.9250000 36.0875000, 139.9312500 36.0875000, 139.9312500 36.0916667, 139.9250000 36.0916667, 139.9250000 36.0875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral