メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.9500000 40.4916667, 139.9562500 40.4916667, 139.9562500 40.4958334, 139.9500000 40.4958334, 139.9500000 40.4916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral