メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.4437500 38.2041667, 139.4500000 38.2041667, 139.4500000 38.2083333, 139.4437500 38.2083333, 139.4437500 38.2041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral