メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.8375000 39.9916667, 141.8437500 39.9916667, 141.8437500 39.9958334, 141.8375000 39.9958334, 141.8375000 39.9916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral