メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.4437500 40.5458334, 141.4500000 40.5458334, 141.4500000 40.5500000, 141.4437500 40.5500000, 141.4437500 40.5458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral