メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.8375000 40.0500000, 141.8437500 40.0500000, 141.8437500 40.0541667, 141.8375000 40.0541667, 141.8375000 40.0500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral