メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.8375000 38.1041667, 140.8437500 38.1041667, 140.8437500 38.1083333, 140.8375000 38.1083333, 140.8375000 38.1041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral