メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.2187500 34.9041667, 135.2250000 34.9041667, 135.2250000 34.9083333, 135.2187500 34.9083333, 135.2187500 34.9041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral