メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.0187500 35.0333333, 135.0250000 35.0333333, 135.0250000 35.0375000, 135.0187500 35.0375000, 135.0187500 35.0333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral