メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.0000000 34.6666667, 135.0031250 34.6666667, 135.0031250 34.6687501, 135.0000000 34.6687501, 135.0000000 34.6666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral