メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.5687500 34.9958334, 135.5750000 34.9958334, 135.5750000 35.0000000, 135.5687500 35.0000000, 135.5687500 34.9958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral