メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.0375000 33.2000000, 129.0437500 33.2000000, 129.0437500 33.2041667, 129.0375000 33.2041667, 129.0375000 33.2000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral