メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.8625000 33.1041667, 129.8687500 33.1041667, 129.8687500 33.1083333, 129.8625000 33.1083333, 129.8625000 33.1041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral