メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.4750000 34.6541667, 129.4812500 34.6541667, 129.4812500 34.6583333, 129.4750000 34.6583333, 129.4750000 34.6541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral