メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.0750000 44.0958334, 145.0812500 44.0958334, 145.0812500 44.1000000, 145.0750000 44.1000000, 145.0750000 44.0958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral