メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.5750000 44.1666667, 143.5812500 44.1666667, 143.5812500 44.1708334, 143.5750000 44.1708334, 143.5750000 44.1666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral