メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.3750000 33.2125000, 131.3812500 33.2125000, 131.3812500 33.2166667, 131.3750000 33.2166667, 131.3750000 33.2125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral