メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.3750000 41.0166667, 141.3812500 41.0166667, 141.3812500 41.0208334, 141.3750000 41.0208334, 141.3750000 41.0166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral