メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.3750000 40.6916667, 141.3812500 40.6916667, 141.3812500 40.6958334, 141.3750000 40.6958334, 141.3750000 40.6916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral