メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.0812500 34.6958334, 135.0875000 34.6958334, 135.0875000 34.7000000, 135.0812500 34.7000000, 135.0812500 34.6958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral