メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4812500 36.0166667, 140.4875000 36.0166667, 140.4875000 36.0208334, 140.4812500 36.0208334, 140.4812500 36.0166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral