メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.7812500 37.0166667, 137.7875000 37.0166667, 137.7875000 37.0208334, 137.7812500 37.0208334, 137.7812500 37.0166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral