メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.6500000 39.0166667, 141.6562500 39.0166667, 141.6562500 39.0208334, 141.6500000 39.0208334, 141.6500000 39.0166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral