メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.2250000 36.0208334, 136.2312500 36.0208334, 136.2312500 36.0250000, 136.2250000 36.0250000, 136.2250000 36.0208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral