メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.3250000 39.0208334, 141.3312500 39.0208334, 141.3312500 39.0250000, 141.3250000 39.0250000, 141.3250000 39.0208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral