メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.2625000 44.0208334, 144.2687500 44.0208334, 144.2687500 44.0250000, 144.2625000 44.0250000, 144.2625000 44.0208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral