メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.102348371868 43.8234203950077, 144.100924697363 43.8238535219856, 144.100244603875 43.8227655566726, 144.100948321684 43.8225630722671, 144.101692460492 43.8223362301895, 144.102348371868 43.8234203950077)) ^^http://www.opengis.net/ont/geosparql#wktLiteral