メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.907003207274 43.4911608181678, 141.906210259859 43.491280461407, 141.90588604202 43.4901121073574, 141.906658910811 43.4899876234067, 141.906703889499 43.4899805844007, 141.907003207274 43.4911608181678)) ^^http://www.opengis.net/ont/geosparql#wktLiteral