メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.407745014319 43.8164172902084, 142.406053181254 43.8176157572294, 142.405585523976 43.8172991457259, 142.407244966874 43.8160773473975, 142.408167875905 43.8154038917792, 142.408678762147 43.8157672137007, 142.407745014319 43.8164172902084)) ^^http://www.opengis.net/ont/geosparql#wktLiteral