メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.407207252336 43.8147057431241, 142.408167875905 43.8154038917792, 142.407244966874 43.8160773473975, 142.405585523976 43.8172991457259, 142.4045944087 43.8166205303541, 142.404162658642 43.8162986779036, 142.406759384177 43.8144034368966, 142.407207252336 43.8147057431241)) ^^http://www.opengis.net/ont/geosparql#wktLiteral