メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.366102810107 45.1256417295044, 142.364557639541 45.1254772542331, 142.364782395016 45.1246181819233, 142.366351822971 45.1247940884962, 142.366102810107 45.1256417295044)) ^^http://www.opengis.net/ont/geosparql#wktLiteral