メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.637360837087 43.9403296714801, 141.638378964356 43.9411268277539, 141.637389994628 43.9417678756186, 141.636406407667 43.9409859283193, 141.635876519248 43.9412636635348, 141.63583491651 43.9398989431585, 141.636409699464 43.9395412194278, 141.637360837087 43.9403296714801)) ^^http://www.opengis.net/ont/geosparql#wktLiteral