メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.638356517634 43.939710377565, 141.639321620014 43.9404922057997, 141.638378964356 43.9411268277539, 141.637360837087 43.9403296714801, 141.636409699464 43.9395412194278, 141.637382309235 43.9389222440092, 141.638356517634 43.939710377565)) ^^http://www.opengis.net/ont/geosparql#wktLiteral