メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.901131196478 43.4644656162199, 141.899241858324 43.464757339876, 141.899032492004 43.4640506465682, 141.898812692919 43.4633169164507, 141.900715923032 43.4630239763834, 141.901004229667 43.4640152274819, 141.901131196478 43.4644656162199)) ^^http://www.opengis.net/ont/geosparql#wktLiteral