メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.756728840358 43.197939589717, 141.756315899675 43.1983775032132, 141.755932533313 43.1987830499286, 141.755004574345 43.1983090397453, 141.755383049486 43.1978963013227, 141.755832783798 43.1974676932715, 141.756728840358 43.197939589717)) ^^http://www.opengis.net/ont/geosparql#wktLiteral