メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.383604376718 43.7721686784401, 142.382851659328 43.7720410487037, 142.382075908497 43.7706671388074, 142.382330799602 43.7706034347367, 142.383701942435 43.7706684708264, 142.383604376718 43.7721686784401)) ^^http://www.opengis.net/ont/geosparql#wktLiteral