メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.520121860962 39.2259551470371, 140.519347976868 39.2251848220076, 140.520278984989 39.2245700323297, 140.520627455375 39.2240158923749, 140.521020636758 39.2238644342649, 140.521195214428 39.2238352009261, 140.521271364592 39.223873549505, 140.520121860962 39.2259551470371)) ^^http://www.opengis.net/ont/geosparql#wktLiteral