メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.752796135236 42.9030515636876, 140.752084767347 42.9031013991393, 140.751358949319 42.9031395069844, 140.750494767954 42.9031785395776, 140.750421714121 42.9023596998175, 140.751283482599 42.9023170495337, 140.751995741318 42.9022814372865, 140.752726379132 42.9022413492488, 140.752796135236 42.9030515636876)) ^^http://www.opengis.net/ont/geosparql#wktLiteral