メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.357082083551 43.04904897358, 141.356603350521 43.0490638733686, 141.356767294196 43.0484119292837, 141.357082083551 43.04904897358)) ^^http://www.opengis.net/ont/geosparql#wktLiteral