メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.752521885955 43.1952257175774, 141.751732017781 43.1960371078899, 141.750838339073 43.1955710211004, 141.750805891344 43.1955540702694, 141.751584080795 43.1947550844247, 141.752490676445 43.1952100391794, 141.752521885955 43.1952257175774)) ^^http://www.opengis.net/ont/geosparql#wktLiteral