メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.376464940193 43.7618439071315, 142.376600642398 43.7621068489488, 142.376754716495 43.7623908493797, 142.375238709489 43.7628388888629, 142.37494963032 43.7622897271874, 142.374652653527 43.7617539869371, 142.376177022158 43.7613134703495, 142.376464940193 43.7618439071315)) ^^http://www.opengis.net/ont/geosparql#wktLiteral