メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.373239912372 43.0472675251815, 141.372877955424 43.0475007098033, 141.372431175982 43.0477642594464, 141.371425667995 43.0469016844427, 141.371867556652 43.0466110952994, 141.372644545306 43.0461141917821, 141.373644288854 43.0470114544938, 141.373239912372 43.0472675251815)) ^^http://www.opengis.net/ont/geosparql#wktLiteral