メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.759759324998 43.1947377584044, 141.758855097718 43.1942698543251, 141.75951405258 43.1935557579835, 141.759535355781 43.1935662582864, 141.760441752953 43.1940269189447, 141.759759324998 43.1947377584044)) ^^http://www.opengis.net/ont/geosparql#wktLiteral