メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.364497891869 43.7771103222185, 142.363661337182 43.7773475091463, 142.361106810768 43.7781779035812, 142.362174554693 43.77637530605, 142.362901237403 43.776600877307, 142.363651792418 43.7768467797328, 142.364497891869 43.7771103222185)) ^^http://www.opengis.net/ont/geosparql#wktLiteral