メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.339490302122 43.0916330099859, 141.339366387225 43.092127066705, 141.337862699219 43.0919299017881, 141.337986933133 43.0914215727558, 141.338125546899 43.0909204609178, 141.339629054565 43.0911283111007, 141.339490302122 43.0916330099859)) ^^http://www.opengis.net/ont/geosparql#wktLiteral