メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.905863428326 43.4985011238292, 141.905834683897 43.4985061360153, 141.905539832561 43.4973248231068, 141.906340800182 43.4971942780954, 141.906662333769 43.4983620967533, 141.905863428326 43.4985011238292)) ^^http://www.opengis.net/ont/geosparql#wktLiteral