メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.764995670166 43.2071561161495, 141.764306912834 43.2079125986374, 141.764030256948 43.2077730187977, 141.763190855271 43.2073264548938, 141.763795980125 43.2066665350286, 141.763895384318 43.206588612629, 141.764905333321 43.2071087537426, 141.764995670166 43.2071561161495)) ^^http://www.opengis.net/ont/geosparql#wktLiteral