メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.921366221881 43.5013732731542, 141.917407855875 43.5020026578853, 141.916901280235 43.5003210094469, 141.920738210299 43.4997221978416, 141.920793122961 43.5001567286657, 141.920848109628 43.5005774049732, 141.920937412538 43.5008313316321, 141.921079340494 43.5010680723924, 141.921347461209 43.501359013268, 141.921366221881 43.5013732731542)) ^^http://www.opengis.net/ont/geosparql#wktLiteral