メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.352217978572 43.0663920606899, 141.352068674633 43.0669538774284, 141.350524210365 43.0667632438152, 141.350670334623 43.0661770704207, 141.350819650511 43.0655823418527, 141.351658656701 43.0656954845021, 141.352371994419 43.0657897716839, 141.352217978572 43.0663920606899)) ^^http://www.opengis.net/ont/geosparql#wktLiteral