メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.523381401395 43.8530134178646, 141.523101600048 43.853632548799, 141.519217809639 43.8526764531177, 141.519440314624 43.8521528272023, 141.51945717274 43.8521210791689, 141.519472142461 43.852092817791, 141.523381401395 43.8530134178646)) ^^http://www.opengis.net/ont/geosparql#wktLiteral