メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.992866882073 43.5557591814533, 144.993397316774 43.5561166695389, 144.992659602894 43.5567263618706, 144.992129051725 43.5563535781372, 144.992604457861 43.5559634287532, 144.992232714637 43.5557192069016, 144.992520557762 43.5554743029781, 144.99290224301 43.5557202536263, 144.992866882073 43.5557591814533)) ^^http://www.opengis.net/ont/geosparql#wktLiteral