メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.780411178981 43.1619933613609, 140.777949258275 43.1599617224399, 140.782646667107 43.1563448917318, 140.785357299718 43.1582646275722, 140.783731669363 43.1595026792888, 140.780411178981 43.1619933613609)) ^^http://www.opengis.net/ont/geosparql#wktLiteral