メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.265317186044 44.2514317126169, 143.262508123015 44.2525940095686, 143.258067205888 44.2486436028323, 143.259560747168 44.2480752844122, 143.261912814054 44.2471802330106, 143.265317186044 44.2514317126169)) ^^http://www.opengis.net/ont/geosparql#wktLiteral