メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.907441251789 43.4892270587812, 141.906476587794 43.4893907100635, 141.906178120331 43.4882511621148, 141.907140681418 43.4881145470709, 141.907441251789 43.4892270587812)) ^^http://www.opengis.net/ont/geosparql#wktLiteral