メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.395818819334 44.1797042841851, 142.394328961245 44.1794625184333, 142.394534553617 44.1788163003065, 142.396020195352 44.1790536208928, 142.395818819334 44.1797042841851)) ^^http://www.opengis.net/ont/geosparql#wktLiteral