メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.989592804132 43.5638463228869, 144.988908148805 43.5644517262816, 144.98843524656 43.5637349171295, 144.98838549507 43.5636315471371, 144.988703572804 43.5634082191592, 144.988782294408 43.5633401277724, 144.989592804132 43.5638463228869)) ^^http://www.opengis.net/ont/geosparql#wktLiteral