メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.041328886158 43.5755382834718, 142.04093678392 43.5756774704239, 142.039904042774 43.5743319668754, 142.040193139014 43.5741676377026, 142.041328886158 43.5755382834718)) ^^http://www.opengis.net/ont/geosparql#wktLiteral