メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.995271995424 37.7256376838326, 138.994073365753 37.7259963663478, 138.993940744785 37.7256011639062, 138.993848498343 37.725193824695, 138.993818981243 37.7248108623067, 138.995176775315 37.7247361886057, 138.995162672732 37.7248545104633, 138.995258785578 37.7255967703229, 138.995271995424 37.7256376838326)) ^^http://www.opengis.net/ont/geosparql#wktLiteral