メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.348207722453 43.7740132471217, 142.348000900755 43.7736241647614, 142.349416453285 43.7732100625053, 142.349623321363 43.7736069989152, 142.348207722453 43.7740132471217)) ^^http://www.opengis.net/ont/geosparql#wktLiteral