メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.08468864482 43.5390380606989, 142.084124199395 43.539000056545, 142.08419209569 43.5386070096847, 142.084362021407 43.5373715912073, 142.084955287131 43.5373078061534, 142.08486161015 43.537866115363, 142.08468864482 43.5390380606989)) ^^http://www.opengis.net/ont/geosparql#wktLiteral