メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.357920992306 43.7855617811681, 142.357306047988 43.7859910717713, 142.356692633492 43.7864474828373, 142.35503599446 43.7852597552307, 142.35569050928 43.7847727926087, 142.355723879328 43.7847479555662, 142.356199705676 43.7843939437481, 142.356281058876 43.7843334071358, 142.357920992306 43.7855617811681)) ^^http://www.opengis.net/ont/geosparql#wktLiteral