メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.341878600896 43.7677455677401, 142.342038960821 43.7680519303703, 142.342302725803 43.7685301261938, 142.340941722229 43.7689274245794, 142.340667639594 43.7684455064942, 142.340486660983 43.7681429020338, 142.340068405951 43.7673811684448, 142.339878062912 43.7669900184196, 142.341293597238 43.7666822785808, 142.341878600896 43.7677455677401)) ^^http://www.opengis.net/ont/geosparql#wktLiteral