# File lib/numru/nusdas.rb, line 507
      def new(file, vname)
        raise(ArgumentError, "file must be NuSDaS") unless NuSDaS === file
        raise(ArgumentError, "file must be NuSDaS") unless String === vname
        type1, type2, type3, basetime, element = vname.split("/")
        basetime = NuSDaS.time_from_str(basetime)
        file.var(type1, type2, type3, basetime, element)
      end