# File lib/edi4r/standards.rb, line 250
      def Directory.path_finder( prefix, ext, selector )
        filename = prefix + selector + '.' + ext
        searchpath = ENV['EDI_NDB_PATH']

        searchpath.split(/:/).each do |datadir|
          path = datadir + filename
          return path if File.readable? path
        end
        raise "No readable file '." + filename + "' found below any dir on '" + searchpath + "'"
      end