# File lib/dnstraverse/message_utility.rb, line 176
    def msg_cacheable(msg, bailiwick, type = :both)
      good, bad = Array.new, Array.new
      bw = bailiwick.to_s
      bwend = "." + bw
      for section in [:additional, :authority] do
        for rr in msg.send(section) do
          name = rr.name.to_s
          if bailiwick.nil? or name.casecmp(bw) == 0 or
            name =~ /#{bwend}$/i then
            good.push rr
          else
            bad.push rr
          end
        end
      end
      good.map {|x| Log.debug { "Records within bailiwick: " + x.to_s } }
      bad.map {|x| Log.debug { "Records outside bailiwick: " + x.to_s } }
      return good if type == :good
      return bad if type == :bad
      return good, bad
    end