parse (Mime::Type)

    # File lib/action_controller/mime_type.rb, line 74
          def parse(accept_header)
            # keep track of creation order to keep the subsequent sort stable
            list = []
            accept_header.split(/,/).each_with_index do |header, index|
              params, q = header.split(/;\s*q=/)
              if params
                params.strip!
                list << AcceptItem.new(index, params, q) unless params.empty?
              end
            end
            list.sort!

            # Take care of the broken text/xml entry by renaming or deleting it
            text_xml = list.index("text/xml")
            app_xml = list.index(Mime::XML.to_s)

            if text_xml && app_xml
              # set the q value to the max of the two
              list[app_xml].q = [list[text_xml].q, list[app_xml].q].max

              # make sure app_xml is ahead of text_xml in the list
              if app_xml > text_xml
                list[app_xml], list[text_xml] = list[text_xml], list[app_xml]
                app_xml, text_xml = text_xml, app_xml
              end

              # delete text_xml from the list
              list.delete_at(text_xml)

            elsif text_xml
              list[text_xml].name = Mime::XML.to_s
            end

            # Look for more specific XML-based types and sort them ahead of app/xml

            if app_xml
              idx = app_xml
              app_xml_type = list[app_xml]

              while(idx < list.length)
                type = list[idx]
                break if type.q < app_xml_type.q
                if type.name =~ /\+xml$/
                  list[app_xml], list[idx] = list[idx], list[app_xml]
                  app_xml = idx
                end
                idx += 1
              end
            end

            list.map! { |i| Mime::Type.lookup(i.name) }.uniq!
            list
          end