install_model

# File lib/rss/rss.rb, line 713
      def install_model(tag, uri, occurs=nil, getter=nil, plural=false)
        getter ||= tag
        if m = self::MODELS.find {|t, u, o, g, p| t == tag and u == uri}
          m[2] = occurs
        else
          self::MODELS << [tag, uri, occurs, getter, plural]
        end
      end