register

# File actionpack/lib/action_controller/mime_type.rb, line 79
      def register(string, symbol, mime_type_synonyms = [], extension_synonyms = [], skip_lookup = false)
        Mime.instance_eval { const_set symbol.to_s.upcase, Type.new(string, symbol, mime_type_synonyms) }

        SET << Mime.const_get(symbol.to_s.upcase)

        ([string] + mime_type_synonyms).each { |string| LOOKUP[string] = SET.last } unless skip_lookup
        ([symbol.to_s] + extension_synonyms).each { |ext| EXTENSION_LOOKUP[ext] = SET.last }
      end