# File lib/merb-core/controller/mime.rb, line 36
    def add_mime_type(key, transform_method, values, new_response_headers = {}) 
      enforce!(key => Symbol, values => Array)
      ResponderMixin::TYPES.update(key => 
        {:request_headers   => values, 
         :transform_method  => transform_method,
         :response_headers  => new_response_headers })

      Merb::RenderMixin.class_eval "def render_\#{key}(thing = nil, opts = {})\nself.content_type = :\#{key}\nrender thing, opts\nend\n", __FILE__, __LINE__
    end