mime_split

# File lib/rss/atom.rb, line 753
          def mime_split
            media_type = subtype = nil
            if /\A\s*([a-z]+)\/([a-z\+]+)\s*(?:;.*)?\z/ =~ @type.to_s
              media_type = $1.downcase
              subtype = $2.downcase
            end
            [media_type, subtype]
          end