code: def meta(name, value, scheme=None):
      
      annotate.injectClassCallback("meta", 3, "annotate_meta",
                                   name, value, scheme=scheme)
docs: Adds meta information to a class definition.
      @param name: name of the meta data class
      @type name: str or unicode
      @param value: metadata value
      @type value: str or unicode
      @param scheme: format information about the value
      @type scheme: str or unicode or None