def opt_element(self, qualifiedName):
        """
        Specify the LiveElement or LiveFragment class to serve.
        """
        try:
            factory = namedAny(qualifiedName)
        except (__HOLE__, AttributeError):
            raise UsageError("Specify a valid class name to --element")
        self['element'] = factory
dataset/ETHPy150Open twisted/nevow/nevow/_widget_plugin.py/Options.opt_element