docs: def description_director(**kwargs):
      """Direct which class should be used based on the director
       qualifier.
      """
      description_type = {'physical': DCFormat}
      qualifier = kwargs.get('qualifier')
      # Determine the type of element needed, based on the qualifier.
      element_class = description_type.get(qualifier, DCDescription)
      # Create the element object of that element type.
      element = element_class(
          qualifier=qualifier,
          content=kwargs.get('content'),
      )
      return element