code: def set_element_tail(parent_to_parse, element_path=None, element_tail=u''):
      
  
      return _set_element_property(parent_to_parse, element_path, _ELEM_TAIL, element_tail)
docs: Assigns the text following the parsed parent element and then returns it.
      If element_path is provided and doesn't exist, it is inserted with element_tail.
      :see: get_element(parent_to_parse, element_path)