code: def set_element_text(parent_to_parse, element_path=None, element_text=u''):
      
  
      return _set_element_property(parent_to_parse, element_path, _ELEM_TEXT, element_text)
docs: Assigns a string value to the parsed parent element and then returns it.
      If element_path is provided and doesn't exist, it is inserted with element_text.
      :see: get_element(parent_to_parse, element_path)