code: def _get_or_add_hlink(self):
          
          if self._hover:
              return self._element.get_or_add_hlinkHover()
          return self._element.get_or_add_hlinkClick()
docs: Get the `a:hlinkClick` or `a:hlinkHover` element for the Hyperlink
          object, depending on the value of `self._hover`. Create one if not
          present.