Get the `a:hlinkClick` or `a:hlinkHover` element for the Hyperlink
        object, depending on the value of `self._hover`. Create one if not
        present.

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