The member of the ``WD_ORIENTATION`` enumeration corresponding to the
        value of the ``orient`` attribute of the ``<w:pgSz>`` child element,
        or ``WD_ORIENTATION.PORTRAIT`` if not present.

def orientation(self):
        """
        The member of the ``WD_ORIENTATION`` enumeration corresponding to the
        value of the ``orient`` attribute of the ``<w:pgSz>`` child element,
        or ``WD_ORIENTATION.PORTRAIT`` if not present.
        """
        pgSz = self.pgSz
        if pgSz is None:
            return WD_ORIENTATION.PORTRAIT
        return pgSz.orient