Return a function object suitable for the "get" side of the property
        descriptor. This default getter returns the child element with
        matching tag name or |None| if not present.

def _getter(self):
        """
        Return a function object suitable for the "get" side of the property
        descriptor. This default getter returns the child element with
        matching tag name or |None| if not present.
        """
        def get_child_element(obj):
            return obj.find(qn(self._nsptagname))
        get_child_element.__doc__ = (
            '``<%s>`` child element or |None| if not present.'
            % self._nsptagname
        )
        return get_child_element