Parse the element from the given parent element.

def parse_from_parent(
            self,
            parent,  # type: ET.Element
            state  # type: _ProcessorState
    ):
        # type: (...) -> Any
        """Parse the element from the given parent element."""
        xml_value = self._processor.parse_from_parent(parent, state)
        return _hooks_apply_after_parse(self._hooks, state, xml_value)