Parse the array data from the provided parent XML element.

def parse_from_parent(
            self,
            parent,  # type: ET.Element
            state  # type: _ProcessorState
    ):
        # type: (...) -> Any
        """Parse the array data from the provided parent XML element."""
        item_iter = parent.findall(self._item_path)
        return self._parse(item_iter, state)