def find_id(self, element_id):
        """Find element by its id.

        Parameters
        ----------
        element_id : str
            ID of the element to find

        Returns
        -------
        FigureElement
            one of the children element with the given ID."""
        find = etree.XPath("//*[@id=$id]")
        return FigureElement(find(self.root, id=element_id)[0])
Find element by its id.

        Parameters
        ----------
        element_id : str
            ID of the element to find

        Returns
        -------
        FigureElement
            one of the children element with the given ID.