def find_id(self, element_id):
find = etree.XPath("<STR_LIT>")<EOL>return FigureElement(find(self.root, id=element_id)[<NUM_LIT:0>])<EOL>
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.