Translate a rename node into latex qtree node.
        :param node: a treebrd node
        :return: a qtree subtree rooted at the node

def rename(self, node):
        """
        Translate a rename node into latex qtree node.
        :param node: a treebrd node
        :return: a qtree subtree rooted at the node
        """
        child = self.translate(node.child)
        attributes = ''
        if node.attributes:
            attributes = '({})'.format(', '.join(node.attributes.names))
        return '[.${op}_{{{name}{attributes}}}$ {child} ]'\
            .format(op=latex_operator[node.operator], name=node.name,
                    attributes=attributes,
                    child=child)