def validate_config(self):
self.roots<EOL>for child in self.ele.getchildren():<EOL><INDENT>self._validate_node(child)<EOL><DEDENT>
validate_config

        High-level api: Validate config against models. ConfigError is raised
        if the config has issues.

        Returns
        -------

        None
            There is no return of this method.

        Raises
        ------

        ConfigError
            If config contains error.