Loads all or part of the specified *config* to the *target* configuration datastore.

        *target* is the name of the configuration datastore being edited

        *config* is the configuration, which must be rooted in the `config` element. It can be specified either as a string or an :class:`~xml.etree.ElementTree.Element`.

        *default_operation* if specified must be one of { `"merge"`, `"replace"`, or `"none"` }

        *test_option* if specified must be one of { `"test_then_set"`, `"set"` }

        *error_option* if specified must be one of { `"stop-on-error"`, `"continue-on-error"`, `"rollback-on-error"` }

        The `"rollback-on-error"` *error_option* depends on the `:rollback-on-error` capability.

def request(self, config, format='xml', target='candidate', default_operation=None,
            test_option=None, error_option=None):
        """Loads all or part of the specified *config* to the *target* configuration datastore.

        *target* is the name of the configuration datastore being edited

        *config* is the configuration, which must be rooted in the `config` element. It can be specified either as a string or an :class:`~xml.etree.ElementTree.Element`.

        *default_operation* if specified must be one of { `"merge"`, `"replace"`, or `"none"` }

        *test_option* if specified must be one of { `"test_then_set"`, `"set"` }

        *error_option* if specified must be one of { `"stop-on-error"`, `"continue-on-error"`, `"rollback-on-error"` }

        The `"rollback-on-error"` *error_option* depends on the `:rollback-on-error` capability.
        """
        node = new_ele("edit-config")
        node.append(util.datastore_or_url("target", target, self._assert))
        if error_option is not None:
            if error_option == "rollback-on-error":
                self._assert(":rollback-on-error")
            sub_ele(node, "error-option").text = error_option
        if test_option is not None:
            self._assert(':validate')
            sub_ele(node, "test-option").text = test_option
        if default_operation is not None:
        # TODO: check if it is a valid default-operation
            sub_ele(node, "default-operation").text = default_operation
# <<<<<<< HEAD
#         node.append(validated_element(config, ("config", qualify("config"))))
# =======
        if format == 'xml':
            node.append(validated_element(config, ("config", qualify("config"))))
        if format == 'text':
            config_text = sub_ele(node, "config-text")
            sub_ele(config_text, "configuration-text").text = config
# >>>>>>> juniper
        return self._request(node)