def _node_add_without_peer_list(self, node_sum, child_other):
s_node = self.device.get_schema_node(child_other)<EOL>e = deepcopy(child_other)<EOL>scope = node_sum.getchildren()<EOL>siblings = self._get_sequence(scope, child_other.tag, node_sum)<EOL>if s_node.get('<STR_LIT>') == '<STR_LIT:user>' andchild_other.get(insert_tag) is not None:<EOL><INDENT>if child_other.get(insert_tag) == '<STR_LIT>':<EOL><INDENT>if siblings:<EOL><INDENT>siblings[<NUM_LIT:0>].addprevious(self._del_attrib(e))<EOL><DEDENT>else:<EOL><INDENT>node_sum.append(self._del_attrib(e))<EOL><DEDENT><DEDENT>elif child_other.get(insert_tag) == '<STR_LIT>':<EOL><INDENT>if siblings:<EOL><INDENT>siblings[-<NUM_LIT:1>].addnext(self._del_attrib(e))<EOL><DEDENT>else:<EOL><INDENT>node_sum.append(self._del_attrib(e))<EOL><DEDENT><DEDENT>elif child_other.get(insert_tag) == '<STR_LIT>':<EOL><INDENT>if child_other.get(key_tag) is None:<EOL><INDENT>_inserterror('<STR_LIT>', self.device.get_xpath(child_other),<EOL>'<STR_LIT:key>')<EOL><DEDENT>sibling = node_sum.find(child_other.tag +<EOL>child_other.get(key_tag),<EOL>namespaces=child_other.nsmap)<EOL>if sibling is None:<EOL><INDENT>path = self.device.get_xpath(child_other)<EOL>key = child_other.get(key_tag)<EOL>_inserterror('<STR_LIT>', path, '<STR_LIT:key>', key)<EOL><DEDENT>sibling.addprevious(self._del_attrib(e))<EOL><DEDENT>elif child_other.get(insert_tag) == '<STR_LIT>':<EOL><INDENT>if child_other.get(key_tag) is None:<EOL><INDENT>_inserterror('<STR_LIT>', self.device.get_xpath(child_other),<EOL>'<STR_LIT:key>')<EOL><DEDENT>sibling = node_sum.find(child_other.tag +<EOL>child_other.get(key_tag),<EOL>namespaces=child_other.nsmap)<EOL>if sibling is None:<EOL><INDENT>path = self.device.get_xpath(child_other)<EOL>key = child_other.get(key_tag)<EOL>_inserterror('<STR_LIT>', path, '<STR_LIT:key>', key)<EOL><DEDENT>sibling.addnext(self._del_attrib(e))<EOL><DEDENT><DEDENT>else:<EOL><INDENT>if siblings:<EOL><INDENT>siblings[-<NUM_LIT:1>].addnext(self._del_attrib(e))<EOL><DEDENT>else:<EOL><INDENT>node_sum.append(self._del_attrib(e))<EOL><DEDENT><DEDENT>
_node_add_without_peer_list

        Low-level api: Apply delta child_other to node_sum when there is no peer
        of child_other can be found under node_sum. child_other is a list node.
        Element node_sum will be modified during the process.

        Parameters
        ----------

        node_sum : `Element`
            A config node in a config tree.

        child_other : `Element`
            A child of a config node in another config tree. This child has no
            peer under node_sum.

        Returns
        -------

        None
            There is no return of this method.