def move(self, target, pos=None):
        """
        Moves the current node and all it's descendants to a new position
        relative to another node.
        """

        pos = self._prepare_pos_var_for_move(pos)

        sib_order = None
        parent = None

        if pos in ('first-child', 'last-child', 'sorted-child'):
            # moving to a child
            if not target.is_leaf():
                target = target.get_last_child()
                pos = {'first-child': 'first-sibling',
                       'last-child': 'last-sibling',
                       'sorted-child': 'sorted-sibling'}[pos]
            else:
                parent = target
                if pos == 'sorted-child':
                    pos = 'sorted-sibling'
                else:
                    pos = 'first-sibling'
                    sib_order = 1

        if target.is_descendant_of(self):
            raise InvalidMoveToDescendant(
                _("Can't move node to a descendant."))

        if self == target and (
            (pos == 'left') or
            (pos in ('right', 'last-sibling') and
             target == target.get_last_sibling()) or
            (pos == 'first-sibling' and
             target == target.get_first_sibling())):
            # special cases, not actually moving the node so no need to UPDATE
            return

        if pos == 'sorted-sibling':
            if parent:
                self.parent = parent
            else:
                self.parent = target.parent
        else:
            if sib_order:
                self.sib_order = sib_order
            else:
                self.sib_order = self.__class__._get_new_sibling_order(pos,
                                                                       target)
            if parent:
                self.parent = parent
            else:
                self.parent = target.parent

        self.save()
Moves the current node and all it's descendants to a new position
        relative to another node.