def pathFromItem(self, item, avatar):
        """
        @param item: A thing that we linked to, and such.

        @return: a list of [child, grandchild, great-grandchild, ...] that
        indicates a path from me to the navigation for that item, or [] if
        there is no path from here to there.
        """
        for subnav in self.children:
            subpath = subnav.pathFromItem(item, avatar)
            if subpath:
                subpath.insert(0, self)
                return subpath
        else:
            myItem = self.loadForAvatar(avatar)
            if myItem is item:
                return [self]
        return []
@param item: A thing that we linked to, and such.

        @return: a list of [child, grandchild, great-grandchild, ...] that
        indicates a path from me to the navigation for that item, or [] if
        there is no path from here to there.