((helma.objectmodel.db.Node) node).invalidateNode(childId);
((helma.objectmodel.db.Node) node).invalidateNode(childId.toString());
    public boolean jsFunction_invalidate(String childId) {        if (node instanceof helma.objectmodel.db.Node) {            if (childId == null) {                ((helma.objectmodel.db.Node) node).invalidate();            } else {                ((helma.objectmodel.db.Node) node).invalidateNode(childId);            }        }        return true;    }