module tree-b {
    namespace "urn:tree-b";
    prefix tb;

    import tree-a {
        prefix ta;
    }

    augment /ta:cont {
        list list1 {
            key key1;

            leaf key1 {
                type leafref {
                    path "/ta:cont/list1/leaf1";
                }
            }

            uses ta:group1;
        }
    }
}