--------------------------------------- file 1 Tag Ref Name --------------------------------------- 1965 2 g0 1965 3 g0/g1 1965 4 g0/g1/g1.1 --------------------------------------- file 2 Tag Ref Name --------------------------------------- 1965 2 g0 1965 3 g0/g1 1965 4 g0/g1/g1.1 --------------------------------------- file1 file2 --------------------------------------- x x g0 x x g0/g1 x x g0/g1/g1.1