資料來源 : Free On-Line Dictionary of Computing

OPTRAN
     
        Specification language for attributed tree transformation
        writetn by R. Wilhelm, U Saarlandes in the early 1980's.
     
        ["POPSY and OPTRAN Manual", ESPRIT PROSPECTRA Project Item
        S.1.6-R.3.0, U Saarlandes (Mar 1986)].