Source : Free On-Line Dictionary of Computing

GVL
     
        Graphical View Language.  A visual language for specifying
        interactive graphical output by T.C.N. Graham & J.R. Cordy,
        Queen's University, Canada.
     
        ["GVL: A Graphical, Functional Language for the Specification
        of Output in Programming Languages", J.R. Cordy &
        T.C.N. Graham, Proc IEEE Intl Conf on Comp Lang ICCL'90 (March
        1990)].