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P9415   S.F.M. van Vlijmen, P.N. Vriend & A. van Waveren
        "Control and data transfer in the distributed editor of the ASF+SDF
        meta-environment"


For the ASF+SDF Meta-environment [K93] a new editor that combines text and
structure editing was designed and implemented [BK93] [Koo94]. The new
editor is not a monolithic piece of software, as the previous editor was,
but constructed from three interacting components: a user-interface, a text
editor, and a structure editor. During the implementation of the editor it
turned out that the interaction between the user and the editor components
themselves was more complex than expected. In this paper an approach is
presented to model the interactions between components. Following this
approach, a specification of the editor, with emphasis on the most
important interactions, is given in PSF [MV89, MV90, M91] and in
Synchronous Interworkings [MWW92]. In conclusion, these efforts helped in
finding a simple and reliable implementation of the interactions.


[K93]	P. Klint. A meta-environment for generating programming
        environments. In ACM Transactions on Software Engineering and
        Methodology, 2(2): 176-201, 1993.

[BK93]	H.C.N. Bakker and J.W.C. Koorn. Builing an Editor from Existing
        Components: an Exercise in Software Re-use. Report P9312,
        Programming Research Group, University of Amsterdam, 1993.

[Koo94]	J.W.C. Koorn. Generating uniform user-interfaces for interactive
        programming environments. PhD. Thesis, University of Amsterdam,
        1994.

[MV89]	S. Mauw and G.J. Veltink. An introduction to PSFd. In J. Diaz,
        F. Orejas eds. Proc. International Joint Conference on Theory and
        Practice of Software Development, TAPSOFT '89, LNCS 352,
        pp. 272-285, Springer Verlag, 1989.

[MV90]	S. Mauw and G.J. Veltink. A process specification formalism.
        Fundamentae Informaticae XIII, pp. 85-139, 1990.

[M91]	S. Mauw. PSF, a process specification formalism. PhD. Thesis,
        University of Amsterdam 1991.

[MWW92]	S. Mauw, M. van Wijk, and T. Winter. Syntax and Semantics of
        Synchronous Interworkings. Philips Research RWB508RE922436, 1992.