Transforming constraint diagrams
BURTON, JAMES, STAPLETON, GEM and HAMIE, ALI (2009) Transforming constraint diagrams In: Proceedings of the VLL 2009 workshop on visual languages and logic as part of the 2009 IEEE symposium on visual languages and human centric computing VL/HCC 09, Corvallis, Oregon, USA, 20 September, 2009.
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Official URL: http://ceur-ws.org/Vol-510/paper4.pdf
Constraint diagrams were proposed by Kent for the purposes of formal software specification in a visual manner. They have recently been formalized and generalized, making them more expressive. This paper presents a collection of transformations that can be applied to the so called unitary α fragment of constraint diagrams. The transformations can be used to define inference rules in a more succinct manner than in earlier systems. We establish that the transformations are sufficient to transform any given unitary α-diagram into any other unitary α-diagram. Therefore, they are sufficient for formalizing any inference rules between such diagrams.
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