Horizontal and vertical structuring of typed graph transformation systems

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Abstract
Using a categorical semantics that has been developed recently as a basis, we study composition and refinement as horizontal and vertical structuring techniques for typed graph transformation systems. Composition of graph transformation systems with respect to common subsystems is shown to be compatible with the semantics,i.e., the semantics of the composed system is obtained as the composition of the semantics of the component systems. Moreover, the structure of a composed graph transformation system is preserved during a refinement step in the sense that compatible refinements of the components induce a refinement of the composition. The concepts and results are illustrated by a sample development of a small information system using entity relationship modelling techniques.

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