Abstract
Hierarchical graph transformation as defined in [1,2] extends double-pushout graph transformation in the spirit of term rewriting: Graphs are provided with hierarchical structure, and transformation rules are equipped with graph variables. In this paper we analyze conditions under which diverging transformation steps \(H \Leftarrow G \Rightarrow H'\) can be joined by subsequent transformation sequences \(H \stackrel *{\Rightarrow} M \stackrel *{\Leftarrow} H'\). Conditions for joinability have been found for graph transformation (called parallel independence) and for term rewriting (known as non-critical overlap). Both conditions carry over to hierarchical graph transformation. Moreover, the more general structure of hierarchical graphs and of transformation rules leads to a refined condition, termed fragmented parallel independence, which subsumes both parallel independence and non-critical overlap as special cases.
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Habel, A., Hoffmann, B. (2004). Parallel Independence in Hierarchical Graph Transformation. In: Ehrig, H., Engels, G., Parisi-Presicce, F., Rozenberg, G. (eds) Graph Transformations. ICGT 2004. Lecture Notes in Computer Science, vol 3256. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-30203-2_14
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DOI: https://doi.org/10.1007/978-3-540-30203-2_14
Publisher Name: Springer, Berlin, Heidelberg
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