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The use of tree transducers to compute translations between graph algebras,lgebra are powerful enough to define all series-parallel graphs, 2-trees, or related types of graphs. Tgt transducers are shown to be more powerful. These are able to compute translations into ER algebras whose operations are so-called .. operations, which are generalizations of the well-known operations to generate 2-trees.

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https://doi.org/10.1007/978-3-662-63235-2and may be seen as a kind of structured derivation. The introduced framework is independent of a particular graph transformation approach and, therefore, it may enhance the usefulness of graph transformations in many contexts.

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https://doi.org/10.1007/978-3-322-90112-5l theory of parallelism in the algebraic approach to graph grammars. Moreover, they can be the basis for the development of a more general concept of canonical derivations, and also for a generalization of the recently developed partial order and event structure semantics for graph grammars.

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