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programmed graph rewriting systems : FOLDOC | PROgrammed Graph REwriting Systems (PROGRES) A very high level language based on {graph grammars}, developed by Andy Scheurr and Albert Zuendorf of {RWTH}, Aachen in 1991. PROGRES supports structurally {object-oriented specification} of {attributed graph} structures with multiple inheritance hierarchies and types of types (for parametric polymorphism). It also supports declarative/relational specification of derived attributes, node sets, binary relationships (directed edges) and Boolean constraints, rule-oriented/visual specification of parameterised graph rewrite rules with complex application conditions, nondeterministic and imperative programming of composite graph transformations (with built-in backtracking and cancelling arbitrary sequences of failing graph modifications). It is used for implementing abstract data types with graph-like internal structure, as a visual lan
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