(PROGRES) A very high level language based on graph grammars, developed by Andy Scheurr firstname.lastname@example.org
and Albert Zuendorf email@example.com
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 language for the graph-oriented database GRAS
, and as a rule-oriented language for prototyping nondeterministic
ally specified data/rule base transformations.
PROGRES has a formally defined semantics
based on "PROgrammed Graph Rewriting Systems". It is an almost statically typed
language which additionally offers "down casting" operators for run time checked type casting/conversion (in order to avoid severe restrictions concerning the language's expressiveness).
Version RWTH 5.10 includes an integrated environment.
[A. Scheurr, "Introduction to PROGRES, an Attribute Graph Grammar Based Specification Language", in Proc WG89 Workshop on Graphtheoretic Concepts in Computer Science", LNCS 411, Springer 1991].
(ftp://ftp.informatik.rwth-aachen.de/pub/Unix/PROGRES/) for Sun-4.