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1 PAREO - Formal islands: foundations and applications INRIA Lorraine, LORIA - Laboratoire Lorrain de Recherche en Informatique et ses Applications

Abstract : A key feature of Model Driven Engineering is the ability to define meta-models, but also constraints that have to be satisfied by their instances. Constraints are expressed in OCL Object Constraint Language, which became a standard. OCL Constraints offer the possibility to capture properties which cannot be easily encoded in the meta-model. In the programming language community, instead of meta-models, we generally use grammars or algebraic signatures to define the syntax of the programs or abstract syntax trees AST we consider. But unfortunately, even when considering rich formalisms such as many-sorted signatures with subtyping or dependent types, they are not expressive enough to encode in a simple way some subsets of terms we want to consider. For instance arithmetic expressions which have at most two levels of plus operator, this includes a, a+b, a+b+b+c, but not a+b+c+d for instance. There is a need for a constraint language dedicated to tree based data structures such as terms and AST. In this paper we present both a language to express constraints on trees, and a compilation scheme that shows how to translate constraints into an executable formalism based on term rewriting and strategies.





Autor: François Prugniel - Pierre-Etienne Moreau - Horatiu Cirstea -

Fuente: https://hal.archives-ouvertes.fr/



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