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Title:
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Transformación de restricciones de integridad dinámicas definidas hacia el futuro en una forma definida hacia el pasado
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Author:
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Pacheco Silva, María Amelia; Sancho Samsó, María Ribera
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Other authors:
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Universitat Politècnica de Catalunya. Departament d'Enginyeria de Serveis i Sistemes d'Informació; Universitat Politècnica de Catalunya. MPI - Modelització i Processament de la Informació |
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Abstract:
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Dynamic integrity constraints (DIC) have been represented either as
past-directed formulas or as future-directed formulas. This work,
inscribed in
the scope of the Deductive Conceptual Models of information systems, is an
effort to prove the equivalence of these two kinds of formulas. Our work
proposes a method that transforms any DIC specified through a future-directed
formula into an equivalent past-directed formula. This method deals with the
integrity constraints defined by a first-order logic language with explicit
time that have the form of a denial. The method is based on the construction
of time graphs to represent the temporal sequence of the facts presented in
a formula. The first step consists in representing the initial formula defined
in future tense by means of a time graph. Next a new time graph in a reverse
temporal interpretation is constructed. Finally starting from this new graph
the method generates a past-directed formula to represent the initial
integrity constraint. |
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Subject(s):
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-Àrees temàtiques de la UPC::Informàtica::Sistemes d'informació
-Dynamic integrity constraints
-DIC
-Deductive conceptual models
-Information systems |
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Rights:
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Document type:
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Article - Published version
Report |
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