Abstract
The LOGIDATA+ data model is presented. It is value-based, object-based, and functional at the same: it involves classes (with object-identity), relations (value based), and functions. Classes can be referred to in relations and functions. Is-a relationships can be defined on classes. Complex values can be built by means of the recursive use of set, tuple, and sequence constructors. As usual in database frameworks, the model has an intensional level (with the notion of scheme) and an extensional level, (with the notion of instance). A data definition language for the description of LOGIDATA+ schemes is also presented.
Work supported by CNR, “Progetto Finalizzato Sistemi Informatici e Calcolo Parallelo.” The first author is now with Terza Università di Roma.
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© 1993 Springer-Verlag Berlin Heidelberg
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Atzeni, P., Cacace, F., Ceri, S., Tanca, L. (1993). The LOGIDATA+ model. In: Atzeni, P. (eds) LOGIDATA+: Deductive Databases with Complex Objects. Lecture Notes in Computer Science, vol 701. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0021887
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DOI: https://doi.org/10.1007/BFb0021887
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