By Paolo Atzeni (auth.), Paolo Atzeni (eds.)
ISBN-10: 354056974X
ISBN-13: 9783540569749
This booklet offers a set of coordinated clinical papers describing the paintings carried out and the consequences completed in the LOGIDATA+ undertaking, a study motion funded via the Italian nationwide examine council CNR. Theaim of the LOGIDATA+ undertaking is the definition of complex database platforms which considerably expand the functionalities of the present platforms, with particular connection with the applying parts for which relational systemsare no longer thought of passable. those new structures will enable the definitionof facts with advanced constructions, the illustration of semantic relationships among items, and using robust question and replace languages. they are going to be in keeping with a mixture of innovations originatingfrom relational databases and good judgment programming, with contributions from object-oriented programming. The target of the LOGIDATA+ undertaking is the layout, definition, and prototype implementation of a database administration process with advanced constructions and a category hierarchy, to be accessed via a rule-based language. This ebook provides an built-in view of the undertaking on the finish of the 1st part. the second one section might be commonly thinking about the implementation of prototypes.
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Additional resources for LOGIDATA+: Deductive Databases with Complex Objects
Example text
E. relations with no oid's). This is the reason why the specifications are modeled by means of the relation s p e c , that has a value key i d . 48 In the following sections we will often resort to the "dot" operator, applied not only to tuples, as defined in [5], but also to oid's. Given a variable X that represents an oid of a class c, and an attribute A appearing in the type of C, the term X. A refers to the value of the attribute A in the object associated to the old corresponding to X. The program realizes an input-output transformation - with the output scheme obtained from the input one along with the program type declarations - through the use of a set of intermediate transformations.
Computer Science Press, Potomac, Maryland, 1989. 15. D. Ullman. Principles of Database and Knowledge Base Systems, volume 1. Computer Science Press, Potomac, Maryland, 1988. Travel Agency: A LOGIDATA + Application L u c a C a b i b b o and Giansalvatore M e c c a Dipartimento di Informatica e Sistemistiea, Universit/t di Roma "La Sapienza" Via Salaria 113, 00198 Roma, Italy Abstract. Expressive power and flexibility of the LOGIDATA+ model and language are explored. We analyze a program for travel agencies: the problem we consider is concerned with the construction of travels on the basis of the client's specifications.
The L O G I D A T A + language, presented in [5], is a declarative language capable of handling complex structures and objects. It is a suitable extension of ordinary declarative languages, such as Datalog [9], that allows for: 9 creation and management of oid's, through the notion of oid invention; * grouping constructs used as set constructors for multivalued functions; 9 built-in predicates and functions; 43 9 negation in the body of rules. The semantics proposed is deterministic and stratified with respect to negated atoms and multivalued functions.
LOGIDATA+: Deductive Databases with Complex Objects by Paolo Atzeni (auth.), Paolo Atzeni (eds.)
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