Get Advances in Databases and Information Systems: Third East PDF

By Günther Pernul, Alexander W. Röhm, Gaby Herrmann (auth.), Johann Eder, Ivan Rozman, Tatjana Welzer (eds.)

The third japanese eu convention on Advances in Databases and knowledge platforms (ADBIS’99) came about on 13-16- September 1999, in Maribor, Slovenia. It used to be prepared in cooperation with ACM SIGMOD, the Moscow bankruptcy of ACM SIGMOD, Slovenian Society Informatika, and the Slovenian Ministry of expertise. the purpose of the ADBIS sequence of meetings is to supply a discussion board for the alternate of clinical achievements and studies utilizing leading edge tools and techniques among the study groups of principal and jap Europe and the remainder of the area within the sector of databases and data platforms. The 1999 convention maintains the sequence of ADBIS occasions held in Moscow, St. Petersburg, and Poznan. The ADBIS guidance committee has the ambition to make the ADBIS convention the most desirable database and knowledge structures convention in primary and japanese Europe, to extend interplay and collaboration among researchers from East and West, and to supply an across the world well-known discussion board for the presentation of study and studies in all elements of recent database know-how and data structures. to accomplish those objectives a world software committee chosen 26 complete learn papers in a rigorous reviewing approach from a complete of ninety four submissions from 33 diverse international locations. This excessive variety of submissions from such a lot of diversified components indicates the really all over the world attractiveness of and curiosity within the ADBIS series.

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Extra info for Advances in Databases and Information Systems: Third East European Conference, ADBIS’99 Maribor, Slovenia, September 13–16, 1999 Proceedings

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Size()+1 illustrates this point. The keyword this denotes the receiver object in its current state. In a postcondition assertion, the object state is the state after method execution. The expression (old)this denotes the receiver object in the state prior to method execution. This form of referring to the previous object state using the keyword old is used in Eiffel [17]. Class invariants are constraints that must be satisfied by all object states outside of method execution [15]. If the proper information hiding discipline is exercised (which typically is not the case in object-oriented databases), this means that class invariants must hold for all object states visible to the clients.

Public interface Set extends Collection {public Set union(Set S); public Set intersection(Set S); ... contains(obj)); ... } A Family of the ODMG Object Models 27 Note that the methods and the constraints of the interface Collection are inherited in Set. The logic paradigm used in the above example is Horn clause logic, which is the basis for logic programming languages. The symbol <- denotes implication and comma denotes conjunction. This logic was chosen because of its well-known nice properties: well-defined formal semantics (in which the monotonicity plays a critical role), and the existence of an execution model tied to the formal semantic.

In an orthogonal model of persistence, all libraries developed without persistence considerations in mind become reusable for database applications. For example, the library of Java collection interfaces becomes readily available for database applications. Our experiments include graphic and other packages developed without any considerations of persistence in mind. The interface Collection given in section 2 is just a Java library type. DCollection is, however, an ODMG type. The implementation class for DCollection is presumably persistent capable.

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