W. Klas and M. Schrefl. Meta Classes and Their Applications --- Data Model Tailoring and Database Integration, volume 943 of Lecture Notes in Computer Science. Springer-Verlag, Berlin, 1995.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....Model GIM which enables an efficient algorithm to derive an integrated schema in a user friendly data model. The data model GIM was firstly introduced in [SS95, SS96a] The extensional conflict as one main conflict is topic of many publications, e.g. DH84, Mot87, MNE88, Bra93, SGN93, TS93, KS95, NS96] They usually resolve this conflict directly in an object oriented model by using specialization. The original classes are often classes of the integrated schema enriched by new super subclasses and specialization relationships among them. DS96] for example, suggests many operations to ....

W. Klas and M. Schrefl. Meta Classes and Their Applications --- Data Model Tailoring and Database Integration, volume 943 of Lecture Notes in Computer Science. Springer-Verlag, Berlin, 1995.

....reflective. Moreover, adding reflective properties to DBMSs appears to be very promising: it helps to adapt the DBMS data model, that is, the formalism in which user data and their definition (metadata) are expressed and controlled. Several studies have shown the interest of such adaptations [14]. The intercession property of many reflective systems, defined in [2] as the ability for a program to modify its own execution state or alter its own interpretation or meaning, can be applied to a DBMS, allowing the user to modify or to extend the data model. Vodak [14] and Tigukat [23] are fully ....

....of such adaptations [14] The intercession property of many reflective systems, defined in [2] as the ability for a program to modify its own execution state or alter its own interpretation or meaning, can be applied to a DBMS, allowing the user to modify or to extend the data model. Vodak [14] and Tigukat [23] are fully reflective object oriented DBMSs (OODBMS) So we believe that, in a near future, there will be growing needs of persistence management in reflective models with intercession properties. Two architectures may arise: the use of a reflective OODBMS, or the reuse of ....

W. Klas and M. Schref, Metaclasses and their Application: Data Model Tailoring and Database Integration, Lecture Notes in Computer Science n.943, Springer-Verlag, 1995.

....large knowledge base. Also Carnot relies on a single global schema to integrate the local enterprises; this means that everything has to be integrated ab initio. 4.3. 3 View Definition Facility Based Approaches The KODIM (Knowledge Oriented Distributed Information Management) project at GMD ISPI [KLA95, KLA96, KAU90] is concerned with the dynamic integration 65 of heterogeneous and autonomously administered information bases. The first prototype of this project was ViewSystem [KAU90] which depends on a query language with extensive view definition facilities to integrate a set of source schemas. ViewSystem ....

W. Klas and M. Schrefl. Meta Classes and Their Application - Data Model Tailoring and Database Integration. Springer, 1995.

....the power and the reliability of this approach, introducing the frame paradigm in class languages [2, 14] or introducing the C object model in the Clos language [15] Some object oriented databases provide an object layer owning metamodeling abilities. The works on the Adam [3] or the Vodak [6] object oriented databases show the improvement in data expressivity that a correct use of metaclasses can introduce. However these systems do not meet our requires since they are proprietor databases: they save their data neither in the odmg format nor in the relational one. We have seen that we ....

W. Klas and M. SchreAE, Metaclasses and their Application Data Model Tailoring and Database Integration, Lecture Notes in Computer Science, Vol. 943, Springer-Verlag, 1995.

....in [6] Some ob ject oriented databases have adopted such an object layer. We can cite the Adam object oriented database [3] with its meta class paradigm. Works on Adam show the improve ment in data expressivity that a correct use of meta classes can introduce. The Vodak object oriented database [8] also ooeers a well structured meta layer allowing to widely cus tomize the native object model in order to comply with new needs in expressivity. However these databases do not meet our requires, since they are iproprietorj databases: data are not saved in any standard format, neither the ....

W. Klas and M. SchreAE. Metaclasses and their appli cation Data Model Tailoring and Database Integra tion. In Lecture Notes in Computer Science, number 943. Springer-Verlag, 1995.

....Figure 2: Life cycle diagrams Object types may be organized in type hierarchies. Each object is a direct instance of exactly one object type and an indirect instance of all predecessors of its object type in the type hierarchy. We explicitly distinguish between object types and object classes [16]. Each object is a direct instance of exactly one object type, which defines its structure and behavior, and it may be a member of multiple object classes. An object class collects a set of objects which must be (direct or indirect) instances of a specific object type, the member type of the ....

W. Klas and M. Schrefl, Metaclasses and Their Application: Data Model Tailoring and Database Integration, Springer LNCS 943, 1995.

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