Full text
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| Author(s): |
Mauro Biajiz
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Instituto de Física de São Carlos (IFSC/BT) |
| Defense date: | 1996-09-03 |
| Examining board members: |
Caetano Traina Junior;
Luciano da Fontoura Costa;
Jan Frans Willem Slaets;
Fernando da Fonseca de Souza;
Asterio Kiyoshi Tanaka
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| Advisor: | Caetano Traina Junior |
| Abstract | |
A set of conceptual constructions was developed to be used as a \"conceptual tool\" aiming the representation or construction of other data models. The result is a Data Meta-Model, which can be used as a reference standard for the construction of other data models. The Meta-model is based on the identification of the fundamental data abstractions used in the existing data models. It is shown that the fundamental abstractions are the classification, the association and the generalization ones. The Meta-model permits the definition of the semantic constructors of each data model the parameterization of the fundamental abstractions used in each constructor of the model. An abstraction is parameterized by collecting its set of restrictions and by setting each restriction with a particular value. Therefore, the same abstraction can generate several distinct abstraction instances. In the same way, several abstraction instances of distinct fundamental abstractions can be associated to build each each semantic constructor of the target data model. This process is exemplified using two case studies. First, it is used to represent the Entity-Relationship Model. Thereafter, it is used to construct a new data model, aiming at supporting the requirements of computer-aided engineering design and of scientific applications. The new data model is named SIRIUS, and incorporates the fundamental abstractions instantiated into semantic constructors tailored to the needs of those domains. (AU) | |