An object-oriented temporal model
The representation of complex objects anel behaviors (state transition s) in infmmation systems is a central issue in software engineering. In an infonnation system, supported by a conventional database, the only available state is the set of present values. The object's behavior is controlled...
| Autores: | , , |
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| Tipo de recurso: | informe técnico |
| Estado: | Versión publicada |
| Fecha de publicación: | 1992 |
| País: | Brasil |
| Institución: | Universidade Federal do Rio Grande do Sul (UFRGS) |
| Repositorio: | Repositório Institucional da UFRGS |
| Idioma: | inglés |
| OAI Identifier: | oai:www.lume.ufrgs.br:10183/126669 |
| Acceso en línea: | http://hdl.handle.net/10183/126669 |
| Access Level: | acceso abierto |
| Palabra clave: | Sistemas : Informação Modelos : Dados orientados : Objetos Modelagem temporal Requirement specification Information systems Object-oriented data model Temporal modeling |
| Sumario: | The representation of complex objects anel behaviors (state transition s) in infmmation systems is a central issue in software engineering. In an infonnation system, supported by a conventional database, the only available state is the set of present values. The object's behavior is controlled by integrity constrains defining only the valid ~;tates. Almost all the representation of the dynamic evolution is lost in the traditional modeling process. In this paper the main concern is to present the extensions made on an ObjectOiiented Model, the F-ORM model [DeAntonellis 91 J to expand the representation o f the object's evolution and to support the teniporal aspects involved. Temporal object-oriented rnodels can be used to specify behavioral requirements of information systems. Four different model ing concepts are defined to represent temporal information: ( l) a set o f temporal data types anel their associated function s, to be used in properties' definitions; (2) time stamps assoei ateei to instances anel to dynamic properties; (3) a special null value for attribute values outside the validity period; and (4) temporal conditions added to rules, written in a temporal logic language. An example showing the use of the Temporal F-ORM is developed. |
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