By Antoni Olivé

ISBN-10: 3540393897

ISBN-13: 9783540393894

This incredible textbook explains intimately the foundations of conceptual modeling independently from specific tools and languages and indicates how you can observe them in real-world tasks. the writer covers all facets of the engineering strategy from structural modeling over behavioral modeling to meta-modeling, and completes the presentation with an intensive case examine in response to the osCommerce procedure. Written for computing device technological know-how scholars in periods on info structures modeling in addition to for pros feeling the necessity to formalize their reviews or to replace their wisdom, Olivé provides the following a complete remedy of all points of the modeling technique. His ebook is complemented via plenty of workouts and extra on-line instructing material.

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1993). 3 Conceptual Models of Information Systems The ANSI/X3/SPARC report identified the need for a conceptual schema of databases. However, a database is only one of the components of an information system and the report was not specific about the principles and contents of the conceptual schema. As a result, in 1977 the ISO/TC97/SC5 committee created a study group with the aim of defining concepts for conceptual modeling languages. The work done by this group was reflected in a seminal report published in 1982 under the title Concepts and Terminology for the Conceptual Schema and the Information Base (Griethuysen 1982; Jardine 1984).

An internal schema for the example considered here that would be almost optimal in terms of the amount of space used (although not for other technical considerations) might be a file with the following record structure: Pieces (PieceType, Color, Row, Column) In a record, PieceType might use one character (K for king, Q for queen, R for rook, and so on), Color might use one bit (0 for white and 1 for black), and Row and Column might use a single byte (number 1…8). Internal schemas, like external ones, are defined with respect to the conceptual schema.

The only available options are to explicitly define the schema or to have it in the minds of the designers. Unfortunately, the need for conceptual schemas in the development of information systems is often overlooked or simply disregarded. The consequences are negative, both in theory and in practice. It is therefore useful to summarize the role of conceptual schemas in a simple principle called the principle of necessity: To develop an information system it is necessary to define its conceptual schema.

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Conceptual Modeling of Information Systems by Antoni Olivé


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