New PDF release: Conceptual Modeling of Information Systems

By Antoni Olivé

ISBN-10: 3540393897

ISBN-13: 9783540393894

This marvelous textbook explains intimately the rules of conceptual modeling independently from specific equipment and languages and exhibits how you can follow them in real-world initiatives. the writer covers all points of the engineering method from structural modeling over behavioral modeling to meta-modeling, and completes the presentation with an in depth case learn in accordance with the osCommerce method. Written for desktop technology scholars in sessions on info platforms modeling in addition to for pros feeling the necessity to formalize their stories or to replace their wisdom, Olivé can provide the following a finished therapy of all facets of the modeling method. His e-book is complemented by means of plenty of routines and extra on-line educating material.

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Over time, structured analysis partially converged with conceptual models by adopting elements of structural modeling and the concept of event. 2 Semantic Data Models Database management systems started to appear during the 1960s. In the early 1970s, three data models dominated the field and competed among themselves: hierarchical, network, and relational models. All three were based on what Kent (1978) called the “record model”, which allows efficient processing of data but is far removed from the conceptual model.

In order to perform its task, the internal processor needs to know the internal schema, including its correspondence with the conceptual schema. Modern architectures of information systems are designed with three logical layers: presentation, domain, and data management. The equivalent of the external processor is located in the presentation layer, that of the information processor in the domain layer, and that of the internal processor in the data management layer. 4 Requirements Engineering In the previous section, we looked at the role of conceptual schemas in the architecture of information systems.

The internal schema is the form used internally by the system to represent the state of the domain, and the internal database is the representation of the state in that schema. Only the internal database exists physically. The internal schema also comprises the set of operations that may be invoked on the database. 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).

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Conceptual Modeling of Information Systems by Antoni Olivé


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