
UML 2001 - The Unified Modeling Language. Modeling Languages, Concepts, and Tools
Martin Gogolla, Cris Kobryn
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Fundamentals and Pragmatics
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This text presents a comprehensive introduction to an extended Entity-Relationship model both on a conceptual and on a formal, mathematicallevel. In addition to the primitives given by the data model the text introduces a language for the formulation of constraints in order to restrict database states to consistent ones.
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