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This book constitutes the refereed proceedings of the 28th International Conference on Conceptual Modeling, ER 2009, held in Gramado, Brazil, in November 2009. The 31 revised full papers presented together with 18 demo papers were carefully reviewed and selected from 162 submissions. The papers are organized in topical sections on conceptual modeling, requirements engineering, query approaches, space and time modeling, schema matching and integration, application contexts, process and service modeling, and industrial session.

Database design --- Relational databases --- Computer Science --- Engineering & Applied Sciences --- Information Technology --- Software Engineering --- Computer science. --- Software engineering. --- Computer programming. --- Data structures (Computer science). --- Computers. --- Computer Science. --- Software Engineering/Programming and Operating Systems. --- Theory of Computation. --- Programming Techniques. --- Software Engineering. --- Models and Principles. --- Data Structures. --- Automatic computers --- Automatic data processors --- Computer hardware --- Computing machines (Computers) --- Electronic brains --- Electronic calculating-machines --- Electronic computers --- Hardware, Computer --- Computer systems --- Cybernetics --- Machine theory --- Calculators --- Cyberspace --- Information structures (Computer science) --- Structures, Data (Computer science) --- Structures, Information (Computer science) --- Electronic data processing --- File organization (Computer science) --- Abstract data types (Computer science) --- Computers --- Electronic computer programming --- Electronic digital computers --- Programming (Electronic computers) --- Coding theory --- Computer software engineering --- Engineering --- Informatics --- Science --- Programming --- Information theory. --- Data structures (Computer scienc. --- Communication theory --- Communication