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Lecture Notes in Computer Science
UML is the de-facto standard language for Object-Oriented analysis and design of information systems. Persistent storage and extraction of data in such systems is supported by databases and query languages. UML sustains many aspects of software engineering; however, it does not provide explicit facility for writing queries. It is crucial for any such query language to have, at least, the expressive power of Relational Algebra, which serves as a benchmark for evaluating its expressiveness. Thedoi:10.1007/3-540-45441-1_8 fatcat:ncinnytpnzbd7enceiuq6t7uf4