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Abstract: Users of information systems search frequently for database objects which fulfill a given query best in scenarios where a complete match is not feasible. Examples of such scenarios can be found in the area of content-based multimedia retrieval. Another example is a user who wants to buy a technical product of very high quality and very low price. Search conditions can be weighted differently, e.g. low price is more important than quality. Formulating such queries as well as weighting of search conditions overburdens most user. A more intuitive way for a user is to specify preferences, e.g. one product is better than another one without further explanation. In the talk I will explain how user-defined preferences and preference formulas are used to generate CQQL queries and how generated queries are evaluated against database objects. |