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The VLDB journal
Traditional information search in which queries are posed against a known and rigid schema over a structured database is shifting toward a Web scenario in which exposed schemas are vague or absent and data come from heterogeneous sources. In this framework, query answering cannot be precise and needs to be relaxed, with the goal of matching user requests with accessible data. In this paper, we propose a logical model and a class of abstract query languages as a foundation for queryingdoi:10.1007/s00778-013-0350-x fatcat:4r3fhmye6zgjdg77r7gknqaqfi