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The internet provides one with a large amount of information but the necessary information is often scattered among several sites even for the same type of data, which complicates search and analysis. This problem can be solved by creating information systems which acquire and aggregate data from the Web. The process of acquiring data can be difficult due to differences between various internet sites and the way they structure data, as well as the fact that these structures keep changing. The paper analyzes the most important practical issues that have to be dealt with when creating information systems for acquiring data from the Web.
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