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Erschienen in:
2013 | OriginalPaper | Buchkapitel
Approximate XML Query Processing
verfasst von : Giovanna Guerrini
Erschienen in: Advanced Query Processing
Verlag: Springer Berlin Heidelberg
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The standard XML query languages, XPath and XQuery, are built on the assumption of a regular structure with well-defined parent/child relationships between nodes and exact conditions on nodes. Full text extensions to both languages allow Information Retrieval (IR) style queries over text-rich documents. Important applications exist for which the purely textual information is not predominant and documents exhibit a structure, that is however not relatively regular. Thus, approaches to relax both content and structure conditions in queries on XML document collections and to rank results according to some measure to assess similarity have been proposed, as well as processing approaches to efficiently evaluate them. In the chapter, the various dimensions of query relaxation and alternative approaches to approximate processing will be discussed.