Advanced Query Processing pp 129-155

Part of the Intelligent Systems Reference Library book series (ISRL, volume 36) | Cite as

Approximate XML Query Processing

Abstract

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.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Università di GenovaGenovaItaly

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