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Erschienen in:
2005 | OriginalPaper | Buchkapitel
XML & Data Streams
verfasst von : Nicolas Bruno, Luis Gravano, Nick Koudas, Divesh Srivastava
Erschienen in: Stream Data Management
Verlag: Springer US
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XQuery path queries form the basis of complex matching and processing of XML data. Most current XML query processing techniques can be divided in two groups.
Navigation-based
algorithms compute results by analyzing an input stream of documents one tag at a time. In contrast,
index-based
algorithms take advantage of (precomputed or computed-on-demand) numbering schemes over each input XML document in the stream. In this chapter, we present an index-based technique,
Index-Filter
, to answer multiple path queries.
Index-Filter
uses indexes built over the document tags to avoid processing large portions of an input document that are guaranteed not to be part of any match. We analyze
Index-Filter
, compare it against
Y-Filter
, a state-of-the-art navigation-based technique, and present the advantages of each technique.