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Pattern Queries for XML and Semistructured Data
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In: http://www.pms.informatik.uni-muenchen.de/publikationen/PMS-FB/PMS-FB-2003-1.ps.gz (2002)
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Pattern Queries for XML and Semistructured Data
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In: http://www.pms.ifi.lmu.de/publikationen/PMS-FB/PMS-FB-2003-1.pdf (2002)
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The XML Query Language Xcerpt: Design Principles, Examples, and Semantics
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In: http://www.pms.ifi.lmu.de/publikationen/PMS-FB/PMS-FB-2002-7.pdf (2002)
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Abstract:
Abstract. Most query and transformation languages developed since the mid 90es for XML and semistructured data – e.g. XQuery [1], the precursors of XQuery [2], and XSLT [3] – build upon a path-oriented node selection: A node in a data item is specified in terms of a root-to-node path in the manner of the file selection languages of operating systems. Constructs inspired from the regular expression constructs ∗, +,?, and “wildcards ” give rise to a flexible node retrieval from incompletely specified data items. This paper further introduces into Xcerpt, a query and transformation language further developing an alternative approach to querying XML and semistructured data first introduced with the language UnQL [4]. A metaphor for this approach views queries as patterns, answers as data items matching the queries. Formally, an answer to a query is defined as a simulation [5] of an instance of the query in a data item. 1
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URL: http://www.pms.ifi.lmu.de/publikationen/PMS-FB/PMS-FB-2002-7.pdf
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.72.1717
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