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On the Intersection of XPath Expressions

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On the Intersection of XPath Expressions
— XPath is a common language for selecting nodes in an XML document. XPath uses so called path expressions which describe a navigation path through semistructured data. In the last years some of the characteristics of XPath have been discussed. Examples include the containment of two XPath expressions p and p (p ⊆ p ). To the best of our knowledge the intersection of two XPath expressions (p ∩ p ) has not been treated yet. The intersection of p and p is the set that contains all XML nodes that are selected both by p and p . In the context of indexes in XML databases the emptiness of the intersection of p and p is a major issue when updating the index. In order to keep the index consistent to the indexed data, it has to be detected if an index that is defined upon p is affected by a modifying database operation with the path expression p . In this paper we introduce the intersection problem for XPath and give a motivation for its relevance. We present an efficient intersection a...
Beda Christoph Hammerschmidt, Martin Kempa, Volker
Added 25 Jun 2010
Updated 25 Jun 2010
Type Conference
Year 2005
Where IDEAS
Authors Beda Christoph Hammerschmidt, Martin Kempa, Volker Linnemann
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