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The ubiquitous adoption of XML as the standard of data exchange over the web has led to increased interest in building efficient and scalable XML publish-subscribe (pub-sub) systems. The central function of an XML-based pub-sub system is to perform XML filtering efficiently, i.e. identify those XPath expressions that have a match in a streaming XML document. In this paper, the authors propose a new sequence-based approach, which transforms both XML documents and XPath twig expressions into Node Encoded Tree Sequences (NETS). In terms of this encoding, the authors provide a necessary and sufficient condition for an XPath twig to represent a match in a given XML document.
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