An XML matching engine and method are provided, where policy rules expressed using XPath/XQuery policies are matched to streaming XML documents. Two distinct data structures are used: a combined modified DFA data structure for storing simple XPath queries (no wildcards or descendents) and a modified AFilter structure for storing complex queries (with wildcards or/and descendents). As the matching engine receives XML tags from XML parser, matching is performed in both structures in parallel.

 
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