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XPathMark An XPath Benchmark for XMark To devise a larger set of performance indexes for the evaluation of XML engines. To develop a benchmark to test query scalability. Query scalability is the ability of an XML engine to process queries of increasing lengths. Human-composed queries tend to be short, but computer-generated ones might be very long. This benchmark should include "crash-me queries", which are queries that seriously challenge current XML engines but that eventually might be solved efficiently. To program a benchmark checker to automatically check the benchmark on a particular XML engine. The application should also compute the performance indexes and format the evaluation outcomes in different formats (plain text, XML, HTML, Gnuplot). To develop a similar benchmark environment for XQuery.