Overview of the INEX 2009 Efficiency Track

This paper presents an overview of the Efficiency Track that was run for the second time in 2009 This track is intended to provide a common forum for the evaluation of both the effectiveness and efficiency of XML ranked retrieval approaches on teal data and real queries The Efficiency Track significantly extends the Ad Hoc Track by systematically investigating different types of queries and retrieval scenarios such as classic ad hoc search high-dimensional query expansion settings and queries with a deeply nested structure (with all topics being available in both the NEXI style CO and CAS formulations as well as in their XPath 2 0 Full Text counterparts) The track received 68 runs submitted by 4 participating groups using 5 different systems The best systems achieved interactive retrieval times for ad hoc search with a result quality comparable to the best runs in the Ad Hoc track