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This software product implements a prototype of the query engine representing the core of the personalization framework for multi-version XML repositories described in the paper "Efficient management of multi-version clinical guidelines" (doi:10.1016/j.jbi.2012.07.005, U-GOV ID: 132133) and used for performance evaluation of the proposed personalization approach. The query engine, implementing optimized combinations of various solutions based on a holistic technology for effecting multi-version slicing of XML documents according to both temporal and semantic user-defined constraints, has been developed using Java JDK 1.6 and ad hoc data structures. With respect to the version used for the experimental part of the work "Efficient management of multi-version clinical guidelines", in the current version of the prototype, management of accessory data structures for the application of semantics aspects has been improved. The prototype is running on an Intel Core2 Duo 2.4 Ghz OSX workstation, equipped with 2 GB RAM and a 160 GB SATA disk, located at the University of Modena and Reggio Emilia.