HermiT is a conformant OWL 2 DL reasoner that uses the direct semantics. It supports all OWL2 DL constructs and the datatypes required by the OWL 2 specification. HermiT is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. HermiT is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. Copies of the GNU General Public License and the GNU Lesser General Public License have been included with this distribution in the file `gpl.txt` and lgpl-3.0.txt, respectively. An online version is available at . More information about HermiT and additional licensing information is available at , or by contacting Boris Motik or Ian Horrocks at the Oxford University Computing Laboratory. HermiT uses the following libraries in unmodified form: 1) dk.brics.automaton, Copyright (C) 2001-2009 Anders Moeller http://www.brics.dk/automaton/ released under BSD license, see dk.brics.automaton.COPYING and dk.brics.automaton.README in project/lib or in the Protege plug-in jar file 2) JAutomata, http://jautomata.sourceforge.net/ released under LGPL 2.1, see jautomata.LICENSE in project/lib or in the Protege plug-in jar file 3) The OWL API, http://owlapi.sourceforge.net released under LGPL 3.0, see owlapi.LICENSE in project/lib or in the Protege plug-in jar file 4) Apache Axiom, http://ws.apache.org/commons/axiom/ released under The Apache Software License, Version 2.0, see axiom-1.2.8.LICENSE in project/lib or in the Protege plug-in jar file 5) Apache Commons Logging, http://commons.apache.org/logging/ released under The Apache Software License, Version 2.0, see commons-logging.LICENSE in project/lib or in the Protege plug-in jar file The release is organised as follows: HermiT.jar is a stand-alone version of HermiT that can be used from the command line or from within other Java programs. It contains all required libraries. org.semanticweb.HermiT.jar is a plug-in for Protege version 4.1. It can be copied into the plugins folder of Protege. project/* is the Java Eclipse project for HermiT. It contains all sources (folders src, test, examples, and getopt) and libraries (folder lib) incl. sources and can directly be imported into Eclipse. HermiT 1.0 - supports all of OWL 2 HermiT 1.1 - supports DL-safe SWRL rules HermiT 1.2 - contains a novel blocking strategy - minor bug fixes (nominals and equality statements in the ABox were not handled correctly in some case) HermiT 1.2.1 - minor bug fixes (nominals and equality statements in the ABox were still not handled correctly if the ontology was nondeterministic, custom data ranges were not loaded correctly in some case) HermiT 1.2.2 - minor bug fixes (complex concept queries didn't work properly in the presence of role chains and transitivity), added a progress monitor for realisation that is used by Protege