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OVERVIEW: CB is an experimental reasoner for ontologies based on a new kind of "consequence-based" reasoning procedure. Currently CB supports a fragment of OWL-2 which corresponds to the DL Horn-SHIF. The theory behind CB is described in the paper:  Y. Kazakov. Consequence-Driven Reasoning for Horn SHIQ Ontologies. In IJCAI, pages 2040-2045, July 11-17 2009. CONTENTS: INSTALL instructions for installation LICENSE license and copyright notice Makefile main Makefile README this file bin reasoner executables examples usage examples src program source files COPYRIGHT: All files in [src] are Copyright (c) 2009, 2010 Yevgeny Kazakov <email@example.com> and Oxford University INSTALLATION: See the file INSTALL for installation instructions. USAGE: The binaries are located in the directory [/bin]. For the usage options type from this directory: ./cb --help [on Linux & Mac] cb --help [on Windows] For usage examples see the directory [/examples] REQUIREMENTS: Currently CB can only read ontologies in OWL-2 functional-style syntax and supports a subsets of the constructors corresponding to Horn-SHIF. The reasoner will ignore any constructor or axiom type that it doesn't support and issue a warning. Classes starting with unsupported constructors will be treated as anonymous classes, which should not result in any unsound inferences. An SHIF ontology is Horn if: * It does not contain "ObjectUnionOf" positively, e.g., within a class expressions C in the following axioms and their synonyms: EquivalentClasses(C D) EquivalentClasses(D C) SubClassOf(D C) * It does not contain "ObjectComplementOf" and "ObjectAllValuesFrom" negatively, e.g., within a class expressions C in the following axioms and their synonyms: EquivalentClasses(C D) EquivalentClasses(D C) SubClassOf(C D) The reasoner will issue a warning if the ontology is not Horn. Please print ontology information to find out the reasons why ontology is not Horn: ./cb -i ontology.owl [Linux & Mac] cb -i ontology.owl [Windows] For the description of OWL-2 functional-style syntax, see: http://www.w3.org/TR/owl2-syntax/ OWL ontologies in other formats can be converted into OWL-2 functional syntax using Protege version 4.1 or higher. http://protege.stanford.edu/ To convert a file [ontology.owl], open it in Protege and save using the menu: File > Save as... > OWL Functional Syntax.