The CLASSIC knowledge representation system: guiding principles and implementation rationale
ACM SIGART Bulletin - Special issue on implemented knowledge representation and reasoning systems
ACM SIGART Bulletin - Special issue on implemented knowledge representation and reasoning systems
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OOPSLA '92 conference proceedings on Object-oriented programming systems, languages, and applications
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IEEE Transactions on Knowledge and Data Engineering
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ECOOP '99 Proceedings of the 13th European Conference on Object-Oriented Programming
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ACL '92 Proceedings of the 30th annual meeting on Association for Computational Linguistics
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COLING '92 Proceedings of the 14th conference on Computational linguistics - Volume 2
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AAAI'90 Proceedings of the eighth National conference on Artificial intelligence - Volume 1
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The ``Berlin advanced computational knowledge representation system'''' BACK has been developed as a KL-ONE-based hybrid reasoning system since 1985. In this report the redesign and the implemention of the system (in Prolog) are described. The overall knowledge base language is sketched, syntax and semantics are given, and the usage is illustrated by examples. It is a step towards a uniform object description language for accessing knowledge bases, combining intensional and extensional aspects - and also taking into account features known from typical database query languages. The implementational issues of the recent development are sketched; algorithms and data structures are presented, efficiency aspects are discussed, and the choices made between various implementational techniques are explained. The report is intended to serve not only as a platform for discussion on the technical issues and extensions yet to come, but also as a reference guide to the use of the current system.