Improved techniques for processing queries in full-text systems
SIGIR '87 Proceedings of the 10th annual international ACM SIGIR conference on Research and development in information retrieval
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Data Engineering - Non-English interfaces to databases
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ACM Transactions on Information Systems (TOIS)
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ACM Transactions on Information Systems (TOIS)
A novel method for the evaluation of Boolean query effectiveness across a wide operational range
SIGIR '00 Proceedings of the 23rd annual international ACM SIGIR conference on Research and development in information retrieval
A vector space model for automatic indexing
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Journal of the American Society for Information Science and Technology
Communications of the ACM
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CLEF '00 Revised Papers from the Workshop of Cross-Language Evaluation Forum on Cross-Language Information Retrieval and Evaluation
XIRQL: An XML query language based on information retrieval concepts
ACM Transactions on Information Systems (TOIS)
Filtering algorithms for information retrieval models with named attributes and proximity operators
Proceedings of the 27th annual international ACM SIGIR conference on Research and development in information retrieval
A search engine for natural language applications
WWW '05 Proceedings of the 14th international conference on World Wide Web
Orthogonal negation in vector spaces for modelling word-meanings and document retrieval
ACL '03 Proceedings of the 41st Annual Meeting on Association for Computational Linguistics - Volume 1
Inverted files for text search engines
ACM Computing Surveys (CSUR)
Logic and Computational Complexity for Boolean Information Retrieval
IEEE Transactions on Knowledge and Data Engineering
Processing queries with metrical constraints in XML-based IR systems
Journal of the American Society for Information Science and Technology
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ICADL'07 Proceedings of the 10th international conference on Asian digital libraries: looking back 10 years and forging new frontiers
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The negation operator, in various forms in which it appears in Information Retrieval queries, is investigated. The applications include negated terms in Boolean queries, more specifically in the presence of metrical constraints, but also negated characters used in the definition of extended keywords by means of regular expressions. Exact definitions are suggested and their usefulness is shown on several examples. Finally, some implementation issues are discussed, in particular as to the order in which the terms of long queries, with or without negated keywords, should be processed, and efficient heuristics for choosing a good order are suggested.