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Computational Linguistics
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Computational Linguistics
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Artificial Intelligence
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Extending the database relational model to capture more meaning
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ACM Transactions on Database Systems (TODS)
System R: relational approach to database management
ACM Transactions on Database Systems (TODS)
An English language question answering system for a large relational database
Communications of the ACM
Transition network grammars for natural language analysis
Communications of the ACM
Principles of Database Systems
Principles of Database Systems
Understanding Natural Language
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Null values in data base management a denotational semantics approach
SIGMOD '79 Proceedings of the 1979 ACM SIGMOD international conference on Management of data
REL: A Rapidly Extensible Language system
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ACL '82 Proceedings of the 20th annual meeting on Association for Computational Linguistics
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A personal view of natural language understanding
ACM SIGART Bulletin
Theory of Relational Databases
Theory of Relational Databases
How to not say "Nil": improving answers to failing queries in data base systems
IJCAI'79 Proceedings of the 6th international joint conference on Artificial intelligence - Volume 1
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IEEE Transactions on Knowledge and Data Engineering
KDA: A Knowledge-Based Database Assistant with a Query Guiding Facility
IEEE Transactions on Knowledge and Data Engineering
A Form-Based Natural Language Front-End to a CIM Database
IEEE Transactions on Knowledge and Data Engineering
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NLDB '00 Proceedings of the 5th International Conference on Applications of Natural Language to Information Systems-Revised Papers
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VLDB '91 Proceedings of the 17th International Conference on Very Large Data Bases
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Efficient detection of empty-result queries
VLDB '06 Proceedings of the 32nd international conference on Very large data bases
Towards portable natural language interfaces to knowledge bases - The case of the ORAKEL system
Data & Knowledge Engineering
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OTM'11 Proceedings of the 2011th Confederated international conference on On the move to meaningful internet systems - Volume Part II
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APCCM '12 Proceedings of the Eighth Asia-Pacific Conference on Conceptual Modelling - Volume 130
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An underlying relational database model and the database query language SQL are assumed, and methods are presented for responding with appropriate answers to null value responses. This is done by using a knowledge base based on RM/T, an extended relational model. The advantages of this approach are described. To demonstrate the utility of the knowledge base model, a simple knowledge base is constructed. The algorithms that provide additional information when a null answer is returned are detailed.