f-SPARQL: a flexible extension of SPARQL

Authors:
Jingwei Cheng;Z. M. Ma;Li Yan
Affiliations:
Northeastern University, Shenyang, China;Northeastern University, Shenyang, China;Northeastern University, Shenyang, China
Venue:
DEXA'10 Proceedings of the 21st international conference on Database and expert systems applications: Part I
Year:
2010

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Abstract

We propose an flexible extension of SPARQL by introducing fuzzy set theory and the α-cut operation of fuzzy numbers into SPARQL. We show how to efficiently compute the top-k answers of flexible SPARQL queries with regard to membership degrees and user-defined weights. Based on our method, a flexible query service is implemented and evaluated on the LUBM platform. Results of a preliminary user study demonstrate that the method for construction and translation of flexible queries and results ranking can capture the users's intension effectively.