13 Volume Editors
نویسندگان
چکیده
The W3C SPARQL working group is defining the new SPARQL 1.1query language. The current working draft of SPARQL 1.1 focuses mainly on thedescription of the language. In this paper, we provide a formalization of the syntaxand semantics of the SPARQL 1.1 federation extension, an important fragment ofthe language that has not yet received much attention. Besides, we propose opti-mization techniques for this fragment, provide an implementation of the fragmentincluding these techniques, and carry out a series of experiments that show thatour optimization procedures significantly speed up the query evaluation process.
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تاریخ انتشار 2011