@prefix foaf: . @prefix ns1: . @prefix ns2: . ns1:axel-cyrille-ngonga-ngomo foaf:made ns2:journal-6 . ns1:ivan-ermilov foaf:made ns2:journal-6 . ns1:muhammad-saleem foaf:made ns2:journal-6 . @prefix rdf: . @prefix ns4: . ns2:journal-6 rdf:type ns4:InProceedings . @prefix rdfs: . ns2:journal-6 rdf:type rdfs:Resource . @prefix owl: . ns2:journal-6 rdf:type owl:Thing ; rdfs:label "A Fine-Grained Evaluation of SPARQL Endpoint Federation Systems" . @prefix ns7: . ns2:journal-6 owl:sameAs ns7:journal-6 . @prefix dc: . ns2:journal-6 dc:creator ns1:axel-cyrille-ngonga-ngomo , ns1:yasar-khan , ns1:syed-muhammad-ali-hasnain , ns1:muhammad-saleem , ns1:ivan-ermilov ; foaf:maker ns1:syed-muhammad-ali-hasnain , ns1:yasar-khan , ns1:axel-cyrille-ngonga-ngomo , ns1:muhammad-saleem , ns1:ivan-ermilov ; ns4:abstract "The Web of Data has grown enormously over the last years. Currently, it comprises a large compendium of interlinked and distributed datasets from multiple domains. Running complex queries on this compendium often requires accessing data from different endpoints within one query. The abundance of datasets and the need for running complex query has thus motivated a considerable body of work on SPARQL query federation systems, the dedicated means to access data distributed over the Web of Data. However, the granularity of previous evaluations of such systems has not allowed deriving of insights concerning their behavior in different steps involved during federated query processing. In this work, we perform extensive experiments to compare state-of-the-art SPARQL endpoint federation systems using the comprehensive performance evaluation framework FedBench. In addition to considering the tradition query runtime as an evaluation criterion, we extend the scope of our performance evaluation by considering criteria, which have not been paid much attention to in previous studies. In particular, we consider the number of sources selected, the total number of SPARQL ASK requests used, the completeness of answers as well as the source selection time. Yet, we show that they have a significant impact on the overall query runtime of existing systems. Moreover, we extend FedBench to mirror a highly distributed data environment and assess the behavior of existing systems by using the same performance criteria. As the result we provide a detailed analysis of the experimental outcomes that reveal novel insights for improving current and future SPARQL federation systems." . @prefix ns9: . ns2:journal-6 ns4:hasAuthorList ns9:authorList . @prefix ns10: . ns2:journal-6 ns4:isPartOf ns10:proceedings . @prefix xsd: . ns2:journal-6 ns4:keyword "Web of Data"^^xsd:string , "SPARQL federation"^^xsd:string , "RDF"^^xsd:string ; ns4:title "A Fine-Grained Evaluation of SPARQL Endpoint Federation Systems" . ns1:syed-muhammad-ali-hasnain foaf:made ns2:journal-6 . ns1:yasar-khan foaf:made ns2:journal-6 . ns10:proceedings ns4:hasPart ns2:journal-6 .