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"%3AHas-20conclusion%2FFederation-20query-20over-20SPARQL-20Endpoints-20made-20a-20significant-20progress-20in-20the-20recent-20years.-20Although-0Aa-20number-20of-20federation-20frameworks-20have-20already-20been-20developed%2C-20the-20field-20is-20still-20relatively-20far-20from-0Amaturity.-20Based-20on-20our-20experience-20with-20the-20existing-20federation-20frameworks%2C-20the-20frameworks-20mostly-0Afocus-20on-20source-20selection-20and-20join-20optimization-20during-20query-20execution.-20In-20this-20work%2C-20we-20have-20presented-20a-20list-20of-20federation-20frameworks-20over-20SPARQL-20Endpoints-20along-20with-20their-20features.-20According-20to-20this-20list%2C-20the-20user-20can-20have-20considerations-20to-20choose-20the-20suitable-20federation-20framework-20for-20their-20case.-20We-20have-20classied-20those-20framework-20into-20three-20categories%3A-20i%29-20framework-20interprets-20SPARQL-201.1-20query-20to-20execute-20federation-20SPARQL-20query-20covering-20VALUES-20and-20SERVICE-20operator-3B-20ii%29-20framework-20handles-20SPARQL-201.0-20query-20and-20has-20responsibility-20to-20find-20relevant-20source-20for-20a-20query-20and-20join-20incoming-20result-20from-20SPARQL-20Endpoints-3B-20and-20iii%29-20framework-20accepts-20SPARQL-201.0-20and-20translate-20the-20incoming-20query-20to-20SPARQL-201.1-20format.-20Based-20on-20the-20current-20generation-20of-20federation-20frameworks-20surveyed-20in-20this-20paper%2C-20it-20still-20requires-20further-20improvements-20to-20make-20frameworks-20more-20effective-20in-20a-20broader-20range-20of-20applications.-20We-20suggested-20several-20features-20that-20could-20be-20included-20in-20the-20future-20developments.-20Finally%2C-20we-20point-20out-20challenges-20for-20future-20research-20directions" contains the "%" character as part of a property label and has been classified as invalid.

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