Sage: a SPARQL query engine for public Linked Data providers

Sage is a SPARQL query engine for public Linked Data providers that implements Web preemption. The SPARQL engine includes a smart Sage client and a Sage SPARQL query server hosting RDF datasets (hosted using HDT). SPARQL queries are suspended by the web server after a fixed quantum of time and resumed upon client request. Using Web preemption, Sage ensures stable response times for query execution and completeness of results under high load.

The complete approach and experimental results are available in a Research paper accepted at The Web Conference 2019, available here. Thomas Minier, Hala Skaf-Molli and Pascal Molli. "SaGe: Web Preemption for Public SPARQL Query services" in Proceedings of the 2019 World Wide Web Conference (WWW'19), San Francisco, USA, May 13-17, 2019.

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Query online Linked Data using Sage

Running in your Web Browser, powered by the Sage Javascript client

Execute SPARQL queries against any RDF datasets hosted by the Sage server, using a client-server query engine running in your browser

See the supported SPARQL 1.1 features


RDF Datasets available

Query these RDF datasets using the Java or Javascript client

Dataset Description RDF triples Time quantum Max results per HTTP request VoID description More details
dbpedia-2016-04 DBpedia dataset v2016-04 1,040,358,853 triples 75ms2000 bindings Open Open
dbpedia-2015-04en DBpedia dataset v2015-04 (english version) 398,216,004 triples 75ms2000 bindings Open Open
wikidata-2017-03-13 Wikidata 2017-03-13 release 2,262,175,283 triples 75ms2000 bindings Open Open
dbpedia-3-5-1 DBpedia v3.5.1 232,542,405 triples 75ms2000 bindings Open Open
dblp-2017 The Computer Science Bibliography (2017-01-24 release) 88,150,324 triples 75ms2000 bindings Open Open
sameAs The sameAs.cc dataset (2018 release) 558,943,116 triples 75ms2000 bindings Open Open
geonames-2012 A dataset of countries, with over 8 million placenames (2012-11-11 release) 123,020,821 triples 75ms2000 bindings Open Open
linkedgeodata-2012 OpenStreetMap as Linked Data (2012-09-10 release) 129,698,470 triples 75ms2000 bindings Open Open
swdf-2017 Semantic Web Dog Food (2017-01-23 release) 353,162 triples 75ms2000 bindings Open Open
swdf-2012 Semantic Web Dog Food (2012-11-28 release) 242,256 triples 75ms2000 bindings Open Open
eventskg-r2 A dataset of scientific events, containing historical data about the publications, submissions, start date, end date, location and homepage for top-prestigious events series. 28,329 triples 75ms2000 bindings Open Open
wiktionary-2012-en A dictionary of the English language (2012-07-21 release) 64,358,375 triples 75ms2000 bindings Open Open

Software

Query and publish RDF datasets using Sage servers using these client or server implementations.

Sage server (Python)

Publish your own datasets using the reference Sage implementation in Python. Currenlty only supports datasets in the HDT format.

Download See on Github
Sage client - Apache Jena

Based on Apache jena, this client supports the full SPARQL 1.1 syntax, including federated SPARQL queries.

Download See on Github
Sage client - Javascript

The Sage javascript client allows you to execute SPARQL 1.1 queries in any browser or using Node.js.

Download See on Github