TY - GEN
T1 - SPARQL web-querying infrastructure
T2 - 12th International Semantic Web Conference, ISWC 2013
AU - Buil-Aranda, Carlos
AU - Hogan, Aidan
AU - Umbrich, Jürgen
AU - Vandenbussche, Pierre Yves
PY - 2013
Y1 - 2013
N2 - Hundreds of public SPARQL endpoints have been deployed on the Web, forming a novel decentralised infrastructure for querying billions of structured facts from a variety of sources on a plethora of topics. But is this infrastructure mature enough to support applications? For 427 public SPARQL endpoints registered on the DataHub, we conduct various experiments to test their maturity. Regarding discoverability, we find that only one-third of endpoints make descriptive meta-data available, making it difficult to locate or learn about their content and capabilities. Regarding interoperability, we find patchy support for established SPARQL features like ORDER BY as well as (understandably) for new SPARQL 1.1 features. Regarding efficiency, we show that the performance of endpoints for generic queries can vary by up to 3-4 orders of magnitude. Regarding availability, based on a 27-month long monitoring experiment, we show that only 32.2% of public endpoints can be expected to have (monthly) "two-nines" uptimes of 99-100%.
AB - Hundreds of public SPARQL endpoints have been deployed on the Web, forming a novel decentralised infrastructure for querying billions of structured facts from a variety of sources on a plethora of topics. But is this infrastructure mature enough to support applications? For 427 public SPARQL endpoints registered on the DataHub, we conduct various experiments to test their maturity. Regarding discoverability, we find that only one-third of endpoints make descriptive meta-data available, making it difficult to locate or learn about their content and capabilities. Regarding interoperability, we find patchy support for established SPARQL features like ORDER BY as well as (understandably) for new SPARQL 1.1 features. Regarding efficiency, we show that the performance of endpoints for generic queries can vary by up to 3-4 orders of magnitude. Regarding availability, based on a 27-month long monitoring experiment, we show that only 32.2% of public endpoints can be expected to have (monthly) "two-nines" uptimes of 99-100%.
UR - http://www.scopus.com/inward/record.url?scp=84891943229&partnerID=8YFLogxK
U2 - 10.1007/978-3-642-41338-4_18
DO - 10.1007/978-3-642-41338-4_18
M3 - Contribución a la conferencia
AN - SCOPUS:84891943229
SN - 9783642413377
T3 - Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
SP - 277
EP - 293
BT - The Semantic Web, ISWC 2013 - 12th International Semantic Web Conference, Proceedings
Y2 - 21 October 2013 through 25 October 2013
ER -