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Erschienen in:
2013 | OriginalPaper | Buchkapitel
SPARQL Web-Querying Infrastructure: Ready for Action?
verfasst von : Carlos Buil-Aranda, Aidan Hogan, Jürgen Umbrich, Pierre-Yves Vandenbussche
Erschienen in: The Semantic Web – ISWC 2013
Verlag: Springer Berlin Heidelberg
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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%.