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Semwebbers, LODers, what PubSubHubbub can do for you (SemTech)

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Semwebbers, LODers, what PubSubHubbub can do for you (SemTech)

  1. 1. © Copyright 2010 Digital Enterprise Research Institute. All rights reserved. Digital Enterprise Research Institute www.deri.ie SemWebbers, LODers: What PubSubHubbub can do for you Alexandre Passant DERI, NUI Galway SemTech 2011 June 09 2011, San Francisco
  2. 2. Digital Enterprise Research Institute www.deri.ie Agenda   Real-time Web and Semantics   Push vs Pull   PubSubHubbub (PuSH), SemWeb and Linked Data   sparqlPuSH   SMOB   Twarql   Q/A
  3. 3. Digital Enterprise Research Institute www.deri.ie A *real-time* Web   Information is no longer static   The Social Web as an information stream (Twitter, 4sq, ...)   New trends in ubiquitous computing   Sensor data and the IoT –  Even the @towerbridge is Tweeting !   A new area for Citizen Sensing   Earthquake detection (WWW2010 paper)   Emergency management, reporting and monitoring (Mumbai attacks on Flickr, Twitter, etc.)   Opinion / trends mining (Box office prediction by HP labs) 3 of XYZ
  4. 4. Digital Enterprise Research Institute www.deri.ie Semantics and the real-time Web   Combining social stream, sensors and social data   What’s happening right now, sport-wise, 25km around here ? –  Geonames, Twitter, Dbpedia, etc.   Who in my social network, whatever the website we’re connected through, is currently in my hometown –  FOAF, Geonames, etc.   Any humidity issues in our server rooms in the US –  Sensors, Geonames, Legacy Enterprise Data, etc.   New architectures are required   Enabling pro-active notification based on triggers   Defining semantic triggers ? Yes, with SPARQL ! 4 of XYZ
  5. 5. Digital Enterprise Research Institute www.deri.ie Pull vs Push   Pull   Constant queries to various sources to get what’s new   Useless HTTP calls (API/RSS), risks of being banned (TOS), costs and maintenance 5 of XYZ Schema by M. Dabrowski, DERI
  6. 6. Digital Enterprise Research Institute www.deri.ie Pull vs Push   Push   Websites let me know when they have something relevant   Wait. Receive. Consume 6 of XYZ Schema by M. Dabrowski, DERI
  7. 7. Digital Enterprise Research Institute www.deri.ie PubSubHubbub (PuSH) at a glance   Google’s approach to enable Push on the Web   http://code.google.com/p/pubsubhubbub   Based on Atom / RSS –  link rel=“hub” header for identifying Hub from a feed   Simple registration / notification approach –  Libraries available in various languages –  Open source code for PuSH hub   Broadcasting data through public hubs –  Use Google’s one, Superfeedr, or host your own (e.g. Enterprise distribution of content) 7 of XYZ
  8. 8. Digital Enterprise Research Institute www.deri.ie PubSubHubbub, SemWeb and LOD ?   Registrations and notifications of structured data   Efficient broadcasting of structured content at Web scale   sparqlPuSH   Pro-active notifications of changes in RDF stores   Real-time monitoring using SPARQL and PuSH   SMOB   Distributed microblogging   Syncing hubs with PuSH and SPARQL 1.1 Update   Twarql   Twitter stream analysis 8 of XYZ
  9. 9. Digital Enterprise Research Institute www.deri.ie sparqlPuSH at a glance   sparqlPuSH   Combining SPARQL, SPARQL Update and PubSubHubbub for pro-active notifications of changes in RDF stores   Can be plugged on the top of any RDF store - http://code.google.com/p/sparqlpush/   Based on   SPARQL to register feeds based on query patterns   SPARQL 1.1 Update for triggers registration and detection   Atom and RSS to get feeds of related changes   PubSubHubbub for broadcasting changes 9 of XYZ
  10. 10. Digital Enterprise Research Institute www.deri.ie A 2-steps approach   A two-steps approach   Query registration   Change notification   A sparqlPuSH endpoint   Plugged on top of any RDF store (implementation-agnostic)   Registration can be done remotely, through an HTTP request sent to the sparqlPuSH endpoing   Notification is triggered as soon as relevant data appears in the store, loaded with SPARQL Update through sparqlPuSH   Clients must understand the rel=“hub” link in the feed header, and interpret notification from PuSH hubs 10 of XYZ
  11. 11. Digital Enterprise Research Institute www.deri.ie Query registration 11 of XYZ
  12. 12. Digital Enterprise Research Institute www.deri.ie Example of query registration   Identifying changes on a particular object   Be notified when something happens to ex:FooBar   Using the Changeset vocabulary by Talis 12 of XYZ
  13. 13. Digital Enterprise Research Institute www.deri.ie Query registration 13 of XYZ
  14. 14. Digital Enterprise Research Institute www.deri.ie Conventions in query registration   Using conventions to get a well-formatted Atom / RSS feed   Easier to read in standard aggregators   Mandatory elements   ?uri - their URI of the element(s) to be retrieved   ?date - their creation / modification date   Can be used to retrieve named graphs if content itself is not dated   Optional elements   ?label - their label   ?author - their author 14 of XYZ
  15. 15. Digital Enterprise Research Institute www.deri.ie Browsing available feeds   The sparqlPuSH UI   Lists available feeds, including timestamp of last update   Ability to create feeds from the interface 15 of XYZ
  16. 16. Digital Enterprise Research Institute www.deri.ie Notification 16 of XYZ
  17. 17. Digital Enterprise Research Institute www.deri.ie Notification on data update   SPARQL Update support   HTTP-Posting data to the sparqlPuSH endpoint –  Then loaded in the underlying RDF store –  Allows *real-time* identification (as opposed to cron-job)   Identifying relevant changes   Applying all registered queries to the updated dataset   Broadcasting changes   Using PubSubHubbub ! (Scalability and RT delivery) 17 of XYZ
  18. 18. Digital Enterprise Research Institute www.deri.ie Implementation   Source code (PHP)   http://code.google.com/p/sparqlpush/ (BSD license)   Server   Connection to any SPARQL endpoint   Additional connector for ARC2 using the ARC2 API   Generating RSS or Atom feeds   Demo client   Registering / unregistering queries to remote interfaces   Receiving updates from registered feeds 18 of XYZ
  19. 19. Digital Enterprise Research Institute www.deri.ie SMOB   Distributed and Semantic Microblogging   Setup your own hub, own your data, broadcast it   Fully SemWeb based (RDF backend, RDFa, LOD, etc.)   http://smob.me   SMOB and PuSH ?   Broadcasting SPARQL 1.1 Update queries (in RSS feed)   Instant notification for your followers   Ability to broadcast content deletion 19 of XYZ HTTP POST SPARQL/Update + HTTP POST Local SPARQL/Update SMOB hub at http://apassant.net SMOB hub at http://example.org http://twitter.com
  20. 20. Digital Enterprise Research Institute www.deri.ie SPARQL 1.1 Update + RSS + PuSH 20 of XYZ
  21. 21. Digital Enterprise Research Institute www.deri.ie Twarql   Twitter feeds through SPARQL   Entity extraction from Twitter feeds   Representation as Linked Data (SMOB Stack)   SPARQL queries + PuSH for notifications   Code and demos   http://wiki.knoesis.org/index.php/Twarql   http://bit.ly/twarql 21 of XYZ
  22. 22. Digital Enterprise Research Institute www.deri.ie Questions ?   Acknowledgements   Google Research Awards   Julie Anaya (SMOB + PuSH)   Pablo Mendes / Pavan Kapanipathi (Twarql)   Contact   alexandre.passant@deri.org   http://apassant.net   @terraces 22 of XYZ

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