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Semantically-Interlinked Online Communities

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Title: Semantically-Interlinked Online Communities  
Author: World Heritage Encyclopedia
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Subject: Semantic Web, FOAF (ontology), Ontology (information science), Bio-zen, Foundational Model of Anatomy
Collection: Ontology (Information Science), Semantic Web, Social Networking Services
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Semantically-Interlinked Online Communities

The SIOC project logo.

Semantically-Interlinked Online Communities Project (SIOC - pronounced "shock") is a Semantic Web technology. SIOC provides methods for interconnecting discussion methods such as blogs, forums and mailing lists to each other. It consists of the SIOC ontology, an open-standard machine readable format for expressing the information contained both explicitly and implicitly in Internet discussion methods, of SIOC metadata producers for a number of popular blogging platforms and content management systems, and of storage and browsing/searching systems for leveraging this SIOC data.

The SIOC vocabulary is based on RDF and is defined using RDFS. SIOC documents may use other existing ontologies to enrich the information described. Additional information about the creator of the post can be described using FOAF Vocabulary and the foaf:maker property. Rich content of the post (e.g., an HTML representation) can be described using the AtomOWL or RSS 1.0 Content module.

The SIOC project was started in 2004 by John Breslin and Uldis Bojars at DERI, NUI Galway. In 2007, SIOC became a W3C Member Submission.


  • Example 1
  • Implementations and applications 2
    • Creating SIOC data 2.1
    • Using SIOC data 2.2
    • SIOC utilities 2.3
  • IRC 3
  • See also 4
  • Further reading 5
  • External links 6


    Creating connections between discussion clouds with SIOC
    SIOC provides a unified vocabulary for content and interaction description: a semantic layer that can co-exist with existing discussion platforms.

Implementations and applications

Here are some of the concrete implementations and applications that produce and/or use SIOC data.

Creating SIOC data

    • SIOC Export API for PHP
    • SIOC API for Java
  • Weblog, forum and CMS exporters
    • WordPress SIOC Exporter
    • Dotclear SIOC Exporter
    • b2evolution SIOC Exporter
    • Drupal SIOC Exporter
    • phpBB 2.x SIOC Exporter
    • Triplify
    • vBulletin SIOC Exporter
  • Other exporters
    • OpenLink DataSpaces
    • TalkDigger
    • SWAML
    • Mailing List Archives
    • Mailing List Exporter
    • Twitter2RDF
    • IRC2RDF
    • Sioku (Jaiku2RDF)
    • gnizr
    • OpenQabal
    • BlogEngine.NET
    • ZYB
    • SIOC-MediaWiki exporter

Using SIOC data

  • SPARQL endpoints, querying SIOC data
    • ODS demo server and
    • #B4mad.Net SPARQL endpoint
  • Crawling SIOC data
    • SIOC Crawler
    • SIOC Browsers (1, 2)
    • Buxon
    • SIOC Explorer
  • Using SIOC for new data
    • Fishtank
    • BAETLE (Bug And Enhancement Tracking LanguagE)
    • RDFa on Rails
    • IkeWiki
    • OpenLink Virtuso AMI
    • Talis Engage
  • Reusing SIOC data
    • IKHarvester
    • and JeromeDL

SIOC utilities

  • Finding and indexing SIOC data
    • Semantic Radar


  • #sioc with experts on SIOC

See also

Further reading

  • John G. Breslin, Uldis Bojārs, Alexandre Passant, Sergio Fernández, Stefan Decker. SIOC: Content Exchange and Semantic Interoperability Between Social Networks. W3C Workshop on the Future of Social Networking, 15–16 January 2009, Barcelona, Spain.
  • Uldis Bojars, John G. Breslin, Vassilios Peristeras, Giovanni Tummarello, Stefan Decker. Interlinking the Social Web with Semantics. IEEE Intelligent Systems, Volume 23, Issue 3 (May/June 2008), pp. 29–40.
  • John G. Breslin, Andreas Harth, Uldis Bojars, Stefan Decker. Towards Semantically Interlinked Online Communities. 2nd European Semantic Web Conference, Heraklion, Greece, May 29 to June 1, 2005, pp. 500–514. LNCS 3532.
  • Andreas Harth, John G. Breslin, Ina O'Murchu, Stefan Decker. Linking Semantically-Enabled Online Community Sites. 1st Workshop on FOAF, Social Networking, and the Semantic Web, Galway, Ireland, Proceedings, September 2004.

External links

  • SIOC Project
  • SIOC Ontology Specification
  • SIOC Applications
  • SIOC Browser
  • SIOC W3C Member Submission
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