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Weaving SIOC into the Web of Linked Data

Weaving SIOC into the Web of Linked Data

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Weaving SIOC into the Web of Linked Data

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  1. Weaving SIOC into the Web of Linked Data Uldis Bojārs1, Alexandre Passant2, Richard, Cyganiak1, John Breslin1 1 Digital Enterprise Research Institute, National University of Ireland, Galway 2 LaLIC, Université Paris-Sorbonne / Electricité de France R&D

  2. SIOC Overview • SIOC - Semantically-Interlinked Online Communities • SIOC is a standard way for expressing information on online community sites in a rich, machine-readable form. • W3C Member Submission – June 2007 • http://www.w3.org/Submission/2007/02/ • Academic and Industrial Partners • 3 documents • SIOC Core Ontology Specification • SIOC Ontology: Applications and Implementation Status • SIOC Ontology: Related Ontologies and RDF Vocabularies

  3. The SIOC Core Ontology SIOC Ontology Specification http://rdfs.org/sioc/spec/

  4. SIOC data producers • SIOC applications list: • http://rdfs.org/sioc/applications/ • >20 applications for producing SIOC data: • Free and open source • SIOC export tools for: • Blogs and forums: WordPress, phpBB, Drupal, b2evolution • “Legacy” applications: mailing lists, IRC • New media: Twitter, Jaiku, Facebook, Flickr • Enterprise applications: CWE (collaborative work environments)

  5. SIOC RDF Browser http://sparql.captsolo.net/browser

  6. The SIOC food chain ~50 applications for working with SIOC data (producing, finding, consuming, …) listed at http://rdfs.org/sioc/applications/

  7. SIOC Tutorial @ WWW’08 • Look here for more information about the SIOC Project <> rdfs:seeAlso <http://url.ie/bwk> . • SIOC Project homepage • http://sioc-project.org/ • This presentation concentrates on SIOC as a citizen of the Linked Data Universe

  8. Firsts steps towards Linked SIOC Data • Exporters create interlinked SIOC data • Using rdfs:seeAlso links or dereferencable URIs • E.g. RDF document describing a sioc:Post links to a document describing the User that created it, … • Yet, this can still be viewed as « walled garden »

  9. Interlinking users and content inside a community • The sioc:Site instance provide a unique entry point for the whole RDF data • Site links to Posts; Posts link toComments & Users; … • All SIOC RDF pages arelinked together starting from the top of the tree • Useful to crawl SIOC data

  10. Interlinking SIOC and FOAF data • FOAF – Friend Of A Friend • FOAF and SIOC can be combined to describe one’s social activity: • foaf:Person is used to represent the physical person • sioc:User is used to represent his user account(s) • Since FOAF is widely used on the Semantic Web, it can provide a great source of linked data between different datasets • Use owl:sameAs between different FOAF URIs to provide more linked data • SIOC profiles can link to an external FOAF URI • Example of linking from SIOC to FOAF

  11. A person and their user accounts

  12. Linking to SIOC data « from the outside » • foaf:holdsOnlineAccount • Relationships between persons and their account(s) • Linking FOAF profiles to sioc:User accounts • sioc:User rdfs:subClassOf foaf:OnlineAccount . • PersonQ foaf:holdsOnlineAccount UserAccountQ . • UserAccountQ a sioc:User . • Use dereferencable URIs and/or seeAlso • This depends on how RDF data are exposed by the target system

  13. Making SIOC data easier to discover • RDF autodiscovery • Content negotiation • RDFa

  14. Interlinking SIOC and SKOS data • SKOS – Simple Knowledge Organisation System • Can be used to link to Tags and Categories • The Tag Ontology defines Tag as subclass of skos:Concept • The sioc:topic property provides a way to define topic(s) of any content using (among others) SKOS concepts • Topics can be shared between communities • Interlinking data between communities thanks to those topics • SparqlPress • A WordPress/SPARQL Linked Data Project (work in progress) • http://wiki.foaf-project.org/SparqlPress

  15. Interlinking SIOC, FOAF and SKOS

  16. Interlinking SIOC and other resources • Reference datasets from the LOD initiative • DBPedia • GeoNames • MusicBrainz • …. • E.g., Semantic Microblogging (SFSW’08)

  17. Producing AND consuming data Interlinking with existing RDF data (e.g. GeoNames) Faceted browsing Weaving microblogging into the Semantic Web

  18. Interlinking SIOC and other resources (2) • MOAT – Meaning Of A Tag • Provide an ontology and tools to assign meanings to your tags with existing resources and then link tagged content with URIs of those resources rather than simple tags • Using URIs from reference datasets helps to interlink data • Eg: « SPARQL » tag => http://dbpedia.org/resource/SPARQL

  19. A Pipeline for Enriching SIOC Data • Post-process generated SIOC data • E.g. extract links to HTML, RDF and other types of data from the content • Extracting links • Simple, performed by a part of SIOC export plugins • sioc:links_to, rdfs:seeAlso • What about richer data? • Named entity extraction • Retrieve a subset of properties of resources a post links to • Enrich RDF data about a post with this information • Extract structured data contained within content items • Structured blogging, microformats • RDFa, GRDDL • Future directions • RDF-based online community sites

  20. Some producers of SIOC data • Sioku: • SIOC data from Jaiku microblogging service • http://sioku.sioc-project.org/ • Flickr: • Flickr to RDF wrapper • http://apassant.net/home/2007/12/flickrdf/ • SWAML: • Exports mailing list archives in RDF • Interlink with FOAF profiles using Sindice / SWSE • http://swaml.berlios.de/ • OpenLink DataSpaces: • Uses SIOC as a representation format for multiple social spaces • http://virtuoso.openlinksw.com/wiki/main/Main/OdsIndex/

  21. FlickrRDF using SIOC, FOAF, SIOC Types, Geo

  22. Social Media Data and SIOC • SIOC « type » module • http://rdfs.org/sioc/types • Defines subclasses of sioc:Container and sioc:Item • Blog, Wiki, MessageBoard … • BlogPost, WikiArticle, BoardPost … • Provides types for most of social media conributions • Object-centered sociality • Data portability • SIOC provides an open and machine-readable way for social data

  23. SIOC and Data Portability

  24. Open Questions • Choice of URIs • SIOC Community working on best practices • Issue: content negotiation may not always be available • Paging for large amounts of data • rdfs:seeAlso(s) ? • Your Comments / Questions?

  25. Summary SIOC is a part of the Linked Data Universe • RDF documents generated by SIOC export tools are usually interlinked between themselves • User-created content on online community sites can be a source of links to other LOD resources • Linking to external FOAF profiles • Extracting links to other resources from the content • SIOC-enabled sites generate SIOC and FOAF data that can be linked to by other data sources • Making data discoverable is important • SIOC can interlink LOD resources from a user-centric point of view • Object-centred sociality

  26. SIOC competition with boards.ie • boards.ie has been publishing social graph information online using FOAF since 2004 • With its 10 years of discussions, boards.ie can serve as a rich source of SIOC data for the Social Semantic Web: • The data to be “SIOC-ified” is already all publicly viewable, but it is difficult to leverage without any added semantics due to the fact that it is embedded in heavily-styled HTML pages • DERI are sponsoring a competition with prizes (the top prize is €3000) for whoever is judged to have produced the most interesting application(s) that makes use of the SIOC data exported from boards.ie • To enter, go to http://data.sioc-project.org

  27. Find people experienced in using SIOC / suggest improvements / participate in SIOC development • The SIOC project page and wiki: • http://sioc-project.org and http://wiki.sioc-project.org • The SIOC W3C member submission: • http://www.w3.org/Submission/2007/02/ • A SIOC developer mailing list: • http://groups.google.com/group/sioc-dev • Real-time IRC chat channel about SIOC: • irc://irc.freenode.net/sioc • A comprehensive list of SIOC applications: • http://rdfs.org/sioc/applications/ • The SIOC RDF Browser prototype: • http://sparql.captsolo.net/browser/ • Semantic Radar extension for Firefox: • https://addons.mozilla.org/en-US/firefox/addon/3886