Weaving SIOC into the Web of Linked Data

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    Weaving SIOC into the Web of Linked Data - Presentation Transcript

    1. Weaving SIOC into the Web of Linked Data Uldis Boj ā rs 1 , Alexandre Passant 2 , Richard, Cyganiak 1 , John Breslin 1 1 Digital Enterprise Research Institute, National University of Ireland, Galway 2 LaLIC, Université Paris-Sorbonne / Electricité de France R&D
    2.  
    3. 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
    4. The SIOC Core Ontology SIOC Ontology Specification http://rdfs.org/sioc/spec/
    5. SIOC d ata p roducers
      • SIOC a pplications l ist :
        • http://rdfs.org/sioc/applications/
      • > 20 a pplications for p roducing SIOC d ata :
        • F ree and o pen s ource
      • SIOC e xport t ools for:
        • Blogs and forums: WordPress, phpBB, Drupal, b2evolution
        • “ Legacy” applications: m ailing lists, IRC
        • New media: Twitter, Jaiku , Facebook, Flickr
        • Enterprise applications: CWE (collaborative work environments)
    6. SIOC RDF Browser
      • http://sparql.captsolo.net/browser
    7. The SIOC food chain
      • ~50 applications for working with SIOC data (producing, finding, consuming, …) listed at http://rdfs.org/sioc/applications/
    8. 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
    9. 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 »
    10. 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 to Comments & Users; …
      • All SIOC RDF pages are linked together starting from the top of the tree
      • Useful to crawl SIOC data
    11. 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
    12. A person and their user accounts
    13. 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
    14. Making SIOC data easier to discover
      • RDF autodiscovery
      • Content negotiation
      • RDFa
    15. 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
    16. Interlinking SIOC, FOAF and SKOS
    17. Interlinking SIOC and other resources
      • Reference datasets from the LOD initiative
        • DBPedia
        • GeoNames
        • MusicBrainz
        • … .
      • E.g., Semantic Microblogging (SFSW ’08)
    18. Weaving microblogging into the Semantic Web
      • Producing AND consuming data
      • Interlinking with existing RDF data (e.g. GeoNames)
      • Faceted browsing
    19.  
    20. 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
    21. 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
    22. 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/
    23. FlickrRDF using SIOC, FOAF, SIOC Types, Geo
    24. 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
    25. SIOC and Data Portability
    26. 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?
    27. 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
    28. 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
    29. 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

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