Weaving SIOC into the Web of Linked Data

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

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

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

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)

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

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

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

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 »

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

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

A person and their user accounts

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

Making SIOC data easier to discover
RDF autodiscovery
Content negotiation
RDFa

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

Interlinking SIOC, FOAF and SKOS

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

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

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

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

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/

FlickrRDF using SIOC, FOAF, SIOC Types, Geo

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

SIOC and Data Portability

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?

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

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

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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Weaving SIOC into the Web of Linked Data

by Uldis Bojars on May 15, 2008

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Weaving SIOC into the Web of Linked Data — Presentation Transcript