Bridging Folksonomies and Ontologies For Knowledge Sharing ... · Bridging Folksonomies and...

Bridging Folksonomies and Ontologies

For Knowledge Sharing

on the Social Web

Freddy Limpens1, Fabien Gandon1, Michel Buffa2

1 : INRIA , 2 : I3S (CNRS - UNSA), Sophia-Antipolis

SoSEA 2008 First International Workshop on Social Software Engineering and Applications,

L’Aquila, Italy, September 15, 2008

2

Social Software

=

Interaction

Exchange

Sharing

3

4

5

6

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How to organize

this wealth?

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Social Tagging ?

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Or mess

of tags ?

10

Objectives

1. Overcoming the limits of folksonomies

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Objectives

1. Overcoming the limits of folksonomies

2. Semantic Web : interoperability accross Social Platforms

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- 1 -

Organizing / Structuring

Folksonomies

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From folksonomies towards ontologies

(Mika, 2007)

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15

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From folksonomies towards ontologies(Mika, 2007)

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Co-User Graph :Overlapping of

community of interest{Uj}

Ti

{Tj}

From folksonomies towards ontologies(Mika, 2007)

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Co-Utilization GraphCo-occurrence on Resources

{Ti}

{Tj}Ri

From folksonomies towards ontologies(Mika, 2007)

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Co-UserGraph

From folksonomies towards ontologies(Mika, 2007)

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Broader/Narrower relationsvia sub-communities of users

From folksonomies towards ontologies(Mika, 2007)

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Exploiting extra-information :Mapping with Ontologies

(Specia & Motta, 2007)

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1. Clusters of co-occuring tags

2. Selecting ontologies

3. Mapping between tags and ontologies

4. Infering semantic links

Exploiting extra-information : Mapping with Ontologies(Specia & Motta, 2007)

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Example of a cluster (del.icio.us) :

college

commerce

corporate

course

education

high

instructing

learn

learning

lms

school

student

Exploiting extra-information : Mapping with Ontologies(Specia & Motta, 2007)

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Exploiting extra-information : Mapping with Ontologies(Specia & Motta, 2007)

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- 2 -

Enriching Folksonomies

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Limits of tags

Variabilty of spelling and language

new_york = newyorkmusic = musique

Guiding Tagging with Ontologies(Passant, 2007)

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Limits of tags

Ambiguity :

toread ?RDF =? Ressource Description Framework

RDF =? Rwanda Defense Forces

Guiding Tagging with Ontologies(Passant, 2007)

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Limits of tags

« Flat » organization:

paris ? France ? Europe ? country

Guiding Tagging with Ontologies(Passant, 2007)

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Guiding Tagging with Ontologies(Passant, 2007)

Raising ambiguity thanks to ontologies

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Raising ambiguity thanks to ontologies

1 tag

Guiding Tagging with Ontologies(Passant, 2007)

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1 tag

2 concepts

Guiding Tagging with Ontologies(Passant, 2007)

Raising ambiguity thanks to ontologies

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Keeping track

of Tagging Info

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Keeping track of Tagging Info

1 tag = 1 object (Gruber, 2005)

1. Tagged object2. String of character3. User4. Domain of use5. Time

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Semantic Wikis

Sweet Wiki (Buffa et al, 2008)

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Sweet Wiki (Buffa et al, 2008)

Editing and Tagging wiki pages

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Sweet Wiki (Buffa et al, 2008)

1 new tag = 1 new concept

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Sweet Wiki (Buffa et al, 2008)

1 new tag = 1 new concept

Conceptual scheme iscollaboratively editable

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- 3 -

Ontologies to

Interlink Social Softwares

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SIOC (Breslin et al, 2005)

Semantically InterlinkedOnline Communities :

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SIOC (Breslin et al, 2005)

Semantically InterlinkedOnline Communities :

* Keeping track of social interactions

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SIOC (Breslin et al, 2005)

Semantically InterlinkedOnline Communities :

* Keeping track of social interactions

* Automatically generate semantic metadata

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Good practices :

« Web of Linked Data »(Berners Lee, 2006)

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Good practices :

« Web of Linked Data »(Berners Lee, 2006)

1. Http URIs to name

3. Provide extra info on each URIs

4. Linking URIs to other URIs

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46

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Revyu.com : sharing reviews on ... anything

(Heath & Motta, 2007)

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Anything that has a name can be reviewed

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Revyu.com (Heath & Motta, 2007)

Deriving semantics with extra source of info

ex : tag 'book'

=> Check ISBN (Amazon.com ou autre)

=> add rdf:type #Book

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Conclusions

-

Perspectives

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Objectives

1. Overcoming the limits of folksonomies

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Organizing folksonomies

A. Analyzing Co-occurrence patterns(Mika, 2005)

>> How to augment precision of the links?

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B. Exploiting extra-information(Specia & Motta, 2007)

>> How to select relevant sources ?

Organizing folksonomies

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Objectives

1. Overcoming the limits of folksonomies

2. Semantic Web : interoperability accross Social Platforms

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Guiding tagging with ontologies (Passant 2007)

>> How to ''naturally'' integrate structured knowledge ?

>> Incentives to contribute ?

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Tags as ''shareable'' objects(Gruber 2005, Passant 2008)

>> 1 tag = 1 URI ?

>> 1 tag = 1 wiki page ?

>> 1 tag = several share-ablemeanings ?

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Towards Inter-operability(SIOC, Web of Linked Data)

>> Developping ''viral'' plugins (SIOC)

>> Combining Social applications ?Bookmark + WikiPedia ?

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Thank you !

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Perspectives

>> Methods to select precisely the social data used for inference

>> Getting richer info about tagging

>> Exploiting acquaintance networks

>> Tools of monitoring/tunning of automatic treatments

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Keeping track of Tagging Info

1 tag = several meaning (Passant, 2008)

MOAT : Meaning Of A Tag

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65

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C. Getting Users to contribute

>> Games with a Purpose ?espgame.org

ontogame.org

Organizing folksonomies

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Tagging the Tags

(Tanasescu & Streibel, 2007)

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Tagging the Tags (Tanasescu & Streibel, 2007)

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Tagging the Tags (Tanasescu & Streibel, 2007)