1. Towards a Knowledge Diversity Model
Rakebul Hasan, Fabian Flöck, Katharina Siorpaes, and Reto Krummenacher
Slides: Denny Vrandečić and Elena Simperl
DiversiWeb @ WWW2011
March 28, 2011, Hyderabad

2. Collaboration on the Web is broken

3. Wikipedia and diversity
o Lemma selection level
• Do you want an article for each and every „The
Simpsons“ episode?
 Depending on your decision
 your audience will change
 your author pool will change
 the perception of your project will change
o Is the number of „members of Muslim faith“ identical in
• The Arab language Wikipedia
• The Hebrew language Wikipedia
• The English language Wikipedia
o Will borders be described differently in various Wikipedia
language editions?

4. Diversity support for wikis

5. Diversity-enhanced Web
Diversity-enabled Web applications
Diversity-enabled collaboration technology
Wiki platform Blogging platform Micro-blogging platform
Formal model for diversity information and information retrieval algorithms
Models , lightweight Search, selection Presentation
Summarization
reasoning and ranking and interfaces
Algorithms for mining diversity from text
Opinion
Multilinguality Bias in media Fact coverage Story links
detection
Data management infrastructure Annotation,
integration,
Blogs News Twitter Wikipedia LOD linking

6. Diversity model
o Captures all notions related to diversity-enabled information
management in a machine-understandable ontology
o Based on established upper-level ontologies and models in
information science
o Core concepts

7. Knowledge diversity glossary (paper)
o Agent o Metadata
o Belief o Object
o Bias o Objectivity
o Data o Object feature
o Diversity o Opinion
o Emotion o Opinion expression
o Entity o Opinion holder
o Event o Polarity of opinion
o Fact o Sentiment
o Information o Subjectivity
o Information object o Text
o Knowledge o Topic
7

8. Core concepts
o Agents holds opinions on a
topic
o Topics can be everything
o A Document is an
information object containing
opinion expressions
o Opinion and opinion
expression
o Bias of an agent or
document is the set of
opinions expressed by the
agent or in the document
o Diversity is the co-existence
of biases for a topic

9. Core concepts
o Agents holds opinions on a o Examples
topic • editor of wiki article
o Topics can be everything • journalist
o A Document is an • publisher
information object containing • blogger…
opinion expressions
o Agents are associated with
o Opinion and opinion additional metadata
expression
• basic metadata
o Bias of an agent or
document is the set of • social network
opinions expressed by the • history of publication
agent or in the document
o Diversity is the co-existence
of biases for a topic

10. Core concepts
o Agents holds opinions on a o Examples
topic • of a wiki article
o Topics can be everything • of a news story
o A Document is an o Topics can be related to each
information object containing other and aggregated
opinion expressions o Choice of a reference topic
o Opinion and opinion ontology would lead to biases
expression • No commitment to one
o Bias of an agent or topic ontology
document is the set of
opinions expressed by the
agent or in the document
o Diversity is the co-existence
of biases for a topic

11. Core concepts
o Agents holds opinions on a o Example
topic • article
o Topics can be everything • news story
o A Document is an • tweet
information object containing • blog post…
opinion expressions
o Documents are associated
o Opinion and opinion with basic metadata
expression
o Diversity mining algorithms
o Bias of an agent or operate on documents to
document is the set of identify opinions
opinions expressed by the
agent or in the document
o Diversity is the co-existence
of biases for a topic

12. Core concepts
o Agents holds opinions on a o Opinion expression is the
topic actual representation of an
o Topics can be everything opinion in a document
o A Document is an o Beyond simple sentiment
information object containing analysis
opinion expressions • Not just positive, negative,
o Opinion and opinion neutral
expression • e.g. “Palestine is a
o Bias of an agent or country”
document is the set of
opinions expressed by the
agent or in the document
o Diversity is the co-existence
of biases for a topic

13. Core concepts
o Agents holds opinions on a o Bias lies in the selection of
topic opinion expessions
o Topics can be everything o Algorithms can be devised
o A Document is an that predict a bias from
information object containing previous history of opinion
opinion expressions expressions and to calculate
o Opinion and opinion relationships between biases
expression
o Bias of an agent or
document is the set of
opinions expressed by the
agent or in the document
o Diversity is the co-existence
of biases for a topic

14. Core concepts
o Agents holds opinions on a
topic
o Topics can be everything
o A Document is an
information object containing
opinion expressions
o Opinion and opinion
expression
o Bias of an agent or
document is the set of
opinions expressed by the
agent or in the document
o Diversity is the co-existence
of biases for a topic

15. Example: Chocolate
Bias
Chocolate
is healthy requires
defines
Diversity
Opinions on
Opinion
Opinion expresses Chocolate
healthiness
expression of chocolate
lowers
“Chocolate lowers cholesterol
cholesterol” holds
Agent
contains User:
about
author Equinox
Document Topic
Chocolate
Wikipedia: Chocolate about

16. Next steps
o Representation in OWL
o Grounding in existing ontologies
• DOLCE, SKOS, Dublin Core, SPAR
o Fill the concepts with life / data
o Definition of APIs to access diversity-
enriched data

18. Summary
o Agents holds opinions on a
topic
o Topics can be everything
o A Document is an
information object containing
opinion expressions
o Opinion and opinion
expression
o Bias of an agent or
document is the set of
opinions expressed by the
agent or in the document
o Diversity is the co-existence
of biases for a topic