AceWiki: A Natural and Expressive Semantic Wiki
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Transcript of AceWiki: A Natural and Expressive Semantic Wiki
AceWiki:A Natural and Expressive
Semantic Wiki
Tobias KuhnUniversity of Zurich
Semantic Web User Interaction at CHI 2008Florence
5 April 2008
Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 2
Introduction
Semantic Wikis
Semantic Web meets Web 2.0
Shortcomings of existing semantic wikis
Hard to understand for people who are not familiar with ontologies and logic
Relatively inexpressive (mostly just subject-predicate-object structures)
Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 3
AceWiki approach
Wiki articles in controlled natural language
Attempto Controlled English (ACE)
Easy to understand: ACE is a subset of English
Expressive: ACE covers a large part of FOL
Example article:
Public demo: http://attempto.ifi.uzh.ch/acewiki
Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 4
AceWiki interface
Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 5
Predictive Editor
Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 6
Reasoning
AceWiki currently uses the OWL reasoner Pellet
ACE is more expressive than OWL
The sentences that are inside of OWL get a blue triangle; the others get a red one
Sentences that are in conflict with the current knowledge are not included into the ontology.
Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 7
Inferences
Reasoner is used to infer concept memberships and concept hierarchies.
Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 8
Usability-Experiment
Hypothesis: Average people are able to learn how to deal with AceWiki within a short amount of time and without the help of an expert.
Small-scale: 20 participants
Task for the participants:
Add knowledge to AceWiki!
only true and general knowledge
modify/delete the contributions of others, if appropriate
No instructions how to interact with the interface
Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 9
Background of the Participants
“How familiar are you with the term ...?”
Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 10
Results: Correct/Incorrect Sentences
Altogether 186 sentences were created by the users.
148 of them were “correct and sensible”.
Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 11
Results: Sentence Patterns (neg.) superconcept
(neg.) assignment
(neg.) role instance
superrole
Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 12
Results: Time
How much time was spent on AceWiki?
How much time was spent on the predictive editor?
Tobias Kuhn, SWUI 2008, Florence, 5 April 2008 13
Thank you for your attention!
Questions & Discussion