aifb denny vrandečić – aifb, universität karlsruhe (th) 1 mind the web! valentin zacharias,...
TRANSCRIPT
AIFB
Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 1 http://www.aifb.uni-karlsruhe.de/WBS
Mind the Web!
Valentin Zacharias, Andreas Abecker, Imen Borgi, Simone Braun, Andreas Schmidt
FZI Karlsruhe, GermanyDenny Vrandečić
AIFB, Universität Karlsruhe (TH), Germany
Workshop on new forms of reasoning for the Semantic Web: scalable, tolerant and dynamic Busan, KoreaNovember 11, 2007
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Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 2 http://www.aifb.uni-karlsruhe.de/WBS
Thesis
Not taking the web in Semantic Web serious has lead many Semantic Web researchers to do Semantic Systems and reasoning research without trying to tackle the fundamental challenges of the Semantic Web.
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Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 3 http://www.aifb.uni-karlsruhe.de/WBS
Overview
Hypotheses Current trends and misconceptions Problems Some solutions
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Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 4 http://www.aifb.uni-karlsruhe.de/WBS
Hypotheses
1. Web scale is not “just a bit larger”
2. Ontologies are always changing
3. There is no right ontology
Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 5 http://www.aifb.uni-karlsruhe.de/WBS
A triple
Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 6 http://www.aifb.uni-karlsruhe.de/WBS
Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 7 http://www.aifb.uni-karlsruhe.de/WBS
Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 8 http://www.aifb.uni-karlsruhe.de/WBS
Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 9 http://www.aifb.uni-karlsruhe.de/WBS
Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 10 http://www.aifb.uni-karlsruhe.de/WBS
OWLIM107 Triples
[29]
Suez Canal
Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 11 http://www.aifb.uni-karlsruhe.de/WBS
RDF Store subsecond querying108 Triples
[25,26]
Moon
Fensel / Harmelen estimate1014 Triples
Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 12 http://www.aifb.uni-karlsruhe.de/WBS
~109 TriplesEarth
Fensel / Harmelen estimate1014 Triples
Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 13 http://www.aifb.uni-karlsruhe.de/WBS
Jupiter
Fensel / Harmelen estimate1014 Triples
~1010 Triples
Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 14 http://www.aifb.uni-karlsruhe.de/WBS
Fensel / Harmelen estimate1014 Triples
~1011 Triples
Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 15 http://www.aifb.uni-karlsruhe.de/WBS
Distance Sun – Pluto
Fensel / Harmelen estimate1014 Triples
~1014 Triples
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Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 16 http://www.aifb.uni-karlsruhe.de/WBS
Hypotheses
1. Web scale is not “just a bit larger”
2. Ontologies are always changing
3. There is no right ontology
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Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 17 http://www.aifb.uni-karlsruhe.de/WBS
Dynamics of Web 2.0
100 edits in Wikipedia 200 tags in del.icio.us 270 image uploads to flickr 1100 blog entries
per minute!
No reason to believe the Semantic Web will be any less dynamic – rather more!
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Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 18 http://www.aifb.uni-karlsruhe.de/WBS
Reasons for change
Error correction New information Change of view Change of the world
None of these reasons will disappear
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Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 19 http://www.aifb.uni-karlsruhe.de/WBS
Hypotheses
1. Web scale is not “just a bit larger”
2. Ontologies are always changing
3. There is no right ontology
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Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 20 http://www.aifb.uni-karlsruhe.de/WBS
There is no right ontology
Many different views Conflicting views and interests Semantic desktop -> many ontologies
Ontologies are abstractions Different tasks lead to
different ontologies Many design choices Google Base: 100.000 schemas
Intentionally false (Spam)
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Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 21 http://www.aifb.uni-karlsruhe.de/WBS
Misconceptions
1. Classical reasoning approaches will be used on the web
2. Assumption of correctness
3. It is a logical web, not a statistical one
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Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 22 http://www.aifb.uni-karlsruhe.de/WBS
Making weaker languages
“Reducing the expressive power of a logic does not solve any problems faster; its only effect is to make some problems impossible to state.”
John Sowa
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Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 26 http://www.aifb.uni-karlsruhe.de/WBS
A logical web
Repeating a statement does not make it more true
Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 27 http://www.aifb.uni-karlsruhe.de/WBS
Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 28 http://www.aifb.uni-karlsruhe.de/WBS
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Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 29 http://www.aifb.uni-karlsruhe.de/WBS
Web Data Aggregation
“Statistical” aggregation necessary for opinions
Important in Information Retrieval (see PageRank)
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Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 30 http://www.aifb.uni-karlsruhe.de/WBS
A logical web
Repeating a statement does not make it more true
But more likely Rules in news: three sources for a story
Counting and relations matter Combine this with reasoning
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Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 31 http://www.aifb.uni-karlsruhe.de/WBS
Solutions?
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Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 32 http://www.aifb.uni-karlsruhe.de/WBS
See paper for more
More approaches to reasoning KB partitioning and summarizing Approximate reasoning Massive parallelization Special purpose reasoners Deductive database techniques
Combine retrieval and reasoning Emergence of Semantics
Ontology Maturing Change on the Semantic Web
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Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 33 http://www.aifb.uni-karlsruhe.de/WBS
Conclusions
Many promising approaches But which one to choose?
Use cases are needed most! To evaluate the approaches To point into the right direction
This is why this workshop is here…
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Denny Vrandečić – AIFB, Universität Karlsruhe (TH) 34 http://www.aifb.uni-karlsruhe.de/WBS
Thank you!
Not taking the web in Semantic Web serious has lead many Semantic Web researchers to do Semantic Systems and reasoning research without trying to tackle the fundamental challenges of the Semantic Web.