Download - Term Dependence on the Semantic Web
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Institute of Web Science
iws.seu.edu.cn
Term Dependence on the Semantic Web
Gong Cheng and Yuzhong Qu
Institute of Web Science (IWS)
Southeast University, P.R. China
at ISWC 2008, Karlsruhe, Germany
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
What is happening on the hypertext Web
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
How about the Semantic Web
foaf:Person
foaf:Agent
wn:Agent-3
rdfs:subClassOfrdfs:subClassOf
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Term Dependence Graph (TDG)
foaf:Person
foaf:Agent
rdfs:subClassOf
wn:Agent-3
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Data Set
As of April 20089.8 million well-formed RDF documents114,408 hosts, or 7,290 registered domain names400 million RDF triples
http://iws.seu.edu.cn/services/falcons/
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Distribution of RDF documents on websites
bio2rdf.org
dbpedia.org
openlinksw.com
buzznet.com
bibsonomy.org
l3s.de
…
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Size distribution of RDF documents
Maximum at 5
NCI ThesaurusWordNet
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
How large is the TDG analyzed
1,278,233 terms as nodes (from 3,039 vocabularies)1,158,480 classes (90.6%)
118,808 properties (9.3%)
945 both (0.1%)
7,312,657 arcs (after removing self-loops)
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Distribution of terms in vocabularies
EthanAnimals
OpenCyc
DBpedia propertiesEthanAnimals
FMA
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Degree analysis of TDG
In-degree: direct influence degree
Out-degree: direct dependence degree
Average in-/out-degree: 5.72
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
In-degree
rdf:type
rdfs:subClassOf
owl:Class
rdfs:label
rdfs:comment
rdfs:Class
owl:equivalentClass
…
cyc:guid
…
64.9%
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Out-degree
40.9% at 5
Focal classes
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Correlation
Pearson’s correlation coefficient between in-degrees and out-degrees
0.006 [-1, 1]∈
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Distance analysis of TDG
foaf:Person
foaf:Agent
rdfs:subClassOf
wn:Agent-3
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Dependence depth
Average dependence depth: 10
Leaf classes in FMA
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Hop plot and effective diameter
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Connectivity analysis of TDG
93.4%
in FMA
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Connectivity analysis of TDG
over 40,000 disconnected pieces after 16 nodes are removed
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Vocabulary Dependence Graph (VDG)
foaf:Person
foaf:Agent
rdfs:subClassOf
wn:Agent-3
foaf
rdfs
wn
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
How large is the VDG analyzed
3,039 vocabularies as nodes
11,392 arcs (after removing self-loops)
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Degree analysis of VDG
rdf, rdfs, owl, daml
Average in-/out-degree: 3.75
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Main results
Power-laws
Complex structures within ontologieslong distance between terms
Only a few links between ontologies (excluding language-level ontologies)
All the data are available online.
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
More words
Linking Open Data (LOD)
Linking Ontologies on the Web (LOW)third-party links, e.g. ontology matching
publishing links online (collaboratively)
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Institute of Web Science
iws.seu.edu.cn
Gong Cheng [email protected]
Thank you for your attention
English Chinese Pronunciation
Semantic Web 语义网 yu`yiwon
Ontology 本体 benty
Class 类 ley
Property 属性 shu`shin