Ontology Management on Community Semantic Web Portals

1
Ontology Management on Community Semantic Web
Portals

• Anna V. Zhdanova
• anna.zhdanova_at_deri.org
• January 7, 2005, Group seminar, Innsbruck,
  Austria

2
Overview

• Whats up?
• Whats new?
• Whats next?

3
You cannot control what you can submit and
receive on YOUR community portal
If I and Stefan need to exchange our telephone
numbers, we will have to go down to
email.... ....if all Stefans communities
exchange all missing data by email... ...Stefan
will probably not be happy with the quantity of
emails he gets!
How it started
4
Community Ontology Management

• Ontology development
• Ontology evolution
• Ontology alignment
• Ontology versioning
• ...cannot be supported
• by one person for the whole Semantic Web

Communites are...
...power...
...and they should be capable of managing
themselves
5
Approach

• Goal make community ontology managemnt and its
  benefits real
• Solution The Peoples Portal is...
• ...an environment that comprises
• an ontology management environment
• a community Semantic Web portal
• Definition A community semantic web portal is a
  semantic web portal that is maintained by a
  community of users.

6
Ontology Layer Pyramid
7
Architecture
4 main modules ontology management,
personalization-delivery,ontology alignment,
interportal-intercommunity interoperation
8
Functionality Overview

• Community ontology management
• Storage
• Alignment
• Versioning
• Aggregation
• Ontology layer pyramid support
• Distributivity support
• Knowledge acquisition user interfaces
• Publishing and delivery of Semantic Web content
• Restricted access and user profiling
• Community-based consensus reaching

9
Ontology Management Basics

• Jena file system and Sesame MySQL tried
• Jena file system remained, because
• Jena
• is most dynamically developed
• provides more relevant functionalities
• is most supported by the user communities
• The major bulk on the SW nowadays are in files,
  thus operating with files provides an opportunity
  of efficient aggregation and reuse of the large
  amount of SW data

10
Community Ontology Versioning

• Instance versioning
• Semantic change log
• Community instance versioning
• DERI use case official version vs. homepage
  version

11
Ontology Alignment Reusability
INRIA API was chosen for the community ontology
alignment module
12
Community Ontology Alignment

• Online version is at http//align.deri.org since
  26 Oct 2004
• Experimental, no real dissemination
• gt 20 equivalence mappings are acquired from
  users,

13
Knowledge Acquisition User Interfaces community
support
Interfaces are generated from and directly
interact with ontologies.
14
Publishing and Delivery of Semantic Web Content

• Used
• RDF ? XMLPHP ? webpage
• RDFJSP or Java servlet ? webpage
• Stayed with the last. Proper (not ad-hoc)
  publishing and delivery are to be implemented.

15
Consensus Reaching

• Solutions so far
• The Community Way

P2P
centralized

• seeAlso
• Zhdanova, A.V., Martin-Requerda, F., 2004.
  Reaching Consensus via Personalization and
  Community support, submitted.
• Zhdanova, A.V., et al., 2004. Knowledge
  Acquisition and Modeling of Process of
  Consensus, KnowledgeWeb D2.3.2.

16
Horizontal Ontologies
Related Work
Ontologies that might gain top usage SKOS
(Simple Knowledge Organization System)
http//www.w3.org/2004/02/skos/ SemWeb Vocab
Status ontology http//www.w3.org/2003/06/sw-voca
b-status/ns
The table is borrowed from How the Semantic Web
is Being Used An Analysis of FOAF Documents by
L. Ding, L. Zhou, T. Finin, A. Joshi,
Proceedings of the 38th International Conference
on System Sciences, January 2005.
17
SKOS
Related Work
18
Renowned SW Environments
Related Work
And their heterogonous ontology support.
Community environments? Yes. Community ontology
management environments? No.
19
DERI Use Case

• Available at http//homepage.deri.org
• 2 versions
• 1.0
• community-accessed since 20.10.2004
• 2.0
• community-accessed since 12.12.2004

20
DERI Use Case What People Said
gt60 requests since start till Dec 31, 2004
21
DERI Use Case What People Did
From Oct 20 to Dec 31, 2004
One more of acquired items PhD Student is a
sublass of HomeAnimal
22
Future Work

• Refining, improving, evolving the current work
• till autumn 2005
• Open large-scale community ontology management
  use case a portal in a leisure domain
• till the end of 2005

23
Conclusions

• Community Ontology Management
• is defined (invented)
• is shown to be important
• is shown to be feasible
• must go on.
• Thats it.
• Thanks to many DERI members who contributed to
  the work
• (as researchers, developers, technicians) and
  those who tried
• http//homepage.deri.org and gave feedback!

24
Questions?