Symbiotic Relationships between Semantic Web and knowledge engineering

1
Symbiotic Relationships between Semantic Web and
knowledge engineering

• Impressions from Workshop 7

2
Administrative

• Chairs Mark Musen Derek Sleeman
• 13 papers
• US/Canada 3
• Europe 9
• US/Europe collaboration 1
• Format
• Session of 90 minutes 2x 30 min papers, 30 min
  discussion
• 1Invited speaker Alan Rector

3
Application dolmans

• Majority
• Medicine, biomedicine, microbiology
• Others
• Engineering, digital heritage
• Application domain has strong influence on
  perspective on ontology engineering
• e.g. on set of OWL constructs used
• Role of thesauri as light-weight ontologies as
  target for enrichment and mapping

4
Collaborative knowledge engineering

• Central theme, many projects tackle this (Halo,
  CRAFT, BioPortal, Collaborative Protégé, CleOn)
• Bottom-up vs. top-down
• Needs for annotations, work flows, differences of
  perspectives, mappings

5
Wikis and (collaborative) knowledge engineering

• Wikis are not a panacea
• Fulfill a limited but useful role, e.g. in
  collaborative taxonomy building
• Web style of editing is beneficial for users
• Special interfaces still used for rules an
  constraints
• Hit them high and hit them low

6
Ontology quality

• Ontology police?
• Quality is not an objective characteristic
  depends on perspective and use
• Good ontologies are used?! Or ontologies that
  are not used are bad ontologies
• Ontology engineering sometimes requires a small
  team for boot strapping (instead of large
  collaboration)
• Modularization important principle

7
Reasoning

• Ontologies seem to be the fashion
  problem-solving methods ( reasoning patterns)
  are not en vogue (although there is ongoing work)
• OWL DL classification reasoning used for ontology
  validation
• Variety of general reasoning methods (e.g.
  adductive)

8
Applications

• Examples
• Information retrieval
• biomedical information
• multimedia collections
• Proving hypothesis in functional genomics
• Web-based knowledge-based systems

9
Ontology representation

• OWL is de facto standard
• OWL DL appears to be the focus in the biomedical
  area this is not the case in the other domains
• Rules are used a lot SWRL is mentioned most