1 Natural Language Processing Group HUGs Geneva Start.

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Presentation transcript:

1 Natural Language Processing Group HUGs Geneva Start

2 Acting as commentator for Olivier Bodenreider Robert Baud Hôpitaux Universitaires de Genève IMIA WG6 conference, Rome, April 2005 Acting as commentator and supporter for Olivier Bodenreider

3 Natural Language Processing Group HUGs Geneva Lexical and Statistical Approaches to Acquiring Ontological Relations Formal Methods for Casual Ontology? Olivier Bodenreider Lister Hill National Center for Biomedical Communications Bethesda, Maryland - USA Ontology and Biomedical Informatics Rome, Italy – May 1, 2005

4 Natural Language Processing Group HUGs Geneva What is the meaning of casual? Informal ? Random, unexpected ? Superficial ? Does it means that a casual ontology is: not a totally well-formed ontology, acting as an initial draft, not following the usual constraints! When enforcing the conditions for building formal ontologies, one immediately prepares a slot on the side in order to escape the rules! Is casual ontology to be opposed to formal ontology? Cf the discussion of this morning on reference ontology compared to application ontology.

5 Natural Language Processing Group HUGs Geneva A casual Semantic Net

6 Natural Language Processing Group HUGs Geneva Ontology building in the Semantic net Event Activity Human activityMachine activity Ontology building activity Recreational activity

7 Natural Language Processing Group HUGs Geneva Adequate methods for seeking goals Heuristic approach Automatic extraction Fuzzy knowledge Well defined knowledge

8 Natural Language Processing Group HUGs Geneva Combining formal and casual Formal ontology Provides a framework for building sound ontology Too labor-intensive for building large ontologies Can benefit from loosely defined ontologies Casual ontology Usually unsuitable for reasoning Tools for automatic acquisition available Can benefit from formal ontology Organization Validation

9 Natural Language Processing Group HUGs Geneva Terminology is not ontology We have a « long tradition of terminology building » but we lack a real culture of ontology building Current developments on automatic knowledge extraction is mainly outside of the biomedical domain Their authors are mainly linguists, they are terminology oriented, they are not originally ontology oriented Terminology is language dependent Ontology is domain dependent and language independent An ontology acts as a structuring entity behind a terminology

10 Natural Language Processing Group HUGs Geneva Proposal, we should: … avoid the term casual ontology as a kind of second-hand ontology … recognize the mutual benefits of simultaneous developments of heuristic and automatic approaches … clearly make the distinction between terminology and ontology, not everybody being expert in both domains … better define the vocabulary about ontology … educate the future authors of ontology in the medical domain … enforce the rules for building formal ontology using both heuristic and automatic tools

11 Natural Language Processing Group HUGs Geneva Many thanks to Olivier