Category, classification, taxonomy, ontology

Classification, categorization, taxonomy and ontologies are different 
related
alternatives in knowledge representation, and all could be subsumed by 
generic
term of conceptual model. In my view we should NOT give distinct
support for classification schemes and ontology- that would be very 
confusion
and unnecessary. I suggest we continue to
talk about conceptual model with ontology representation as the key 
approach,
and say that degenerative form of this can be a classification scheme.
Here is one of many write ups we can find on this topic:

http://vanrees.org/research/papers/2003_cib.pdf

Some assorted links are at:
http://www.elearnspace.org/doing/classification_ontologies_taxonomy.htm

Amit