Abstract
Update mechanisms for diagnostic classifications should capture changes in medical
knowledge but also allow for comparability across versions. This paper provides a
basis for such a mechanism by describing types of IS-A statement and types of knowledge
used in the construction of diagnostic classifications. Three types of IS-A statement
are used: ‘A is by definition a 8’, ‘A is probably a 8’ and ‘A is in theory necessarily
a 8’. Each relates to a different type of knowedge: knowledge of linguistic conventions,
of probabilities, and of empirical theories and their status, respectively. Consequently,
the development and maintenance of diagnostic classifications requires a collaboration
of medical terminologists and medical scientists. The role of the latter is especially
important during updating. Updating is necessitated by changing probabilities and
by the introduction or changing status of empirical theories. The linguistic notion
of hyponymy oversimplifies the issue.
Keywords
Classificaton - Terminology - Semantics - Logic - Knowledge Representation