12.8 Validating and Modifying the Ontology 317
Figure 12.3 Medical chart ontology evolution. The temperature property is now
connected to theTestclass.
either connect it to all of the relevant subclasses of event. Alternatively, one
could simply connect it with theEventclass as in figure 12.4 so that every
event can potentially have such a measurement.
Figure 12.4 Another medical chart ontology modification. The temperature prop-
erty is now connected to theEventclass.
If an ontology is intended to be in use for a relatively long period of time,
one must expect that the ontology will evolve. When the ontology is being
used by a large community, one should develop standardized procedures for