This prototype
tool can be further improved for commercial use.
Next we summarize the guidelines of how to organize information in ontologies,
that is, different information should be put at different hierarchies of ontologies.
The general concepts in a domain should be put in the highest level ontologies, for
example, O1 in Figure 8. Here O represents Ontologies. If some concepts are specific,
they should be put in the lower level ontologies, for example, O2 and O3 in Figure
8. When some concepts are more specific, they should be put in even lower ontologies,
for example, O4-O9 in Figure 8. Figure 8 shows the hierarchy of ontologies.
We allow multiple inheritance in ontology organizations, for example, O6 inherits
both O2 and O3. In practice, the hierarchies can be more than three levels.
The hierarchy of ontologies is similar to the hierarchy of ontology languages. However,
because the concepts in ontologies will change (add in, move out, and update),
next we mainly discuss how to resolve the conflicts in ontology organizations.
Resolve Conflicts in Ontology Organization
Kalfoglou and Schorlemmer (2003) survey the related works on ontology mapping
and indicate that most of the previous works are about finding the similarities and
differences among ontologies, then the ontologies can be accessed from a common
layer.
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