Schema Evolution publication categorizer

In this article, we propose a new ontology evolution approach that
combines a top-down and a bottom-up approach. This means that the manual
request for changes (top-down) by the ontology engineer is complemented with
an automatic change detection mechanism (bottom-up). The approach is based
on keeping track of the different versions of ontology concepts throughout their lifetime (called virtual versions). In this way, changes can be defined in terms of these virtual versions.