In this paper we discuss how the inclusion of semantic functionalitiesin a Learning Objects Repository allows a better characterization of the learningmaterials enclosed and improves their retrieval through the adoption of somequery expansion strategies. Thus, we started to regard the use of ontologies toautomatically suggest additional concepts when users are filling some metadatafields and add new terms to the ones initially provided when users specify thekeywords with interest in a query. Dealing with different domain areas andhaving considered impractical the development of many different ontologies,we adopted some strategies for reusing ontologies in order to have theknowledge necessary in our institutional repository. In this paper we make areview of the area of knowledge reuse and discuss our approach.
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