Reconfigurable Metadata Schemas with Multivalued Elements: Towards Educational Repository Management Through Formal Grammars on the Clavy Platform

Clavy is an experimental platform for managing learning object repositories that allows defining metadata schemas specific to each educational domain and even to each repository. Additionally, Clavy enables dynamic reconfiguration of these schemas to modify the way learning objects are explored and visualized. In this paper, we motivate and detail the evolution undergone by Clavy metadata schema model to support multivalued descriptive elements. Furthermore, we characterize this extension as a restricted type of grammatical formalism, opening the possibility of using more general grammars to organize repository contents.