The didactic material reusability, understood as its capability to be used in different learning situations or in diverse knowledge domains, is one of its most desirable features. This feature depends, among other factors, on the use of semantic annotations to describe relevant material characteristics, which can improve its localization and retrieval. In spite of the recognized value of semantic annotations, they are usually considered as optional. In this paper we describe the mechanism proposed in the MD2 approach to automatically generate semantic annotations within the didactic material development. Such mechanism tries to relieve users (developers) from the complexity of materials annotation and intends to obtain materials with some reasonable degree of reusability.
