Metadata standards allowing the description, discovery, management and reuse of learning objects are of focal interest in the educational domain. However, current standards do not reflect recent developments in e-learning stressing the importance of adaptability of learning resources to the learners' needs and preferences. Within the EASEL project (URL: http://www.fdgroup.com/easel), our objective is to extend and use current metadata standards to support the discovery of adaptive content as well as its management and reuse. Thus, in this paper, we focus on specifications describing the adaptivity of learning contents. A generic extension for current metadata schemas is suggested that is independent of the pedagogical model underlying the adaptivity.