The main hypothesis of the present work is that a learning object management platform, integrated with digital learning environments and able to recognize the semantics of its learning objects is the most appropriate content management system for educational purposes nowadays. Based on several years of accumulated experience working with these issues, this work proposes and evaluates an ontological model, which can represents the semantics of the several activities involved in the lifecycle of a learning object. A feasibility analysis of the proposed model and a comparative analysis of the properties of this model in respect to the stateoftheart are also presented at the end of the paper.