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In this paper, we present an ontology to represent the semantics of the IMS Learning Design (IMS LD) specification, a meta-language used to describe the main elements of the learning design process. The motivation of this work relies on the expressiveness limitations found on the current XML-Schema implementation of the IMS LD conceptual model. To solve these limitations, we have developed an ontology using Protégé at the knowledge level. In addition, we provide its implementation in OWL, the standard language of the Semantic Web, and the set of associated axioms in first-order logic. The OWL file is available at http://www. eume. net/ontology/imsld_a. owl.