“…In addition, ontologies will be represented here by means of multiple hierarchical restricted domains (MHRD) in a similar manner to that employed by other authors (see, for instance, Eschenbach & Heydrich, 1995). MHRDs have also been employed by our research group in other projects (Fernández-Breis & Martínez-Béjar, 2002;Fernández-Breis, Martínez-Béjar, Valencia-García, Vivancos-Vicente, & García-Sánchez, 2004). In particular, we term MHRD to a set of concepts holding the following:…”