The ontology is available on VoCol and GitHub. I will use VOWL link to visualize and explain the ontology main concepts.
We have two main Classes:
1. Learner (which extends the User class of the ACCESSIBLE ontology in addition to the IMS AfA PNP properties) . The Learner class is deﬁned by a number of properties: hasRequiredAccessMode is the access mode required by a learner; here, the learners deﬁne their preference for the resource representation. For instance, a learner may deﬁne that if the resource is a visual one, she would prefer a textual representation.
2. DigitalResource deﬁnes the properties of an individual educational resource. The properties are designed based on the IMS DRD speciﬁcation. They describe the resource access mode (e.g., visual, auditory) and deﬁne if a resource has adapted versions (e.g., if there is an alternative transcript ﬁle to an auditory ﬁle).
The Learner class is linked with the DigitalResource class through an hasAccess relation, which is used to ﬁlter the accessible educational resources according to the user-deﬁned disabilities and preferences