Interactivity types Instances of this class represent interactivity types. Interactivity type The flow of interaction between the learning object and the user. Learning Resource types Instances of this class represent learning resource types. Each such type should be an rdfs:Class that can be used as the value of an rdf:type property. Interactivity levels Instances of this class represent interactivity levels. Interactivity level The degree of interactivity between the end user and this learning object. Semantic Densities Instances of this class represent semantic densities. Semantic density Amount of information conveyed by this learning object as compared to its size or duration. Intended end user role Instances of this class represent intended end user roles. Intended end user role Principal user(s) for which this learning object was designed Learning Context Instances of this class represent learning contexts. Learning Context The principal environment within which the learning and use of this learning object is intended to take place. Typical Age Range Age of the typical intended user. Difficulty Instances of this class represent difficulties. Difficulty This element defines how hard it is to work through this learning object for the typical target audience. Typical Learning Time Approximate or typical time it takes to work with this learning object. Educational description Comments on how this learning object is to be used. Educational language The human language used by the typical intended user of this learning object.