Data model 

This extension does not provide a fully rounded data model but a set of service classes. A Location may be organised hierarchically to model, for example, world regions, countries, regions, cities, and buildings. A Period may similarly be arranged in a hierarchy to model historical periods, phases, or dates. Actor objects, on the other hand, may be grouped together via Tag labels, but otherwise stand on their own. They may refer to organisations, individuals, or other entities in the sense of actor-network theory.

In addition, the model provides flexible Tag objects to group other classes, Relation objects connect classes with qualifications like the role of an Actor, and SameAs classes to connect entities to authority data. Simple Keyword objects may be used to interconnect labels.

Graphical overview