Data Portal @ linkeddatafragments.org

Matches in LOV for { ?s ?p A temporal ordinal reference system is a constrained temporal topological complex, in which the edges are called 'eras'. Each era may be subdivided into one set of eras of the next finer rank. This constraint is required to establish a mono-hierarchy, so that a set of temporal positions defined relative to the reference system may be uniquely ordered.. }