(2014-02-28) Ghislain Atemezing: This model is related to the model for TORS in ISO 19108:2006, except that boundaries between eras are first class objects, supporting multiple properties, rather than being just time coordinates.
(2017-08-09) Pierre-Yves Vandenbussche: New version published. Check http://resource.geosciml.org/ontology/timescale/thors/w3c for alignement to w3c time ontology
