A relation that holds between two occurrents. This is a grouping relation that collects together all the Allen relations.

Do not use this relation directly. It is ended as a grouping for relations between occurrents involving the relative timing of their starts and ends.

https://en.wikipedia.org/wiki/Allen%27s_interval_algebra

http://purl.obolibrary.org/obo/IAO_0000125

https://docs.google.com/document/d/1kBv1ep_9g3sTR-SD3jqzFqhuwo9TPNF-l-9fUDbO6rM/edit?pli=1

Chris Mungall