[poe] Unsatisfiable consequence example

simonstey has just created a new issue for https://github.com/w3c/poe:

== Unsatisfiable consequence example ==
http://w3c.github.io/poe/model/#duty:
> If either of these fails to be fulfilled, then this will result in the consequence Duty also becoming a new requirement, meaning that the original obligation or duty, as well as the consequence Duty MUST all be fulfilled

**O1**: original obligation or duty
**O2**: consequence Duty

**O2** is triggered once **O1** is considered to be not fulfilled and as a result both **O1** and **O2** have to be fulfilled. 

> For example, if an obligation to provide data **by a certain date** is not fulfilled, the a consequence of a $100 fine is payable as well. 

**O1**: provide data by a certain date (e.g., 2017-12-31)
**O2**: pay 100$ fine

**O2** is triggered once **O1** is considered to be not fulfilled (i.e., date >= 2018-01-01), now **O1** and **O2** both have to be fulfilled. 
However, without updating **O1's** refinement constraints that's no longer possible, because in 2018 the obligation to provide data by 2017-12-31 can't be fulfilled anymore.

Please view or discuss this issue at https://github.com/w3c/poe/issues/275 using your GitHub account

Received on Friday, 29 September 2017 09:06:49 UTC