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Subject: End Time (was Proposal - Top Level Relationship Object)
What is ‘time’ is one of those hard concepts to nail down. I would suggest we be explicit:
Now things get interesting. Parallel with the ‘confidence’ discussion:
Even more interesting:
My preference is for ‘irrelevant’ as I will describe below. There is a distinction between unknown and irrelevant, just as a confidence of zero is different than no confidence. The reason I am leaning towards explicitly having an irrelevant value and requiring times is because if we make End_Time optional, then some will be lazy not have an End_Time to represent something ongoing. That is information that would be lost as most implementers will presume that a missing End_Time represents an event that ended but the sender did not know when.
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