Tom Morris:

I don't think the concept of "lifespan" as an event makes sense”


Lifespan is a time period not an event, and that was the point, to distinguish the two concepts.




From: Discussion of the Developing Date/Time Standards [mailto:[log in to unmask]] On Behalf Of Tom Morris
Sent: Tuesday, March 29, 2016 1:08 AM
To: [log in to unmask]
Subject: Re: [DATETIME] distinction between a period of time and an event


An interval and an imprecisely known instant are not the same thing. A person with a lifespan of 1903/4 through 2016-03-17 lived during a period of time where one end of the interval is not fully known (so is, itself, an interval), so the duration of the interval is not known. The interval representing the bounds of imprecision for the birth date, and thus the lifespan interval, serves a very different purpose in my mind.


I don't think the concept of "lifespan" as an event makes sense. It's a closed interval with two terminal events, even if the dates of the events aren't known with precision. There are related events such as "practicing in the mid-1930s" or "dead by 1927 when his will was probated" or "alive in 1637 when she gave testimony in court," but these events just help provide some maximal/minimal bounds for the terminal events in the lifespan.




On Tue, Mar 29, 2016 at 12:37 AM, Saašha Metsärantala <[log in to unmask]> wrote:


* 2001-06-06/2005-10-10 means that the person was born some day between 2001-06-06 and 2001-10-10 (inclusive).

I assume you mean "2005-10-10" instead of "2001-10-10". But why not use "2001-06-06..2005-10-10" there?

One of the comments on the recent draft suggested the use of:


".." for representation of an unspecified value that is "between" two dates (inclusive), such as "2015-01-22..2015-04.20".

I assume you mean: "2015-01-22..2015-04-20".

And the comment said:


This is not the same thing as a closed interval of "2015-01-22/2015-04-20".

This seems OK.

To me these are two separate concepts,

I agree.