Lou and Hugh, you've made my head spin and in large parts seem to be somewhat off the ranch. I believe you wholeheartedly if you say I made a mistake, but could you point out exactly what that mistake is? To recap the current released status: * @from & @to designate a duration * @notBefore & @notAfter designate a range during which something happened (that thing may have happened instantly or over a duration) * The Guidelines do not explain what any of the following combinations mean: - @from & @notBefore - @from & @notAfter - @to & @notBefore - @to & @notAfter - @when & any of @from, @to, @notBefore, @notAfter To recap the issue: * I complained that an example in the GLs used a combination for which there was no meaning; I thought we should change the example so it used a combination we explain. * Council said "No, Syd, that's a perfectly valid combination, the prose of the GLs should be changed to explain what each combination means -- we need a table". * I said "OK, I'll go do that", not remotely realizing how hard it is to generate a decent looking table. To recap the discussion: * James, at least, and I think one or two others, asserted (w/o objection) that any combination that includes @from or @to is definitionally a duration, not a range, even if @notBefore or @notAfter is present. * Peter, James, and I each asserted (initially w/o objection) that any of @from, @to, @notBefore, or @notAfter makes no sense with @when; therefore those combinations should not be permitted. * Later Hugh pointed out that there is an example with the use of @when, @notAfter, and @notBefore in the GLs -- so maybe those combinations should be allowed. To recap my changes: * Added the table to explain what each of the following 2-attribute combinations mean - @from & @to (duration) - @notBefore & @notAfter (range) - @from & @notAfter (duration, uncertain endpoint) - @to & @notBefore (duration, uncertain beginning) * Added prose to explain what the following 3-attribute combinations mean - @from, @notBefore, @notAfter (duration, uncertain endpoint) - @to, @notBefore, @notAfter (duration, uncertain beginning) * Added some examples I hope to address Hugh's post on the ticket (#1331) in a few mins.