DTV12 — DTV issue: time point kind

The concept ‘time of day’ in clause 10.3 is supposed to be a ‘time point kind’ per the resolution of issue 19319. If that’s correct, ‘time of day’ is missing “Concept Type: concept type”. But ‘time point kind’ has a Necessity “Each time point kind has at most one time scale” – and ‘time of day’ has multiple time scales.

It is not at all obvious, from their definitions, that clause 10.3 ‘calendar year’ and its siblings, are ‘time point kinds’. Either the definitions should make that clear, or Notes should be added to clarify these concepts.

DTV v1.1 says that ‘time point kind’ is a categorization type and thus a concept type.
The intent of ‘time point kind’ is ‘category of time point that characterizes exactly the time points on some time scale. ‘time of day’ has no time scale –not all of its instances are on any given time scale. But it also has no granularity, which violates the second Necessity in the section. All of the uses of ‘time point kind’ intend that it is associated with exactly one time scale. The definition and the verb concept should be modified to convey that intent.
With this narrower definition, ‘calendar day’ and its siblings are not ‘time point kinds’.