The change_date slot should be date-typed

[gouttegd]

The change node has a change_date slot, supposedly intended to represent the date when a change was created.

That slot has no explicit range:

slots:
  […]
  change_date:
    slot_uri: dcterms:date
  […]

so it defaults to be string-typed, which doesn’t seem to make much sense. It should have a range of xsd:date (or possibly xsd:dateTime to allow finer granularity than a day) instead.

Related: I’m unsure what to make of the following comment in the slot_usage section:

change_date:
  comments:
  - This should be the composition of 'was generated by' and 'ended at time'

What does that mean? Is that why the slot is not date-typed? Is the slot supposed to contain a string representation of a more complex structure?