i18n core comments on "Time Ontology in OWL" Working Draft

Hello SWD Working Group,

These are comments on http://www.w3.org/TR/2006/WD-owl-time-20060927/
which I am sending on behalf of the i18n core Working Group. We are
looking forward to discuss these with you.

Regards, Felix

- General: The i18n core WG has published a Working Group note on
"Working with Time Zones", see
http://www.w3.org/TR/2005/NOTE-timezone-20051013/ . It would be great if
you could consider adopting the following terminology, which is
described in that note:
* time zone: an identifier for a specific location or region which
translates into a combination of rules for calculating the UTC offset.
* zone offset: the difference in hours and minutes between a particular
time zone and UTC
* ID for a time zone: necessary for a time zone sensitive calendar system.
Although you use both the terms "time zone" and "zone offset", we think
that a section with clear definitions would be beneficial.

- The translation of durations between various country / region specific
calendars might become difficult with your design of durations. An
example: translating a 1 month duration into another calendar, for
example, gets hard, since "1 month" is not a fixed number of days in
either the source or target calendar.

- The "Olson time zone database" is a common source for time zone IDs.
See http://www.twinsun.com/tz/tz-link.htm for more information. It would
be great if you could refer to that data base and describe how your
ontology relates to it (has it more information, less / the same?).
See sec. http://www.w3.org/TR/2005/NOTE-timezone-20051013/#d2e226 .