On Fri 2006-03-03T11:52:27 +0100, Andrea Preite Martinez hath writ:
> We should not mix up a "duration" (interval of time) with an "instant"
> (currently date/time), or different instants during the "duration". This
> semantic difference is reflected in the present list of UCDs.
I agree.
My confusion stems from the fact that the semantic definition for all of the UCD words consists of an incomplete sentence. In the absence of detailed descriptions such as those provided in this note I did not understand which ones were instant or duration or that observation is a superset of exposure.
This may be true of other, non-temporal, UCD words.
For the sake of averting subsequent misinterpretations, is there a way to include richer semantic definitions as part of the document itself? Or alternatively, to include an explicit, and obvious, reference to a separate "usage" document with examples, correspondences with FITS keywords, etc?
-- Steve Allen <sla-at-ucolick.org> WGS-84 (GPS) UCO/Lick Observatory Natural Sciences II, Room 165 Lat +36.99858 University of California Voice: +1 831 459 3046 Lng -122.06014 Santa Cruz, CA 95064 http://www.ucolick.org/~sla/ Hgt +250 mReceived on 2006-03-05Z08:28:52