On Fri, 13 May 2011 20:24:08 +0200, [UTF-8?]SaaÅ¡ha Metsärantala wrote
> > Volatile / dynamic dates
> I assume we mean "deictic dates" and, in this case, I would suggest to use
By "volatile" was indeed, generally, deictic meant, viz. date expressions
whose meaning is only defined by context from the perspective of speaker
resp. listener. These are of significant utility in query languages to
standardize the common concepts of "today", "now", "14 days ago", "tomorrow"
and intervals such as "past 14 days", "last 2 weeks", "this year" etc.
These I need. I currently have, lacking a standard, my own vocabulary. While
a date interval such as "past 14 days" can be calculated it is not always
reasonable. A search response, for example, that could return a facet
with "past 14 days" is much easier to implement and more efficient to use.
Queries with date expressions using something like "today" are reusable---
for example, "give me news stories about the Giro d'Italia today" for
current stories--- while their caculated instances are not (refer only to
the day that was caculated).
In our standard, however, we have a number of deictic concepts such
as "seasons" (these don't just differ between Northern and Southern
Hemisphere but also vary between astronomical and meteorological as among
cultures) that are NOT volatile. These are really not unlike named events,
resp. intervals. The date or interval meant by these expressions do not
change according to when they are uterred.
We have also dicussed in this list a number of "dynamic" or calculated
dates. Common calculated dates were, for example, U.S. election day (first
Tues in November) and a number of U.S. bank hollidays such as Labour Day,
Presidents day etc.
> the word "deictic" for clarity. Otherwise, the reader may wonder what kind
> of "nearly-deicitc" but "non-diectic" thing we mean here.
Edward C. Zimmermann, NONMONOTONIC LAB
Basis Systeme netzwerk, Munich Ges. des buergerl. Rechts