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DATETIME  March 2011

DATETIME March 2011

Subject:

Re: Request for clarification: Before/after indicator

From:

"Ray Denenberg, Library of Congress" <[log in to unmask]>

Reply-To:

Discussion of the Developing Date/Time Standards <[log in to unmask]>

Date:

Thu, 17 Mar 2011 12:32:21 -0400

Content-Type:

text/plain

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Parts/Attachments

text/plain (61 lines)

From Markus Flatscher
> Sent: Friday, March 11, 2011 5:50 PM
> To: [log in to unmask]
> Subject: [DATETIME] Request for clarification: Before/after indicator


> Just to make sure I understand the move of putting the before/after
> syntax on "last call": is the rationale for that move that anything
> expressed with the '.af' (and friends) syntax could be expressed
> otherwise anyways?

No, but see recent discussion on this, the thread beginning with:
http://listserv.loc.gov/cgi-bin/wa?A2=ind1103&L=datetime&T=0&P=5401

 and also
http://listserv.loc.gov/cgi-bin/wa?A2=ind1103&L=datetime&T=0&P=5770

In short, the quest for a use case for before/after is a moot point because we're going to include it anyway, because the approach we seem to be converging on is consistent with the existing syntax.

> [Case 1]: "before March 11, 2011"
> EDTF: unknown/2011-03-10 (note date adjustment) B/A last
> call: .bf.2011-03-11

This depends on what you mean by "before March 11, 2011" as it could mean:
(a) "the INTERVAL beginning at some unknown date and ending March 11, 2011", or
(b) "an EVENT that occurred during this interval",

unknown/2011-03-10  would mean (a)

.bf.2011-03-11   would mean (b)   

Note however, we are going to change the syntax to "[..2011-03-11]".

 
> [Case 2]: "after March 11, 2011"
> EDTF: 2011-03-12/unknown (note date adjustment) B/A last
> call: .af.2011-03-11
> Mathy: [2011-03-12,unknown[ (right-open interval for "unknown"?)

Similar to above, except in this case "[2011-03-11..]"

 
> [Case 3]: "not before March 11, 2011"

> [Case 4]: "not after March 11, 2011"

> [Case 5]: "on or before March 11, 2011"

> [Case 6]: "on or after March 11, 2011"

Actually  I should point out that the proposal to use double-dot is not going to accommodate all four of "before", "after", "before or on", and "on or after", 

but rather, EITHER:  "before" and "after",  OR "before or on", and "on or after".

And I propose the latter, because it seems more intuitive to the double-dot syntax.

I believe it is justifyable to represent only two rather than all four, since if
[..2011-03-11] means "a day on or before 2011-03-11" then if you need to represent "some day before 2011-03-11" you could use [..2011-03-12].

--Ray

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