In particular, it was needed in PREMIS (preservation metadata) for the case when there are permissions granted in association with the preservation of an object that may be time limited. A common case is that there is a start date and no end date specified. A repository may want to look for all those that are time limited vs. those that are open ended.
It is also used for publication dates of journals or other serially issued resources that have a start date but no end date.
Rebecca S. Guenther
Senior Networking & Standards Specialist
Network Development & MARC Standards Office
Library of Congress
101 Independence Ave SE
Washington, DC 20540
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From: Discussion of the Developing Date/Time Standards [mailto:[log in to unmask]] On Behalf Of Ray Denenberg, Library of Congress
Sent: Wednesday, March 16, 2011 1:00 PM
To: [log in to unmask]
Subject: Re: [DATETIME] Before/after indicator LAST CALL
> From: Saašha Metsärantala
> > 20040101/ Does anyone see a problem
> I consider that the notation is OK. But, are such open-ended intervals
> really useful?
Yes, the PREMIS community has cited this as a requirement, for preservation data.