On Thu, 6 Nov 1997, Robinson, Greg wrote:
> We are interested in how approximate dates can be represented in DC
> metadata. In libraries it sometimes arises that the year of publication
> of an item is not known, but the decade is, and the AACR2 standard is to
> use a hyphen to represent the unknown year: e.g. 199-. There are other
> AACR2 standard representations for unclear dates: e.g. 1996?, 198-?,
> etc.
>
> We have not been able to identify other standards that allow for unclear
> dates, so I guess that for these records we would give the SCHEME as
> AACR2.
>
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ISO8601 has some (very limited) capablities. Examples are at
http://www.ifi.uio.no/doc/iso/
Dw.
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