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1999.10.28 10:31 "Stupid TIFF question: tags in ascending order", by Robert Vesterman
1999.10.29 03:27 "Re: Stupid TIFF question: tags in ascending order", by Daniel Mccoy
1999.10.29 04:18 "Re: Stupid TIFF question: tags in ascending order", by Tom Lane
1999.10.29 07:15 "Re: Stupid TIFF question: tags in ascending order", by Rainer Wiesenfarth
1999.10.29 09:23 "Re: Stupid TIFF question: tags in ascending order", by Robert Vesterman

1999.10.29 07:15 "Re: Stupid TIFF question: tags in ascending order", by Rainer Wiesenfarth

Robert Vesterman wrote:
> 
> Hi.  The TIFF 6.0 Specification says, "The entries in an IFD must be
> sorted in ascending order by Tag."
> 
> Stupid question: does this mean strictly ascending order? In other words,
> is it legal to have the same tag twice (or more) in a single IFD? If so,
> how is a TIFF reader supposed to interpret situations like this? Ignore
> the earlier tag? Ignore the later tag? Something else?

AFAIK there is no need to add one tag more than once (no one ever had
this idea). I found no reference to unique tags in the spec, but I
think unique tags are implied. Which tag do you want to use more
than once (and why)?

Rainer

> [...]

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