Re: [Libexif-devel] Re: [libexif-cvs] libexif/libexif exif-data.c,1.77,1.78 exif-tag.c,1.24,1.25 exif-tag.h,1.12,1.13

[Hans U. N. <gp...@n-...>]

Lutz M=C3=BCller <lu...@us...> writes:

> On Wed, 2005-04-27 at 17:09 +0200, Hans Ulrich Niedermann wrote:
>> > Who defines these constants?
>>=20
>> That is meant as in "us or the EXIF specs?"
>
> EXIF spec. Some tags must/can be present in EXIF data, others must not
> be present in some IFDs, others must/can be present if certain
> conditions are met.

OK, of course the EXIF specs define what tags are optional, but it is
*us* who defines the values of the ESL_* constants.

>> > I'm just asking because this breaks
>> > binary compatibility. (ESL_NOT_RECORDED now 6 instead of 4, and 4 is
>> > not used any more).
>
> Why does the change break binary compatibility? The values are defined
> and used only inside exif-tag.c.

I guess then it is not a problem.

I suppose then there is no specific reason to use 1,2,3,5,6, leaving
out the 4, either.

Uli