Re: DRAFT: eXIF 2017-03-05

Simpler (a response to Phil, Cosmin and Willem all):

"The data shall be a valid TIFF stream conforming to the EXIF requirements."

That's sort-of Pavel's point from a while back (referencing the base
EXIF definition not the JPEG specific part).  I still think the
reference to the JPEG specific format is useful, but I admit it isn't
completely accurate because some parts of the JPEG discussion do not
apply to PNG.  I suspect any implementer is intelligent enough to
realize that, but, whatever.

Saying anything more than the above paragraph will end up not
permitting raw JPEG APP1 data to be included and will lead down a
twisty path to an expectation that decoding libraries can be dinged
for not enforcing spurious data consistency checks.

John Bowler

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