Re: DRAFT: eXIf 2017-02-28

The section seems clear to me; the reference is to the format of the
*data*, not the format of the *chunk* (PNG) or the *marker* (JPEG).
Indeed, IRC, CIPA points out that JPEG (not CIPA/EXIF) limits the
length to 64k.

Since this is the only example, so far as I know, of EXIF embedded in
a foreign file format the reference is useful.  I think we have to
assume that the reader of the PNG spec will appreciate that references
to JPEG specific items in that section have to be interpreted with
respect to the corresponding features in PNG.

John Bowler

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