[pdftex] Description of the /AF key

[Reinhard Kotucha]

On 2023-09-02 at 12:43:43 +0200, Ulrike Fischer wrote:

 > Am Thu, 24 Aug 2023 19:59:05 +0200 schrieb Reinhard Kotucha:
 >
 > > thank you for the explanation.  I found the /AF key when I examined
 > > the PDF file and assumed that AF stands for attached file.
 >
 > As Ross wrote, it stands for associated file. embedfile added the
 > key because of a bug-report about a validation error with pdf/A-3u.
 > I don't own the relevant ISO standard (ISO 19005-3:2012)

Hi Ulrike,
look at

  https://docs.verapdf.org/validation

 > so I could only guess that it added the two keys /AF and
 > /AFRelationship to PDF 1.7.

Admittedly I don't find them in the PDF-1.7 spec from Nov 2006 either
but only in PDF-2.0.

 > In any case you can not assume that it is always there, but if it is
 > there it will point to embedded files.

Thanks,
  Reinhard

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