[pdftex] Description of the /AF key

[Reinhard Kotucha]

On 2023-08-24 at 10:17:25 +0000, Ross Moore wrote:

 > You are correct in that an embedded file (usually as an attachment)
 > need not be the same as an /AF associated file.
 > 
 > Associated files are meant to be treated as a *replacement* for the
 > content associated with a structural element, such as a Figure or
 > Formula.  For such a replacement to be used, the PDF consumer
 > software needs to be able to call on (perhaps external application)
 > software to interpret the contents of that file. Normally there
 > will be a rectangle in which to show the graphic result from that
 > software.
 > 
 > An Embedded file, on the other hand, does not contribute to the way
 > the view of the PDFÕs content is displayed, apart from having an
 > annotation that indicates its presence, and links to a way to
 > extract the file for external use.  This is just like having an
 > attachment to an email message.
 > 
 > The AssociatedFile structure is more involved than an EmbeddedFile,
 > which latter has been around in the PDF standards for much longer.

Hi Ross,
thank you for the explanation.  I found the /AF key when I examined
the PDF file and assumed that AF stands for attached file.  But now
it's much clearer.

Thanks again,
  Reinhard

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Reinhard Kotucha                            Phone: +49-511-3373112
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