[pdftex] pdf objects with references to each other?

[Hans Hagen]

At 12:05 PM 4/1/2002 +0200, Heiko Oberdiek wrote:

>Do you know a documented feature that can be used to solve
>the cyclic reference problem?
>
>\pdfobj{I am A and references B}
>\pdfobj{I am B and references A}

write the ref to a file and use it in the second pass

> > (3) it happens that object refs are numbers, but in a more advanced sheme
> > they could as well be token lists representing the object number and
> > revision number i.e. \the\pdflastobj expanding to something "0 10" or 
> "2 40"
>
>pdfTeX creates a PDF file for the first time. It would be a bad
>implementation, if there are revision numbers not equal 0.
>So pdfTeX does not contain documented access to the revision
>number of objects.

hm, i can imagine situations where it woul db enice if pdftex could add 
revision numbers, imagine that you want to include old content with the 
option of rollback

> > (5) so, carying over in a macro is a bit better than incrementing
>
>How a macro can help here?

write, read (second pass stuff)

Hans
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