[pdftex] pdf objects with references to each other?

Hans Hagen pragma at wxs.nl
Mon Apr 1 01:23:35 CEST 2002

At 03:29 PM 3/30/2002 +0100, Heiko Oberdiek wrote:
>On Sat, 30 Mar 2002, Hans Hagen wrote:
> > \setbox \yourbox {\immediate\pdfobj{...}\xdef\nicepointer{\the\pdflastobj}}
>                     ^^^^^^^^^^
>Because of \immediate an empty pdf object is created.
>So a \pdfobj{} without referencing does not generate
>an empty object in the pdf file, only the xref table
>is enlarged by a free number.

sure, but i assume that ... is something useful; also the fact that 
\pdfobj{} generates no object in the file is a side effect, since i could 
equally expect an real empty object ending up in the file since this is 
what is asked for; since there is a limit on the number of free object i 
hate the idea of 'free numbers' apart from the fact that 'enlarged' is also 

even the fact that \pdfobj, \pdfannot etc generates numbers of the same 
kind is only true because we observe that; if the pdf standard would have 
negative numbers for annotations, it woudl go unnoticed in most macros, 
unless one starts incrementing or decrementing, which is one reason why in 
context i never make any assumptions about order or nature of those numbers.

                                   Hans Hagen | PRAGMA ADE | pragma at wxs.nl
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