Re: Multiline Sucject as PDF metadata

[Heinz-Jürgen Oertel]

Am Dienstag, 25. Januar 2022, 17:32:16 CET schrieb Deri:
> On Monday, 24 January 2022 12:44:22 GMT Heinz-Jürgen Oertel wrote:
> > Hi,
> > hope it will be possible,
> > to write multi line subject lines as PDF meta data
> > 
> > 
> > currently I us
> > .pdfinfo /Title .. /Author .. Keywords and Subject with succes.
> > All in one line, which is mostly enough for Title and Author.
> > But often I have a need to explain more about the document. What what help
> > is using more than one line. I tried different approaches, without success
> > so far.
> > 
> > Any ideas?
> > 
> > .pdfinfo Subject "line 1\nline 2\n..."
> > 
> > 
> > Greetings
> >    Heinz
> 
> Hi Heinz,
> 
> This metadata is held in the "document information dictionary" of the pdf. In 
> the pdf 1.4 standard the items Title/Author/Keywords/Subject are all defined 
> as text strings, so I believe that precludes them from being multiline.

Hi Deri,
I can edit the PDF, using vim, and split the long one line into this:


/Subject (Eine historische und statistische Skizze,
im Auftrage des Bischofs Ignatius Paoli von Nicopolis und Bucurest,
erschienen Würzburg 1879)

and Okular shows really three lines.


> However, the standard allows you to include your own custom keys as well. I 
> tested this with this troff code:-
> 
> .sp 1i
> .pdfinfo /Title PDFINFO Test
> .pdfinfo /Synopsis Here is a little more text

OK, will try it, may be it is useful. BUT, to add more information to the PDF, 
once it is ready for shipping, I use exiftool. E.g.

  exiftool \
        -License="CC-By-SA 4.0" \
        $(source).pdf
        rm $(source).pdf_original


Heinz