No XMP metadata shown in properties

[Yves Roggeman]

In PDF-2.0 standard, the current one, /Info metadata are depreciated and no more generated by (some) software, like LuaTex.
Instead, XMP metadata are used to store Author, Title, Subject, Keywords, a.s.o.
Most PDF viewers actually show these parameters, together with the remaining /Info ones. See evince for example in Gnome world.
But sadly not qpdfview (version 0.5.0+ds-2, as in Ubuntu Mantic repositories) in its Properties dock…
I hope this will be soon corrected (or enhanced).
Thank you

[Adam Reichold (adamreichold)]

Hello Yves,

thank you for taking the time to report this! Do you happen to know if the integration of XMP metadata in Evince is done via the glib frontend of the Poppler library or if Evince accesses the XMP metadata directly itself? Maybe you even have a link to the corresponding source code? Thanks.

Regards,
Adam

[Adam Reichold (adamreichold)]

From a quick glance, it seems like this would entail fetching the XML data via `poppler::Document::metadata` and then parsing it using either a third-party library or code similar to that used in https://gitlab.gnome.org/GNOME/evince/-/blob/main/libdocument/ev-xmp.c

[Yves Roggeman (yrogge)]

Yes.
It seems that Evince uses its own code "ev-xmp.c" to retrieve XMP metatdata directly, parsing the PDF file into some internal struct.