XMP query - actually rhymes...

[nafetslesierk]

Hi!

Why does this work,

exiftool abc.pdf -xmp-bibtex:volume
-> Volume: 89

but this does not:

exiftool abc.pdf -xmp-bibtex:volume="123"
-> "Warning: Tag 'xmp-bibtex:Volume' does not exist
-> Nothing to do.

Cheers

Stefan

[Phil Harvey]

Hi Stefan,

ExifTool will extract any XMP information that exists, even if it hasn't been pre-defined.  But ExifTool can only write tags that have been pre-defined.  You can create user-defined tags to write anything you want.  See the XMP-xxx example in the sample config file.

- Phil

[nafetslesierk]

THANKS!
Will fiddle around a bit...
Best
Stefan

[Phil Harvey]

I have expanded this paragraph in the XMP tag name documentation in an attempt to clear this up in the documentation:

       ExifTool will extract XMP information even if it is not listed in these
       tables, but other tags are not writable unless added as user-defined
       tags in the ExifTool config file.  For example, the "pdfx" namespace
       doesn't have a predefined set of tag names because it is used to store
       application-defined PDF information, so although this information will
       be extracted, it is only writable if the corresponding user-defined tags
       have been created.

- Phil