in reply to tagging PDFs with keywords and filtering them later
Image::ExifTool is a module for adding keywords and other searchable metadata to PDF files and various other image formats.
You can use the OO interface, or its command line utility exiftool
% # add keywords to a PDF % exiftool -keywords=perl -keywords=snoopy test.pdf % % # read them back % exiftool -keywords test.pdf Keywords : perl, snoopy
In Section
Seekers of Perl Wisdom