Request: add an functionality/option to have the ability to add automatically and recursively (for all personnes and all images) the/some iptc keywords (related to the hierarchised ancestris data).
(FYI: a tool already exists, it's called exiftoof)
Examples, maybe by this way:
#exiftool -iptc:keywords+=name -iptc:keywords+=surname -iptc:keywords+=lieux_de_naissance iptc:keywords+=date_de_naissance iptc:keywords+=etc -o b.jpg a.jpg
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#http://www.sno.phy.queensu.ca/~phil/exiftool/exiftool_pod.html
#Add an IPTC keyword in a pipeline, saving output to a new file.
#cat a.jpg | exiftool -iptc:keywords+=fantastic - > b.jpg
iptc:keywords+=etc -o a-english.jpg a.jpg