I've made an improvement to jAlbum's "Add - from database file" tool. It can now import data (comments for instance) from XML files that carry the data within attributes as well as XML files that carry the data in nested elements.
(Made this update to allow importing old FotoPlayer "photos.xml" files in order to help restoring album projects from FotoPlayer albums)
Updated file (place within the "ext" folder of jAlbum):
https://jalbum.net/download/XMPInjector.jaext