For my background and wishes/plans look at the beginning of:

Will Piwigo meet my needs and desires? by calberga, now broken into several posts.

Is there a file format that I can create to up-load an "album" definition for a set of images already up-loaded, independant of their possible inclusion on other album(s)?

I would like to be able to assemble such information on my computer and up-load it as a batch.