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I like the fact to work on extgallery and keeping the work done by voltan !
About the folder structure, i'm not a developper and do not see the advantage of xml file... But i looked in PIWIGO gallery i'm testing for 2 monthes, having also a folder structure, and didn't see any xml files on folders (only pwg_high and thumbnail folders)
If you are interested in having a look to an existing PIWIGO gallery, to see how it works and maybe get some ideas, please let me know and i will give you access to mine !
Regards