As a followup to T10525, the purpose interface could be amended to create more advanced plugins, like we formerly had in KIPI.

By "more advanced" I mean plugins that provide features beyond pure sharing, such as:

• export images with tag information
• adjust image orientation or date/time
• write tag data, description, etc. to files
• read advanced metadata from files (e.g. apply reverse geocoding). This last point may probably be tackled more effectively by implementing a generalized metadata importer in kphotoalbum itself, but I list it here because there used to be a KIPI plugin for just that feature.