The CSV export format is quite limited since it can only export a single flat structure.
Supporting XML would allow for better handling of the structured and related data. It would be even more cool if dbFront would allow for the use of XSLT to transform the XML.
Thank you for this request.
At the moment dbFront already supports, CSV and Excel exports.
NOTE: Please vote on this Feature Request if you want us to add XML as an export option.