Mr. Mikkel Heppe Brun, VP of Global Strategy for Tradeshift, has created a three-part review of the draft EU directive on e-invoicing: http://ec.europa.eu/internal_market/publicprocurement/e-procurement/e-invoicing/index_en.htm

These make for interesting reading:

http://blog.tradeshift.com/failing-to-deliver-the-draft-eu-directive-on-e-invoicing-part-1/

http://blog.tradeshift.com/failing-to-deliver-part-2-the-draft-e-invoicing-directive-a-detailed-look/

http://blog.tradeshift.com/failing-deliver-part-3-ideal-e-invoicing-dire...