Please find attached two presentations, kindly submitted by their author, Helle Schade-Sørensen, reflecting their assessment of the use of OASIS UBL as the document format for a nationwide einvoicing effort.

Note there is a third presentation dated 2010 "E-Invoicing in Denmark-the facts" from her and mounted publicly here: http://www.oasis-open.org/committees/download.php/36397 where on slide 2 she cites a savings of EUR500million over the first five years of using OASIS UBL.