According to DL.org, "the Cookbook is aimed at collecting and describing a portfolio of best practices and pattern solutions to common challenges faced when it comes to developing large-scale interoperable Digital Library systems. The current version of the Cookbook should not be considered neither authoritative nor final but rather as a 'work in progress' with the aim of enhancing it through external feedback".
After the Sonex work was presented last September at the 2nd DL.org workshop held in Glasgow, Sonex reached an agreement with DL.org as to provide technical feedback on the Cookbook regarding those usecase scenarios identified by Sonex.