Crémant de Savoie AOP


As I review the cahier des charges (specifications) for Crémant de Savoie AOP (page 18), I am unsure what they are saying (even when translated!). When it comes to the base assemblage, it seems to indicate that it would be 'beneficial' that the cuvée adhere to these 3 things: (1) minimum 40% Jacquère, (2) a combination of Altesse and/or Jacquère together or separately at a minimum of 60%, and (3) no more than 20% red varieties. 

Is this merely a recommendation? Or a hard rule? And if so, how to interpret minimum Jacquère requirement if it can be combined with Altesse for a minimum of 60%? We would love to ensure the right information for you all! 

Je ne sais pas! Merci!