NameIDPolicy Format use clarification

Title: NameIDPolicy Format use clarification

Hi, just wanted to get a clarification on the format attribute (when it's valued with ...encrypted) inside of NameIDPolicy. It seems to imply that the requester cannot specify a particular format it wants (where the NameID coming back is in encrypted form). For example, what if I want an encrypted  ....emailAddress NameID.  Was that the intent?

Thanks, Tom.