DDX

The DDX is an attempt to combine the information in the both the DDS and DAS into one response to eliminate the need to cross-walk the two responses when applying DAS information to variables. It will also streamline access somewhat and will employ XML as the content-type, although these are secondary objectives.

DAP 3.1

DAP 3.1 contains an implementation of this feature, which is described, in spirit, in the original DAP 4 specification document.