Re:If nothing else, it can help. (Score 1)

CDA is certainly comprehensive! It will be CDA though, while CCR is infinitely more practical and easier to handle, the folks at ASTM already did the deal with the devil and collaborated with the CDA people to produce CCD, so CCR is in some respects, already obsolete. For the legacy systems though, all you need is a little bit of gnarly software to map from HL7 2.x to CDA and back.