HL7 is a data interchange format, not a data storage format. You can't code to that spec the way you can to DICOM. EHRcon and CDA are jokes. And, of course,

HL7 is a data interchange format, not a data storage format. You can't code to that spec the way you can to DICOM. EHRcon and CDA are jokes. And, of course, the vendors who stitch together siloed datasets from proprietary vendors make a killing. So that's yet another group who loves the status quo.