"The one thing that surprised me about the Blue Button initiative was the output, which is either plain text or PDF. These are great output formats for the patient to read their health information, but they are not interoperable – they cannot be uploaded into another provider’s system."
"The CCD is unique in that it is has structured data that is also human readable using a standard style sheet. This means any patient can view the CCD document using a standard web browser, and an EHR may upload and update the patient health information stored locally. By satisfying human-readability and machine-readability, it is the best of both worlds."