More important is that this filesystem can be ZIPPED up and this zip file placed into an e-mail, hopefully secured with S/MIME. This is indeed a part of the Direct Project, where the security is mandated. The use of an XDM.ZIP file is part of the Direct project and is mandatory for any system capable of sending the XDM compliant ZIP. The reason this is mandatory is that the XDM format brings along many good advantages that allow for the receiver to more easily handle the documents. It includes metadata for
- Patient Identification -- patient ID, patient name, etc
- Provenance -- Author person, Facility, publisher, etc
- Privacy/Security -- Confidentiality Codes, Hash, Size, Author, Patient ID,
- Routing -- Intended Recipient, type of document, format of document, mime type, etc
- Lifecycle -- Previous document that this would replace, transforms, signs, etc
But if the receiver does understand the XDM then it can leverage the metadata.
Another place with XDM samples