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Pay attention to the profile constrain when building the encapsulation (see how to post document using MHD for more information). OID, patient number, practitioner are all metadata and parameter that should be filled properly. In the provided collection, fields where the patient's NISS is needed have been set to be the collection variable "Patient NISS".
The document itself needs to be encoded in B64 and put as value of the content node of the Binary resource.
The current version is beta and the structure will change in the future. The general idea will be the same