This YouTube video about submitting a FHIR transaction bundle impressed me. It shows me two things:
- how a new resource (in the video, the Observation) referencing another new resource (the Patient) in the same bundle can be done, given that their link-up will be sorted out in the repository and reflected in the subsequent retrieval through a HTTP GET; and
- how a conditional create with the PUT method may be achieved, in case we cannot tell if such a resource (e.g. the Patient with an identifier) to be submitted may or may not exist.

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