I am concerned about the version-management scheme presented here. For example, if a radiologist is 'moving' back and forth between a viewer (creating measurements that translate to FHIR Observations) and the dictation app (describing ROIs that translate to content in the document), I feel that there is a large potential for synchronization errors. Specifically, if the concept is that a single anchor resource is versioned with everything else as contained resources, multiple systems will be changing sections (the contained resources) concurrently.