Consider using a Composition profile to describe the contents of the nkr submission Bundle - and reconsider usage of EpisodeOfCare for DiagnosisGroup

[ArdonToonstra]

Consider profiling a Composition profile to precisely describe the how the submission Bundle. Here you can specify which resources and sections should be in the Bundle.

Moreover, here you can also specify what should be in aggregrated inside the Bundle instead of profiling this for every reference element in the resource profiles.

Related to #29