1) rewriite profile section as follows to clarify differences: " A use case specific Notification Bundle is defined by starting with base constraints in the [Da Vinci Notifications MessageHeader Profile] and [Da Vinci Notifications Bundle Profile] and creating a more tightly constrained MessageHeader Profile. Resources that are referenced within the Bundle are profiled to complete the Bundle definition. Depending on the use case, existing profiles may be used or new profiles defined. See the Admit/Discharge use case for an example of using FHIR Profiles to define the Bundle. FHIR profiling is more mature mechanism and broadly supported by the implementation community, reference implementations, and validation tooling. However,there is no mechanism to enforce profiles in a message on a reverse link because “reverse links” cannot be traversed forward from the MessageHeader. It may also require more artifacts than using MessageDefintion/GraphDefinition. {:.highlight-note} (Pre-applied) remove GraphDefinition section as proposed in FHIR-nnnn