If MessageHeader.focus is going to have requirements as to the reference resources, it seems like they should be given a slices with specific cardinalities for specific profiles (1..1 for PAOTask etc). At a minimum, the typo in "include reference" should be fixed so it's not "inlcude"

Existing Wording:

shall include at least reference to PAOTask, one of PAOdevicerequest, PAOservicerequest, PAOmedicationrequest, and should inlcude reference to PAOsubscription