Comment:

FHIR uses many resources to represent either knowledge documents or patient records with each resource having its unique style. For instance, rules and order sets are represented using PlanDefinition whereas a questionnaire is represented with its own separate resource. A patient record appears to be represented using the Person resource but there also exists Composition and DiagnosticReport. Catalog definitions are currently represented using Composition as well though List has also been proposed. I think it may be a worthwhile exercise at this point to review all of these resources and perhaps consider a more compositional and consistent approach. My suggestion would be to start with Composition which is a fairly general structure consisting of metadata, sections and entries and allow the variation in the expressivity to reside with the choice of metadata structure and entry structures that ultimately define this Composition. For instance, the items in a questionnaire, the entries in a catalog, the actions in a plan definition, or the statements in a patient record represent different kinds of entries that are part of a composition. This allows all documents, whether definitional or patient-specific to be built on the same core resource.

Summary:

Use more compositional approach to resource design