Existing Wording: Some of these mechanisms make use of FHIR-based queries, FHIRPath and/or CQL as well as extensions that include expressions in one of these languages. Implementers should read the Using Expressions page for background and guidance on these technologies and extensions.

Comment:

If part of it is supported and other parts are not, it will make it very hard to create questionnaires that can operate in different systems. Some kind of sub-profiling might be required to indicate different configurations.

Summary:

Sub-profile population