conformance requirement 2 is confusingly worded. Consider rewording. What is mean by "all components of a population criteria"? Is this the population criteria within the FHIR file? If so, that should be made clear.

Existing wording:

Conformance Requirement 2 (Nested Libraries):
CQL libraries SHALL be structured such that all components of the
population criteria only explicitly reference a single library.

Proposed wording:

Conformance Requirement 2 (Nested Libraries):
CQL libraries SHALL be structured such that all CQL expressions referenced by the Measure
population criteria are contained within a single library.