Existing Wording
"A value set can define its own codes, and/or"

Comments
Both HL7 Core Principles and HL7/OMG CTS2 specifies that codes in a value set are drawn from a code system. It is unclear how a value set can define its own codes. Can this be clarified?

Grahame's Comments
not quite sure what clarification is required. Presumably to do something like mention "inline code system" to make the purists happy?

Disposition
Considered - Question Answered

Disposition Comment
The ValueSet resource covers the functionality of both ValueSet and CodeSystem definition from a Core Principles perspective. This reflects how most systems typically work. We don't mention Core Principles in the specification because few FHIR implementers will be familiar with it. Understanding it is not a pre-requisite to using FHIR.