Existing Wording: preferred Instances are encouraged, to draw from the specified codes for interoperability purposes but are not required to do so to be considered conformant

example Instances are not expected or even encouraged to draw from the specified value set. The value set merely provides examples of the types of concepts intended to be included

Comment:

"extensible", "preferred" and "example" are identical in terms of conformance testing. The "example" binding seems to be redundant since implementers are not even expected to implement it. The examples can be part of "concept domains" if we decide to add the to FHIR terminology but an "example" binding seems unhelpful.