The text "CandidateExpressions should rarely, if ever, declare a name element." included should be removed, as this name can assist in managing the expression content.
This is also related to the use of the library extension, however could be for use in other non fhir based libraries.

https://chat.fhir.org/#narrow/stream/179255-questionnaire/topic/Candidate.20Expressions

Also, the descriptive text on the candidate expression page is very sparse compared to the very detailed content on the expressions page, can this be copied into the extension definition page?