http://hl7.org/fhir/StructureDefinition/valueset-rules-text|5.2.0

An expression that provides an alternative definition of the content of the value set in some form that is not computable - e.g instructions that could only be followed by a human.
NameFlagsCardTypeDescription & Constraints
Extension
0..1An alternative non-computable expression of the value set content
 
extension
?..0
 
url
?..?
 
value[x] *
1..?
 
 
valueMarkdown *
1..?markdown