http://hl7.org/fhir/StructureDefinition/elementdefinition-bestpractice|4.0.1

Mark that an invariant represents 'best practice' rule - a rule that implementers may choose to enforce at error level in some or all circumstances.
NameFlagsCardTypeDescription & Constraints
Extension
0..1Mark a warning invariant as 'best practice'
 
extension
?..0
 
url
?..?
 
value[x] *
1..? ConformanceUseContext (extensible)
 
 
valueBoolean *
1..?boolean ConformanceUseContext (extensible)
 
 
valueCodeableConcept *
1..?CodeableConcept ConformanceUseContext (extensible)