mustSupport property
mustSupport
If true, implementations that produce or consume
resources SHALL provide "support" for the element in some meaningful
way. Note that this is being phased out and replaced by obligations
(see below). If false, the element may be ignored and not supported.
If false, whether to populate or use the data element in any way is at
the discretion of the implementation.
Implementation
FhirBoolean? get mustSupport => throw _privateConstructorUsedError;