modifierExtension property
modifierExtension May be used to represent additional information that is
not part of the basic definition of the element and that modifies the
understanding of the element in which it is contained and/or the
understanding of the containing element's descendants. Usually modifier
elements provide negation or qualification. To make the use of extensions
safe and managable, there is a strict set of governance applied to the
definition and use of extensions. Though any implementer can define an
extension, there is a set of requirements that SHALL be met as part of the
definition of the extension. Applications processing a resource are
required to check for modifier extensions.Modifier extensions SHALL NOT
change the meaning of any elements on Resource or DomainResource
(including cannot change the meaning of modifierExtension itself).
Implementation
List<FhirExtension>? get modifierExtension =>
throw _privateConstructorUsedError;