version property
version The identifier that is used to identify this version of the
structure definition when it is referenced in a specification, model,
design or instance. This is an arbitrary value managed by the
structure definition author and is not expected to be globally unique.
There is no expectation that versions can be placed in a
lexicographical sequence, so authors are encouraged to populate the
StructureDefinition.versionAlgorithmx element to enable comparisons.
If there is no managed version available, authors can consider using
ISO date/time syntax (e.g., '2023-01-01').
Implementation
String? get version => throw _privateConstructorUsedError;