scheme property
Scheme names how the value is sealed at rest, so a caller can tell a migrated record from a current one without opening it.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? scheme;