sequence property
Sequence is the definition itself — the same record create and the list return. Its status is the one that decides whether enroll is accepted.
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
Sequence? sequence;