rootSessionId property
RootSessionID is the top of this session's tree, inherited from the parent and shared by every node in one flow. A root session's own id, when it has no parent. It is the key one indexed read pulls a whole flow by, and what ?root= narrows a list or a stream to.
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? rootSessionId;