terminal property
Terminal publishes (or, with "", withdraws) the URL this session's live terminal can be watched at. A pointer so "absent" and "withdrawn" are different requests: a session that stops sharing must be able to say so.
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? terminal;