answer property
Answer is the synthesized prose. EMPTY is a real answer here: nothing in the index matched, or synthesis was unavailable — read degraded and citations to tell those apart. It is never written without grounding.
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? answer;