start property
Start is the first day counted, "2006-01-02" inclusive. Empty for period=all, which has no lower bound at all.
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? start;