heading property
String?
heading
Implementation
String? get heading {
if (containsKey(BuiltInAttributeKey.subtype) &&
containsKey(BuiltInAttributeKey.heading) &&
this[BuiltInAttributeKey.subtype] == BuiltInAttributeKey.heading &&
this[BuiltInAttributeKey.heading] is String) {
return this[BuiltInAttributeKey.heading];
}
return null;
}