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;
}