+ void set_sign_language_video_language (dcp::LanguageTag lang) {
+ _sign_language_video_language = lang.to_string();
+ }
+
+ boost::optional<std::string> sign_language_video_language () const {
+ return _sign_language_video_language;
+ }
+
+ void set_dolby_edr_image_transfer_function(std::string function) {
+ _dolby_edr_image_transfer_function = function;
+ }
+
+ boost::optional<std::string> dolby_edr_image_transfer_function() const {
+ return _dolby_edr_image_transfer_function;
+ }
+
+ Standard standard () const {