Standard Protocols Protocols for a composition. TopicsConstantsQCCompositionProtocolGraphicAnimationQCCompositionProtocolGraphicTransitionQCCompositionProtocolImageFilterQCCompositionProtocolScreenSaverQCCompositionProtocolRSSVisualizerQCCompositionProtocolMusicVisualizer See AlsoConstantsAttribute KeysComposition CategoriesStandard Protocol Input KeysStandard Protocol Output Keys