InputReference

inputReference := components.CreateInputReferenceAudioURL(components.ContentPartAudio{/* values here */})

inputReference := components.CreateInputReferenceImageURL(components.ContentPartImage{/* values here */})

inputReference := components.CreateInputReferenceVideoURL(components.ContentPartVideo{/* values here */})

switch inputReference.Type {
	case components.InputReferenceTypeAudioURL:
		// inputReference.ContentPartAudio is populated
	case components.InputReferenceTypeImageURL:
		// inputReference.ContentPartImage is populated
	case components.InputReferenceTypeVideoURL:
		// inputReference.ContentPartVideo is populated
}