SpeechInputReference

speechInputReference := components.CreateSpeechInputReferenceInputAudio(components.SpeechInputReferenceAudio{/* values here */})

speechInputReference := components.CreateSpeechInputReferenceText(components.SpeechInputReferenceText{/* values here */})

switch speechInputReference.Type {
	case components.SpeechInputReferenceTypeInputAudio:
		// speechInputReference.SpeechInputReferenceAudio is populated
	case components.SpeechInputReferenceTypeText:
		// speechInputReference.SpeechInputReferenceText is populated
}