speakerLabel
A reference to the label of the speaker position
(element name)
element is not present (extra spec name if needed)
(Dolby Atmos Master ADM Profile addition)
(subelement name)
subelement count (subelement count)
is not permitted, (min or max)
is (max count)
(extra spec name if needed)
(Dolby Atmos Master ADM Profile addition)