The numeral-root type represents the Roman numeral or Nashville number as a positive integer from 1 to 7. The text attribute indicates how the numeral should appear in the score. A numeral-root value of 5 with a kind of major would have a text attribute of "V" if displayed as a Roman numeral, and "5" if displayed as a Nashville number. If the text attribute is not specified, the display is application-dependent.
The
<numeral-root>element.The numeral-root type represents the Roman numeral or Nashville number as a positive integer from 1 to 7. The text attribute indicates how the numeral should appear in the score. A numeral-root value of 5 with a kind of major would have a text attribute of "V" if displayed as a Roman numeral, and "5" if displayed as a Nashville number. If the text attribute is not specified, the display is application-dependent.
See
https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/numeral-root/