The <alter> element.
<alter>
The semitones type is a number representing semitones, used for chromatic alteration. A value of -1 corresponds to a flat and a value of 1 to a sharp. Decimal values like 0.5 (quarter tone sharp) are used for microtones.
https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/alter/
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The
<alter>element.The semitones type is a number representing semitones, used for chromatic alteration. A value of -1 corresponds to a flat and a value of 1 to a sharp. Decimal values like 0.5 (quarter tone sharp) are used for microtones.
See
https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/alter/