The <key-alter> element.
<key-alter>
Non-traditional key signatures are represented using a list of altered tones. The key-alter element represents the alteration for a given pitch step, represented with semitones in the same manner as the alter element.
https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/key-alter/
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The
<key-alter>element.Non-traditional key signatures are represented using a list of altered tones. The key-alter element represents the alteration for a given pitch step, represented with semitones in the same manner as the alter element.
See
https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/key-alter/