The <miscellaneous-field> element.
<miscellaneous-field>
If a program has other metadata not yet supported in the MusicXML format, each type of metadata can go in a miscellaneous-field element. The required name attribute indicates the type of metadata the element content represents.
https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/miscellaneous-field/
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The
<miscellaneous-field>element.If a program has other metadata not yet supported in the MusicXML format, each type of metadata can go in a miscellaneous-field element. The required name attribute indicates the type of metadata the element content represents.
See
https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/miscellaneous-field/