The other-ornament element is used to define any ornaments not yet in the MusicXML format. The smufl attribute can be used to specify a particular ornament, allowing application interoperability without requiring every SMuFL ornament to have a MusicXML element equivalent. Using the other-ornament element without the smufl attribute allows for extended representation, though without application interoperability.
The
<other-ornament>element.The other-ornament element is used to define any ornaments not yet in the MusicXML format. The smufl attribute can be used to specify a particular ornament, allowing application interoperability without requiring every SMuFL ornament to have a MusicXML element equivalent. Using the other-ornament element without the smufl attribute allows for extended representation, though without application interoperability.
See
https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/other-ornament/