source: https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/time-relation/
MusicXML 4.0 >
MusicXML reference >
Elements >
time-relation
Parent element:
<interchangeable>
The element indicates the symbol used to represent the interchangeable aspect of dual time signatures, as specified in the time-relation type.
time-relation
None.
This element is used in the following examples: