source: https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/time-modification/
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time-modification
Parent element:
<note>
Time modification indicates tuplets, double-note tremolos, and other durational changes. A element shows how the cumulative, sounding effect of tuplets and double-note tremolos compare to the written note type represented by the and elements. Nested tuplets and other notations that use more detailed information need both the and elements to be represented accurately.
In this order
In this order (Optional)
<normal-type> (Required)
<normal-dot> (Zero or more times)
(Required)
(Zero or more times)
None.
This element is used in the following examples:
, , , (Double), , (Nested), (Regular), , Tutorial: Après un rêve