The tap type indicates a tap on the fretboard. The text content allows specification of the notation; + and T are common choices. If the element is empty, the hand attribute is used to specify the symbol to use. The hand attribute is ignored if the tap glyph is already specified by the text content. If neither text content nor the hand attribute are present, the display is application-specific.
The
<tap>element.The tap type indicates a tap on the fretboard. The text content allows specification of the notation; + and T are common choices. If the element is empty, the hand attribute is used to specify the symbol to use. The hand attribute is ignored if the tap glyph is already specified by the text content. If neither text content nor the hand attribute are present, the display is application-specific.
See
https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/tap/