The part-link type allows MusicXML data for both score and parts to be contained within a single compressed MusicXML file. It links a score-part from a score document to MusicXML documents that contain parts data. In the case of a single compressed MusicXML file, the link href values are paths that are relative to the root folder of the zip file.
The
<part-link>element.The part-link type allows MusicXML data for both score and parts to be contained within a single compressed MusicXML file. It links a score-part from a score document to MusicXML documents that contain parts data. In the case of a single compressed MusicXML file, the link href values are paths that are relative to the root folder of the zip file.
See
https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/part-link/