The MusicXML 4.0 schemas and stylesheets are contained in the schema folder within the release. The key files are listed here:

Several deprecated files are also included in the schema folder for compatibility with older software. The contents of these files are not included this report.

The following files make up the deprecated Document Type Definition version of MusicXML 4.0:

The following files are used for the deprecated XML representation of Standard MIDI 1.0 Files: