The clef-sign data type

The clef-sign type represents the different clef symbols. The jianpu sign indicates that the music that follows should be in jianpu numbered notation, just as the TAB sign indicates that the music that follows should be in tablature notation. Unlike TAB, a jianpu sign does not correspond to a visual clef notation.

The none sign is deprecated as of MusicXML 4.0. Use the clef element’s print-object attribute instead. When the none sign is used, notes should be displayed as if in treble clef.