source: https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/line/
MusicXML 4.0 >
MusicXML reference >
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line
Parent elements:
<clef>,
<part-clef>
Line numbers are counted from the bottom of the staff. They are only needed with the G, F, and C signs in order to position a pitch correctly on the staff. Standard values are 2 for the G sign (treble clef), 4 for the F sign (bass clef), and 3 for the C sign (alto clef). Line values can be used to specify positions outside the staff, such as a C clef positioned in the middle of a grand staff.
staff-line-position
None.
This element is used in the following examples:
and , , and , , , , , , , (Lines), , , , Alto Clef, Baritone C Clef, Baritone F Clef, Bass Clef, Bass Clef (Down Octave), Mezzo Soprano Clef, Soprano Clef, TAB Clef, Tenor Clef, Treble Clef, Tutorial: Après un rêve, Tutorial: Chopin Prelude, Tutorial: Chord Symbols, Tutorial: Hello, World, Tutorial: Percussion, Tutorial: Tablature, Vocal Tenor Clef