MusicXML specifications and chord symbols

[abeneudge]

I have been taking a look at musicXML specs and as far as I know, support for chord symbols does not saves the duration of the chord. This is an example for G6/D (from here): \[code\] <harmony default-y="100"> <root> <root-step>G</root-step> </root> <kind halign="center" text="6">major-sixth</kind> <bass> <bass-step>D</bass-step> </bass> </harmony>\[/code\]It seems that a chord has to be associated always with a note. But suppose we have a 9/4 bar with a whole note, and three chords each of them lasting three beats, and in the next bar we have another whole note, and again three chords but now, the first lasts 4 beats, the second 3 and the third 2. So:\[code\]bar1 (9/4): Cm7 (3) Dm7 (3) Em (3)bar2 (9/4): Cm7 (4) Dm7 (3) Em (2)\[/code\]Is it possible to save that as musicXML format?