LilyPond MusicXML export

[Menu Jacques]

Hello Folks,

A newbie question : does there exist something simililar to \displayMusic, that 
would display the structure of \score blocks? This could be a starting point 
for such an export.

And also : has it been considered/studied to perform a two-pass compilation of 
LP, with the first pass creating some internal form as Scheme data (hence the 
question above) and the second pass creating the grobs from the latter? Such a 
separation of concerns could also help I guess, even though it might involve 
much work.

JM