I think conditional directives would be very useful in the context of
Score Layout View which I am working on. Different score layouts
(full-score, solo part, etc) require different page breaks. Being able
to label a page break directive as conditional for a certain Score
Layout would help here. It could also be used to allow, for example, the
use of Tenor clef in a bass line when intended for Cello while keeping
it in Bass or using Treble for a piano part (pianists are not fond of
C-clefs!). Or to place octave transposition marks in for a score layout
intended for treble recorder - one file with several score layouts
attached can then be used to print out parts for a variety of
instruments while still keeping the ability to edit the music. This
feature would go beyond what can be done in LilyPond - there is no way
to write a (externally) conditional page break in LilyPond as far as I
know.
However, I can't access the original notes on this topic ...
Richard
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