Position of cue clefs?

[Reinhold Kainhofer]

As you know from my previous patch (http://codereview.appspot.com/2726043), 
I'm working on clef support for cue notes. Unfortunately, I found out that all 
scores handle cue notes with clefs a little different, and I don't really know 
what the modern convention is. Does anyone have some deeper insight?
To give you an idea, I looked at several instrumental parts at IMSLP anc 
copied out some occurrences of cue clefs:
http://www.fam.tuwien.ac.at/~reinhold/LilyPond/LilyPond_CueClef/

In particular, 
-) the cue start clef is sometimes before the barline, sometimes after. 
(Typically, if a clef/key/time change is involved, the cue clef comes after 
the barline, otherwise before the barline; But that is not always the case)
-) The cue end clef is sometimes before, sometimes after the barline
-) If cue notes go across a line break, the clef is sometimes printed after 
the original instrument's clef, sometimes it replaces it, and sometimes no cue 
clef is printed
-) If cue notes start immediately after a line break, sometimes the clef for 
the cue notes is printed on the previous line, but most of the times it is 
not.

Of course, as IMSLP can only provide scans of out-of-copyright editions, they 
are quite old and might not reflect the modern conventions. Does anyone have 
some parts with cue notes and clefs by some of the distinguished music 
publishing companies?

Unfortunately, Gardner Read does not say anything about clefs for cue notes 
(just uses them in two examples!), Kurt Stone does not use a clef on cue notes 
(but uses an ottava bracket instead!), and I don't have any other book on 
notation...

Thanks a lot,
Reinhold
-- 
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Reinhold Kainhofer, address@hidden, http://reinhold.kainhofer.com/
 * Financial & Actuarial Math., Vienna Univ. of Technology, Austria
 * http://www.fam.tuwien.ac.at/, DVR: 0005886
 * LilyPond, Music typesetting, http://www.lilypond.org