From: Benjamin M Scarborough (benjamin.scarborough@student.utdallas.edu)
Date: Sat Nov 13 2010 - 03:19:55 CST
I believe that the key to getting these characters encoded is 
establishing that there is a vital semantic importance to the character 
that is lost if it is stripped away. This is the grounds for the 
Mathematical Alphanumeric Symbols block.
Unfortunately, figures 1 and 2 from JTC1/SC2/WG2 N3915 actually provide 
a reason -against- encoding. The meaning of the diacritic in these two 
examples is that the transliterated letters were ligated in the 
original text. In this usage, the mark can span any arbitrary number of 
letters; indeed, figure 2 shows the mark in question spanning four 
letters. This makes it a much better candidate for use in higher-level 
markup than a set of combining marks.
Figures 3 and 4 present a better case and show a stronger need for some 
combining triple diacritic. I notice that all seven examples between 
the two figures represent what would normally be two letters with a 
double diacritic, but some modifier symbol intervenes and stretches the 
tie to span three. However, proposing the triple diacritics used this 
way would require proof that the sequence of letters with the diacritic 
has some important difference from the same sequence of letters 
without, which N3915 fails to establish.
In any event, I happen to know that there is in some phonetic 
transcription system an "sch" with breve below. It is used to represent 
[ʒ], which contrasts with the unmarked sch used to represent [ʃ]. This 
is a clear semantic distinction, and so the sch with breve below should 
be encoded in some fashion, either as a sequence of characters or some 
fully composed one.
--Ben Scarborough
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