Hi,
The \textipa{} command, from the xunicode package, maps
the uppercase U letter to \textupsilon (actually, a turned
uppercase omega letter: Ʊ). I think this is wrong. It should be
mapped to \textscupsilon (the small-caps version of the same
symbol: ʊ). See this chart:
http://www.ling.ohio-state.edu/events/lcc/tutorials/tipachart/tipachart.pdf
Here is a patch:
--- /usr/share/texmf-texlive/tex/xelatex/xunicode/xunicode.sty.orig
2010-06-15 14:42:28.000000000 +0200
+++ /usr/share/texmf-texlive/tex/xelatex/xunicode/xunicode.sty 2010-06-15
15:29:41.000000000 +0200
@@ -771,7 +771,7 @@
\def R{\textfishhookr}%
\def S{\textesh}%
\def T{\texttheta}%
- \def U{\textupsilon}%
+ \def U{\textscupsilon}%
\def V{\textscriptv}%
\def W{\textturnm}%
\def X{\textchi}%
@@ -1482,7 +1482,7 @@
\DeclareUTFcharacter[\UTFencname]{x0288}{\textrtailt}
\DeclareUTFcomposite[\UTFencname]{x0289}{\B}{u}
\DeclareUTFcharacter[\UTFencname]{x0289}{\textbaru} % TIPA-0
-%\DeclareUTFcharacter[\UTFencname]{x028A}{\textscupsilon} % TIPA-U ???
+\DeclareUTFcharacter[\UTFencname]{x028A}{\textscupsilon} % TIPA-U ???
\DeclareUTFcomposite[\UTFencname]{x028B}{\m}{u}
\DeclareUTFcomposite[\UTFencname]{x028B}{\m}{v}
\DeclareUTFcharacter[\UTFencname]{x028B}{\textscriptv} % TIPA-V
Another problem is the \OE command, that should produce a small-caps
OE ligature \textscoelig (Unicode 0276, ɶ), but instead it is interpreted
as \O + E. However, remember that outside \textipa{} \OE is the
uppercase OE ligature (Unicode 0152, Œ).
Regards.
Ernest
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