[XeTeX] Redefining \em and \emph

[Gareth Hughes]

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As I understand it, the line about redefining emphasis and inner
emphasis at the end of section 6.3 of the fontspec documentation

> XETEX users will need to load the xltxtra package before the advice above works.

is no longer true seeing as fontspec-patches now does this, and fontspec
loads it automatically.

I'm looking at ways to redefine emphasis within Syriac text (seeing as
slanted text is not traditional or pretty). I've got most of the
redefinitions working, but I'd also like to redefine \emph as an alias
for \aemph in Syriac text. What's the best way of doing that?

Thanks,

Gareth.
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