[XeTeX] XeLaTeX and SIunitx

[Tobias Schoel]

On 11.05.2012 19:44, Bruno Le Floch wrote:
> On 5/11/12, Joseph Wright<joseph.wright at morningstar2.co.uk>  wrote:
>> On 11/05/2012 17:36, Tobias Schoel wrote:
>>> Hi,
>>>
>>> I have done a few tests with the problematic symbols in siunitx (namely
>>> micro, ohm, angstrom, celsius, degree/arcsecond/arcminute) and different
>>> math fonts. You'll find source and result attached. As I don't have
>>> access to commercial fonts (which includes MS Fonts), I could only test
>>> some of them. The results aren't overwhelming.
>>>
>>> Is it possible and acceptable to include a package option or
>>> sisetup-option which makes the suitable definitions? It shouldn't be
>>> default, even when loading fontspec in xetex, but easily accessible.
>>>
>>> Thanks
>>>
>>> bye
>>>
>>> Tobias
>>
>> As the siunitx documents state, there are simply too many combinations
>> of font packages to hope to cover all of them 'out of the box' or indeed
>> in the documentation, especially as XeLaTeX and LuaLaTeX users may be
>> loading /any/ system font. Furthermore, the package code has to work
>> with pdfTeX, so it cannot contain UTF-8 characters outside of the ASCII
>> range.
>>
>> As such, I can only make general recommendations in the documentation on
>> what to do to print these symbols correctly when using UTF-8 engines.
>
> I'm really no expert, but the siunitx package could include, e.g., µ
> as ^^^^00b5.  This  would not make pdftex choke when appearing in the
> false branch of an engine-dependent conditional.

Could unicode-math-symbols be used? Can one load a package only 
dependent on engine?
\ifxetex\usepackage{unicode-math-symbols}\fi
?
>
> Regards,
> Bruno
>
>
>
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