[XeTeX] XeLaTeX and SIunitx

[Zdenek Wagner]

2012/5/12 Tobias Schoel <liesdiedatei at googlemail.com>:
>
>
> 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
>
AFAIK there are four unicode math fonts:

Cambria Math (commercial)
Asana Math
XITS
Neo Euler

How theengine-only switch could recognize which fonts do you wish to
use? Moreover \Omega in the math sense must be typeset in math italic
while as a unit (Ohm) it must be upright and may be taken from any
font containing Greek. It would be better to have a unicode SI units
package that will allow users to select a font they like.

> ?
>>
>>
>> Regards,
>> Bruno
>>
>>
>>
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-- 
Zdeněk Wagner
http://hroch486.icpf.cas.cz/wagner/
http://icebearsoft.euweb.cz