[XeTeX] Superscript in Linux Libertine

[Till Rettig]

> On 09/02/2008, at 9:39 PM, Till Rettig wrote:
>
>   
>> I tried recently to set a document with Linux Libertine (O) that  
>> should
>> have old style numbers. Apparently this caused the use of normal old
>> style numbers also for superscript numbers (e.g. for footnotes).
>>     
>
> I would argue that this is a bug in the font, but there's a chance  
> it's XeTeX's fault instead (Jonathan?). Take a look how the font is  
> interpreting the features:
>
> \documentclass{article}
> \usepackage{fontspec}
> \begin{document}
> \fontspec{Linux Libertine O}
> [test 123]
> \fontspec[Numbers=OldStyle]{Linux Libertine O}
> [test 123]
> \fontspec[VerticalPosition=Superior]{Linux Libertine O}
> [test 123]
> \fontspec[Numbers=OldStyle,VerticalPosition=Superior]{Linux Libertine O}
> [test 123]
> \end{document}
>   
This shows it really clearly and what I was suspecting already: old 
style numbers are not mapped to normal superscript numbers. I will 
report it. But about the xetex side: Is there an easy way to have an 
override directly in the code or is it more complicated to implement 
this? I mean exactly what you mention that overrides the font settings 
so that direction rules over variant forms.

Greetings
Till
> Or if you prefer in Plain XeTeX:
>
> \font\x="Linux Libertine O:+onum" at 10pt\x [test 123]
> \font\x="Linux Libertine O:+sups" at 10pt\x [test 123]
> \font\x="Linux Libertine O:+onum,+sups" at 10pt\x [test 123]
> \bye
>
> Perhaps you could report this to the font maintainers? I believe that  
> the sups feature should override the onum feature...
>
> I'm not sure if there's much that xltxtra can do about this, besides  
> adding a feature "\scriptfontfeatures{}" that overrides the features  
> of the main text font. This isn't such a bad idea, actually. I'll work  
> on it at some stage...
>
> Cheers,
> Will
>   
>   
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