[XeTeX] Ligatures

[Khaled Hosny]

On Sun, Jun 02, 2013 at 11:53:00AM +0200, Jean-Claude Raoult wrote:
> The documentation is clear, for people using LaTeX or rather XeLaTeX.

Presumably because you were reading LaTeX oriented documentation? XeTeX
documentation itself documents the low level primitives and is macro
package neutral, though it is a bit anæmic.

> I tried to adapt the doc, and write
> \font\truc="Linux Libertine O:mapping=tex-text:Ligatures=RareLigatures"
> or instead of RareLigatures: Rare Ligatures or Historical. Nothing worked.

OpenType features are accessed using 4-letter tag names, documenting
those tags is beyond XeTeX documentation since they are part of the
OpenType standard:

	http://www.microsoft.com/typography/otspec/featurelist.htm

XeTeX just passes whatever tag you give to the OpenType layout engine.

Regards,
Khaled