[tex-live] texdoc for libertine

[Bob Tennent]

> For instance, the following MCE seems to be OK

Yes, but try it now with pdflatex :+)

Here are some of the issues I think have to be taken into account with
additional "features":

 + can the feature be implemented for use with latex -> dvips and
   pdflatex as well as xelatex and lualatex?

 + will the feature still be implementable if the upstream fonts change 
   or disappear, as the outline and shadow fonts have?

I've already violated the first principle by providing two of the Glyph
commands (not usable with (pdf)latex), and I suppose that is a precedent
for going further, but if a compatible (pdf)latex implementation were
possible that would be better. At this point I have no idea what
autoinst would do with the Keyboard or Mono fonts.

Bob T.