Guenter Milde schrieb:

> The names are transformed to conform to the regular expression
> [a-z](-?[a-z0-9]+)* by converting
> 
>     * alphabetic characters to lowercase,
>     * accented characters to the base character,
>     * non-alphanumeric characters to hyphens,
>     * consecutive hyphens into one hyphen.
> 
> There seems to be a non-documented behaviour:
> 
>     * non-alphanumeric characters are converted to hyphens if they occure
>       in the middle of the name and stripped from the start or end.
> 
> So, _foo or :ref:`foo` should work (as long as there is no other
> hyperlink targed called foo).

:ref: refers to explicit labels only, and it doesn't seem to work with
them (at least, the following doesn't):

.. _<abc>:

Foo
===

Referencing abc_.


Georg

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