Am 10.04.2015 um 11:51 schrieb <joasyannick@gmail.com> <joasyannick@gmail.com>:

Dear everyone,

I am writting a French document.
I would like to turn off the French character spacing temporarily in order to
typeset English document title or URL. For instance, I would like to define the commands

\def\englishtitle#1{\turnofffrenchcharacterspacing{\em #1}\turnonfrenchcharacterspacing}
\def\url#1{\turnofffrenchcharacterspacing{\em #1}\turnonfrenchcharacterspacing}

You can use the \resetcharacterspacing command to disable the spacing.

\setcharacterspacing[frenchpunctuation]

\definestartstop

[EnglishTitle]

[commands=\resetcharacterspacing,

style=italic]

\starttext

text: «text» \EnglishTitle{text: «text»}

\stoptext

so that a title link “Example: English Title” will be italicised and will not have a space before “:”;
and a URL like “http://www.example.com” neither.