> By injecting a zero-width space (​) where you want to allow a 
> line break to happen.  If no line break is needed, there is no visual 
> disturbance.  If a line break is needed, the line breaks at the space.
> 
> For example, you could have the following in XSLT 2.0:
> 
>    replace(replace(.,'(','​('),')',')​')
> 
> ... which injects a zero-width space before each left parenthesis and 
> after each right-parenthesis.

Is there a nice way to do this replace in XSLT 1.0?