character maps

Hello group,

 

Can somebody explain to me what a character map is?

 

I’m trying to replace some ascii characters
with Unicode charcters, and I think I should use a character map.

 

Can somebody give me an example?

DoI use man.string.subst.map
for that?

 

Btw, I use xsltproc and fop 0.9

 

Thanks,

            Hinrich