DOCBOOK: Markup problem

Any suggestions for markup please.
I couldn't find an easy answer in tdg.



>My specific concern is documenting the options in the XF86Config file.
>
>The format is something like:
>      Option      "MCKL"
>
>Is the whole thing a literal?
>Is just MCLK a literal?
>Or are they constants?
>Is it <screen> for the whole thing?
>Is it <programlisting> for the whole thing?
>Is it <literallayout> for the whole thing?
>Is it an inline for the whole thing?

Regards DaveP