adding font-lock rules

[Sven Utcke]

Hi,

I would like to add my own font-look rules to an existing mode along
the lines of:

* in mode xxx, whenever you see yyy, colour it red.
* in mode xxx, whenever you see zzz, colour it blue.

etc --- that is, I do _not_ want to simply introduce new keywords,
which are than coloured with font-lock-keyword-face.  I know how to
write my own mode doing this (including the keyword-face), but how do
I add this to an existing mode?

Thanks

Sven
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