maintaining customized docbook xsl files

I want to provide a mechanism to override the default docbook files
(on case-by-case basis) if needed.

ie:

/my_files/foo.xsl (customized)
/distro/foo.xsl (original)
/distro/bar.xsl (original)

What is the best way to accomplish this?

-- 
Anthony Ettinger
Ph: 408-656-2473
var (bonita, farley) = new Dog;
farley.barks("very loud");
bonita.barks("at strangers");

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