Perhaps you should specify exactly what kind of customisation you want
to do. Normally it is easier to customise by defining higher priority
rules rather than by trying to have a private mode that you use for
customisation.

To customise Norm's stylesheets you can import the originals and then
redefine any templates you want. import precedence and/or priority
should arrange that any redefined templates of yours are triggered, but
for elements that you have not redefined a template the original
processing will occur.

Certainly this does not cover all possibilities, but if you could give
an example of a specific type of customisation that you need, that isn't
handled by this, perhaps someone could suggest something?

David


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