[xsl] Maintaining XSL ...

Hello,

I use several XSL files to do translations of xml data. Basically we use
the xsl to house the business logic and generate the presentations of
the data as html. Does anyone have
good methods on how to make the xsl layer more readable and
maintainable. We have people
who try to customize the "look and feel" of the application on the field
and their feedback
is that xsl is *hard* to work with. We need a way to use xsl to generate
the presentation
layer but still provide an easy way for users to customize the generated
presentation.

Help and comments appreciated.

Thanks

Regards
- Asit