Style overlays?

A recent suggestion on another list seemed to 
imply that it might be possible to cascade styles
in XSL as is done in CSS.

My immediate reaction was no, but I was asked
to check prior to answering.

Can anyone see how this might be achieved with
todays (or tomorrows) technology?

The principle being as per CSS, that a recipients
style might override a default etc. etc.

The source was a WAI list looking at braille
style sheets.

TIA
regards, DaveP


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