>>>>> "Wendell" == Wendell Piez <wapiez@xxxxxxxxxxxxxxxx> writes:

    Wendell> An obvious use case is to allow a client to switch
    Wendell> stylesheets at the user's request,

Do you mean to select ANY stylesheet, or to choose one from a
pre-selected list?

In the first case, there seems little need for a standard mechanism (a
browser could just add this facility). In the latter case,
xml-stylesheet already supports this.
-- 
Colin Paul Adams
Preston Lancashire