>It is reasonable to want to add capabilities to, say, a web server, in
>a backward compatible way so that, say, a legacy content server can
>still be used. Later a new content server can be deployed that
>responds to the new capabilities. Conversely, we might want to augment
>the content server with additional information that will later be used
>by an upgraded web server.

Isn't this precisely the sort of problem that extensible data interchange
formats such as XML are intended to solve? 

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