What you need to do is to identify a piece of content as "description of John Dor" and then link to Document 2 and 3 to include "description of John Dor".
We normally do this sort of thing in WCM with XML and HTML documents. There's several options there including in 3.3 the new Web Forms Editor and possibly the rendition service.
For the DM side of things, that's something we will be tackling at some point.
That's not to say that there will not be other approaches based on the existing capabilities of rules and transformers.