The initial inspiration for the SDRs was provided by the Rhetorical Structure Theory (RST) of Mann & Thompson [1<cite>5,</cite> 16] . Rhetorical Structure Theory-which was initially developed in the context of "computational text generation" 3 [1<cite>5,</cite> 16, 22] -is trying to connect several units of analysis with relations that are semantic in nature and are supposed to capture the intentions of the author.