DPOCL: A Principled Approach to Discourse Planning
  Research in discourse processing has identified two representational requirements for discourse planning systems. First, discourse plans must adequately represent the intentional structure of the utterances they produce in order to enable a computational discourse agent to respond effectively to communicative failures \cite{MooreParisCL}. Second, discourse plans must represent the informational structure of utterances. In addition to these representational requirements, we argue that discourse planners should be formally characterizable in terms of soundness and completeness. 
R. Michael Young (Intelligent Systems Program, University of   Pittsburgh) and Johanna D. Moore (Department of Computer Scie...