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  The utterance tags all indicate some particular aspect of the utterance
  unit itself, summarizing the intentions of the speaker (i.e., why the
  utterance was spoken) and the content of the utterance. These tags can be
  classified into four main categories:
  
  
-  Communicative Status - records whether the utterance is intelligible
    and whether it was successfully completed.
  
-  Information Level - a characterization of the semantic content of the
    utterance.
  
-  the Forward Looking Function - how the current utterance constrains
    the future beliefs and actions of the participants, and affects the
    discourse.
  
-  the Backward Looking Function - how the current utterance relates to
    the previous discourse.
  
   
  Note that utterances do not need to always have a component at each level.
  For instance, some utterances may have no Forward Looking Function, while
  others might have no Backward Looking Function.
  
  
  
 
  
  
 
  
  Mark Core 
  Mon Sep 22 20:05:25 EDT 1997