Open Access

Michael Grabski

• The paper starts with a semantic differentiation between the notions of sentence topic and discourse topic. Sentence topic is conceived of as part of a semantic predication in the sense of Y. Kim's work. Discourse topic is defined, as in N. Asher's Segmented Discourse Representation Theory, as a discourse constituent that comprises the content of (part of) the larger discourse. The main body of the paper serves to investigate the intricate connection between the two types of topic. For restricting the context of investigation, a specific relation between discourse constituents, Elaboration, is chosen. If Elaboration holds between two discourse constituents, one of them can be identified as the explicit discourse topic with respect to the other one. Whereas an elaborating sentence - with or without a sentence topic - is used to infer a 'dimension' for extending the discourse topic, the role of the sentence topic if it occurs is to mark an 'index' for predication along that dimension. The interaction of elaborating sentences and their topics is modelled by means of channel theoretic devices.'