While there are a number of different relation taxonomies (Hobbs, 1979;McKeown, 1985;Mann and Thompson, 1988;Martin, 1992;Knott and Sanders, 1998), many researchers have found that, despite small differences, these theories have wide agreement in terms of the core phenomena for which they account (Hovy and Maier, 1993;Moser and Moore, 1996).
we would like to make our patterns recognize that some sentence boundaries indicate merely an orthographic break without a switch in topic, while others can separate quite distinct topics.