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Discourse Structure and the Structure of Context - Multiple Choices

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4<br />

The dynamic <strong>the</strong>ory which will serve as <strong>the</strong> formal background for <strong>the</strong><br />

present paper, <strong>Discourse</strong> Representation Theory (or DRT, for short),<br />

goes fur<strong>the</strong>r in emphasising <strong>the</strong> representational status <strong>of</strong> discourse<br />

contexts. The discourse context for sentence Sk from <strong>the</strong> discourse is assumed to be identical with <strong>the</strong> semantic representation that<br />

results from interpreting . This assumption <strong>of</strong> <strong>the</strong> identity<br />

<strong>of</strong> discourse context <strong>and</strong> content representation has sometimes been<br />

referred to as <strong>the</strong> ''unity <strong>of</strong> context <strong>and</strong> content'' 3 .<br />

Even from <strong>the</strong> little that has been said here so far it should be clear that<br />

a <strong>the</strong>ory <strong>of</strong> natural language interpretation <strong>and</strong> meaning which<br />

incorporates those aspects <strong>of</strong> context-dependence that are now<br />

reasonably well understood mustz incorporate reference to both<br />

utterance context <strong>and</strong> discourse context. (Think <strong>of</strong> any sentence which<br />

contains both I <strong>and</strong> a third person pronoun referring to someone who<br />

has been mentioned one sentence before.) But how can notions <strong>of</strong><br />

context as different as utterance context <strong>and</strong> discourse context be<br />

incoroprated into a single notion <strong>of</strong> context, which allows us to account<br />

for both kinds <strong>of</strong> context dependence in a cogent, unified way?<br />

Especially <strong>the</strong> second difference between utterance context <strong>and</strong><br />

discourse context we noted, may well be seen as an obstacle.<br />

However, <strong>the</strong> problem is not as forbidding as could have been thought.<br />

In fact, a partial solution <strong>of</strong> sorts has been around within DRT almost<br />

since its inception. Such a solution was urgently needed form <strong>the</strong> start<br />

because <strong>of</strong> DRT's emphatic concern with <strong>the</strong> semantics <strong>of</strong> tense <strong>and</strong><br />

temporal adverbs, in which cross-sentential anaphora <strong>and</strong> indexicality<br />

usually act in t<strong>and</strong>em. To mention just one example, <strong>the</strong> simple past<br />

tense in simple sentences is indexical in that it locates <strong>the</strong> desribed<br />

event or state in <strong>the</strong> past <strong>of</strong> <strong>the</strong> utterance time. But in non-initial<br />

sentences event location also tends to have an anaphoric aspect ins<strong>of</strong>ar<br />

The first sentences <strong>of</strong> (1.a) <strong>and</strong> (1.b) both state that Fred owns at least one car. but<br />

<strong>the</strong> pronooun it in <strong>the</strong> second sentence is entirely felicitous in <strong>the</strong> case <strong>of</strong> (1.a). In<br />

(1.b) <strong>the</strong> use <strong>of</strong> it is highly marked, <strong>and</strong> for some speakers not really acceptable.<br />

3 For introductions to DRT see (Kamp, 1981), (Gamut, ??), (Kamp & Reyle, 1993),<br />

(Blackburn & Bos, ??), (Van Genabith et al. 2004). Closely related to DRT q<strong>and</strong> dating<br />

from roughly <strong>the</strong> same time is Heim's File Change Semantics, (Heim. 1982). (While<br />

<strong>the</strong> two developments were independent, <strong>the</strong> first formulation <strong>of</strong> FCS antedates that <strong>of</strong><br />

DRT by roughly a year.) The original formulations <strong>of</strong> DRT <strong>and</strong> FCS make <strong>the</strong> same<br />

predications, but FCS never took <strong>the</strong> representationsal stance which DRT adopted<br />

from <strong>the</strong> beginning.

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