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<Paper uid="P84-1078">
  <Title>Controlling Lexical Substitution in Computer Text Generation 1</Title>
  <Section position="3" start_page="0" end_page="0" type="intro">
    <SectionTitle>
2. Cohesion
</SectionTitle>
    <Paragraph position="0"> The purpose of communication is for one person (the speaker or writer) to express her thoughts and ideas so that another (the listener or reader) can understand them. \]here aJe many restrictions placed on the realization of these thoughts inio language so that the listener may understand. One ot the most important requiroments fo~ an utterance is that it seem to be unified, that it form a text. The theory of text and what distinguishes it from isolated sentences that is used in Paul is that of Halliday and Hasan \[3\].</Paragraph>
    <Paragraph position="1"> One of the items that enhances the unity of text is cohesion.</Paragraph>
    <Paragraph position="2"> Cohesion refers to the linguistic phenomena that establish relationships between sentences, thc~reby tying them together. There are two major goals that are accomplished tl~rougi~ cohesiu, that enhance a passage's qualily of text. The fiust is the obwous oesure to avoid unnecessary repetibon. The other goal is to dislinguL&amp;quot;,h new information from old. ,so that the listener can tully undemtand what fs being said.</Paragraph>
    <Paragraph position="3"> \[1} The room has a large window, The room has a window facing east.</Paragraph>
    <Paragraph position="4"> {1} appears to he describing two windows, because there is no device indicating that the window of the second sentence is the same as the window of tile first sentence. If in tact the speaker me:mr to describe the stone w;ndow, silo must somehow inform the listener that this is  03374.04 from the National Library of Medicine.</Paragraph>
    <Paragraph position="5"> indeed the case. Cohesion us a device that will accomplish thas goal, Cohesion is created when the interpretation of an element is dependent on the me.aning of another. \]he element in guestion can.at be hJIly understood until 1he element d is dependenl on zs ~dcntdned. rhe first presupposes \[3\] the second in that it requ,es for its understanding the exnstence of the second. An element at a sentence presupposes the existence of another when its interpretation requires relerence tO another. Once we can trace these lelerences to their sources, we can correctly interpret the elements of the sentences.</Paragraph>
    <Paragraph position="6"> The very same devices that create these depende, leies for interpretation help distinguish olct intolrnation from new. I\[ the use of a cohesive element pre~.upposes the exnste~ce of another role=once el the element lor its ir}terpretahon, tl~en tile hstener can be assured tltat the olher reference exists, and that the element =n question can be understood as old reformation. lhurefore, that act at associating seJltences through reference deponde.cies heips make the text unambiguous, arid cohcs=on can be seen to be a very important part of text.</Paragraph>
  </Section>
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