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<Paper uid="W00-1007">
  <Title>Abstract Anaphora Resolution in Danish</Title>
  <Section position="3" start_page="56" end_page="57" type="intro">
    <SectionTitle>
2 Centering
</SectionTitle>
    <Paragraph position="0"> In GJW95 the entities which link an utterance Un to the others in the same discourse segment are the centers of that utterance. Each utterance is assigned a set of forward-looking centers, Cf, and, with the exception of the initial utterance of the segment, a backward-looking center, Cb. The Cb of an utterance Un connects with one of the forward-looking centers of the preceding utterance Un-1 while the forward-looking centers only depend on the expressions in Un. The forward-looking centers are partially ordered to reflect relative prominence. GJW95 recognize three types of transition relation across pairs of utterances: continue, retain and shift (see table 1).</Paragraph>
    <Paragraph position="1"> Center movement and realization are constrained by two rules: Rule I: If any element of CCf(U~-i) is realized by a pronoun in Un, then Cb(Un) must also be realized by a pronoun Rule 2: Center continuation is preferred to center retaining which is preferred to center shifting</Paragraph>
    <Section position="1" start_page="56" end_page="57" type="sub_section">
      <SectionTitle>
2.1 Functional Centering
</SectionTitle>
      <Paragraph position="0"> In $98 the functions of the backward-looking center and the transitions in the centering theory are replaced by the order of elements in a list of salient discourse entities, the Slist. The ranking criteria for the elements in the S-list are based on (Prince, 1981), where discourse entities are classified into hearer-old (OLD), mediated (MED) and hearer-new (NEW). The two tuples (x, Uttx, posx) and (y, utty, posy) in the S-list indicate that the entity x is evoked in utterance uttx at position posx and that y is evoked in utterance utty at position posy respectively. Given that Uttx and utty refer to Un or Un-1, the follow-</Paragraph>
    </Section>
  </Section>
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