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<Paper uid="P98-1090">
  <Title>Long Distance Pronominalisation and Global Focus</Title>
  <Section position="9" start_page="554" end_page="555" type="relat">
    <SectionTitle>
5 Related Work
</SectionTitle>
    <Paragraph position="0"> In a recent paper, Hahn and Strube (1997) propose to extend centering theory with what is, essentially, Sidner's stack of discourse foci, although their algorithm for identifying the ce is not identical to Sidner's. Their analysis of German texts shows a rather good performance for their algorithm, but, as only MSEs are predicted to be accessible, none of the anaphors depending on focus space information could be resolved. Their algorithm also appears to treat definite descriptions and pronouns uniformly as 'anaphors', which seems problematic in the light of psychological evidence showing that they behave differently, and examples like the following: (7) a. John/saw Mary. He/greeted her.</Paragraph>
    <Paragraph position="1"> b. John/saw Mary. ??The mani greeted her.</Paragraph>
    <Paragraph position="2"> (Guindon, 1985) proposed an alternative model of the attentional state involving a cache instead of a stack, and Walker (1996) argues that the cache model can account for all of the data that originally motivated the stack model and, in addition, explains the use of informationally redundant utterances. The cache model isn't yet specified in enough detail for all of its implications for the data discussed here to be clear, but it appears that some of the issues discussed in this paper would have to be addressed in a cache model as well, and that some of our conclusions would apply in a model of that type as well. In particular, these proposals are not very specific about whether the cache should count as a replacement of just the global focus component of G&amp;S's theory or of both local and global focus, and about what should go in the cache-Guindon seems to assume that it's discourse entities, whereas Walker also seems to allow for propositions and relational information. If the cache was intended as an alternative model of the global focus component, the data discussed here could be  taken as an argument that what goes in the cache should be focus spaces with distinguished MSEs.</Paragraph>
  </Section>
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