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<Paper uid="W04-0712">
  <Title>Ellipsis Resolution by Controlled Default Unification for Multi-modal and Speech Dialog Systems</Title>
  <Section position="12" start_page="75" end_page="75" type="concl">
    <SectionTitle>
6 Conclusion and Problems
</SectionTitle>
    <Paragraph position="0"> We presented an approach for the resolution of non-parallel ellipsis by default uniPScation, which is inherently a parallel method. We discussed the dependence of ellipsis interpretation on the state of the dialog in respect to task processing, but also on relation between the informational content of antecedent structures and elliptic structures, which leads to a removal of inforamation, which is up to now not considered in studies on ellipsis. We also addressed the interplay of these dependencies with indications of parallism that are customarily viewed as the main factors of ellipsis interpretation. and We demonstrated how these insights are realized by using default unification as efficient base processing.</Paragraph>
    <Paragraph position="1"> A topic of further research is the relation of general and concrete information. For instance, the ontology shown in figure 1 resembles the ontology used in SmartKom. The location of a cinema is specified by using a common format for addresses, in which country and town are on the same level and the name of the object not directly related to the address. Formally (if groups are already defined) these informations would considered as competing.</Paragraph>
    <Paragraph position="2"> This would prevent the Scala movie theater to be transferred to Saarlouis (in most cases the competition criterion would exclude this possibility, for a certain type of elliptic expression it would recognize an ambiguity). But the criterion would also delete the specification that the Scala cinema is in Saarbr&amp;quot;ucken if the information element Scala is introduced elliptical after asking a question about Saarbr&amp;quot;ucken. This kind of problems is not exclusively a problem of locations.</Paragraph>
    <Paragraph position="3"> + Wo l&amp;quot;auft Matrix? (Where is Matrix on?) + Western? / Wo laufen Western? (Where are western (movies) on The phrase &amp;quot;Western&amp;quot; shows no indications for parallelism, hence the competition criterion would in this case accept the reading that the user is looking for a western named Matrix.</Paragraph>
    <Paragraph position="4"> As a practical solution, we introduced a rule that comprises that names and other &amp;quot;identifiers&amp;quot; of individuals are considered as being more concrete than any other information elements, but further exploration of the problem is necessary.</Paragraph>
    <Paragraph position="5"> Also, the study of larger pieces of dialog as considered here is an important topic of further research. null At several occasions we noticed that anaphoric relations interact with elliptic relation. The interaction of anaphors and ellipsis is another important topic of research.</Paragraph>
  </Section>
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