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<Paper uid="C04-1018">
  <Title>Playing the Telephone Game: Determining the Hierarchical Structure of Perspective and Speech Expressions</Title>
  <Section position="7" start_page="0" end_page="0" type="concl">
    <SectionTitle>
6 Conclusions and Future Work
</SectionTitle>
    <Paragraph position="0"> We have presented the concept of perspective and speech expressions, and argued that determining their hierarchical structure is important for natural language understanding of perspective. We have shown that identifying the hierarchical structure of pse's is amenable to automated analysis via a machine learning approach, although there is room for improvement in the results.</Paragraph>
    <Paragraph position="1"> In the future, we plan to address the related tasks discussed in Section 2, especially identifying pse's and their immediate sources. We are also interested in ways of improving the machine learning formulation of the current task, such as optimizing the binary classifier on the whole-sentence evaluation, or defining a different binary task that is easier to learn. Nevertheless, we believe that our results provide a step towards the development of natural language systems that can extract and summarize the viewpoints and perspectives expressed in text while taking into account the multi-stage information filtering process that can mislead more na&amp;quot;ive systems.</Paragraph>
  </Section>
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