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<Paper uid="W06-0306">
  <Title>Searching for Sentences Expressing Opinions by using Declaratively Subjective Clues</Title>
  <Section position="8" start_page="45" end_page="45" type="concl">
    <SectionTitle>
5 Conclusion and Future Work
</SectionTitle>
    <Paragraph position="0"> We proposed a method of extracting sentences classified by an SVM as opinion-expressing that uses feature sets of declaratively subjective clues collected from opinion-expressing sentences in Japanese web pages and semantic categories of words obtained from a Japanese lexicon. The first experiment showed that our method performed better than baseline methods. The second experiment suggested that our method performed better when extraction of features was limited to the predicate part of a sentence rather than allowed anywhere in the sentence. The last experiment showed that using both declaratively subjective clues and semantic categories as feature parameters yielded better results than using either clues or categories exclusively.</Paragraph>
    <Paragraph position="1"> Our future work will attempt to develop an open-domain opinion web search engine. To succeed, we first need to augment the proposed opinion-sentence extraction method by incorporating the query relevancy mechanism. Accordingly, a user will be able to retrieve opinion-expressing sentences relevant to the query. Second, we need to classify extracted sentences in terms of emotion, sentiment, requirement, and suggestion so that a user can retrieve relevant opinions on demand. Finally, we need to summarize the extracted sentences so that the user can quickly learn what the writer wanted to say.</Paragraph>
  </Section>
class="xml-element"></Paper>