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<Paper uid="W04-1116">
  <Title>Automatic Semantic Role Assignment for a Tree Structure</Title>
  <Section position="6" start_page="0" end_page="0" type="concl">
    <SectionTitle>
5 Conclusion and Future Works
</SectionTitle>
    <Paragraph position="0"> Semantic roles are determined by the following 4 parameters.</Paragraph>
    <Paragraph position="1">  1. Syntactic and semantic categories of the target word, 2. Case markers, i.e. prepositions and postpositions, 3. Phrasal head, and 4. Sub-categorization frame and its syntactic  We present an automatic semantic roles labeling system. It adopts dependency decision making and example-based approaches, which makes decision on the amount of parameters by observing the occurrence of dependency features and to utilize the minimal amount of feature combinations to assign semantic roles. It labels semantic roles of parsed sentences. Therefore the practical performance of the system depends on a good parser which labels the right structures of sentences. The system achieves 92.71% accuracy in labeling the semantic roles for pre-structure- bracketed texts which is considerably higher than the simple method using probabilistic model of head-modifier relations. In the future, we will consider fine-grain semantic role assignment problems. The current semantic roles assignment is focus on one sentence. However, the occurrences of frame elements are not limited to a single sentence. For instance, &amp;quot;John bought the books from Mary&amp;quot;. The semantic roles of 'John' and 'Mary' are agent and theme respectively.</Paragraph>
    <Paragraph position="2"> According to Fillmore's FrameNet, the frame element assignment for the above sentence should be 'John' the buyer, 'Mary' the seller, 'the books' the goods. The precondition of buy-frame says that the seller should be the owner of the goods.</Paragraph>
    <Paragraph position="3"> Therefore after the sentence parsing and logical reasoning, the following semantic relations should be established.</Paragraph>
    <Paragraph position="4">  The semantic roles assignment is a process of crossing phrasal and sentential boundaries. Some semantic roles of an event might occur at left or right context. Therefore we have to analyze the relation between two consecutive events. The relations include causal relation, temporal relation, resultant relation, etc. How to resolve the above problems will be our future studies.</Paragraph>
  </Section>
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