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<Paper uid="P98-2142">
  <Title>Integrated Control of Chart Items for Error Repair</Title>
  <Section position="4" start_page="865" end_page="866" type="metho">
    <SectionTitle>
3 Discussion
</SectionTitle>
    <Paragraph position="0"/>
    <Section position="1" start_page="865" end_page="865" type="sub_section">
      <SectionTitle>
3.1 Syntactic Level Problems
</SectionTitle>
      <Paragraph position="0"> The grammar rules need extension to cover the following grammatical phenomena: compound nouns and adjectives, gerunds, TO+VP, conjunctions, comparatives, phrasal verbs and idiomatic sentences. For example, 'in the morning' and 'at midnight' are well-formed phrases. However, CHAPTER currently also parses 'in morning', 'in the midnight', and 'at morning' as well-formed.</Paragraph>
      <Paragraph position="1"> CHAPTER uses prioritised search to detect and correct syntactic errors using the penalty scores of goals. However, the scheme for selecting the best repair did not uncritically use the first detected error found by the prioritised search at the syntactic level, because the best repair might be ill-formed at the semantic level. In fact, the prioritised search strategy did not contribute to the selection scheme, which depended solely on the error type and the importance of the repaired constituent in its local tree.</Paragraph>
    </Section>
    <Section position="2" start_page="865" end_page="866" type="sub_section">
      <SectionTitle>
3.2 Semantic Level Problems
</SectionTitle>
      <Paragraph position="0"> At present in CHAPTER's semantic system, the most complex problem is the processing of prepositions, and their conceptual definition.</Paragraph>
      <Paragraph position="1"> For example, the preposition 'for' can indicate at least three major concepts: time duration (for a week), beneficiary (for his mother), and purpose (for digging holes). If for takes a gerund object, then the concept will specify a purpose or reason (e.g. It is a machine for slicing bread).</Paragraph>
      <Paragraph position="2"> In addition, the act templates do not allow multiple optional conceptual cases (i.e.</Paragraph>
      <Paragraph position="3"> relational conceptual cases - LOC for Ideational concepts, and DEST for destination concepts, etc.) for prepositional and adverbial phrases. This would increase the number of templates and the computational cost. If there is more than one verbal adjunct (PPs and ADVPs) in a sentence, then CHAPTER does not interpret all adjuncts.</Paragraph>
    </Section>
  </Section>
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