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<Paper uid="C86-1008">
  <Title>A TWO-LEVEL DI~ REPRESENTATION 1</Title>
  <Section position="3" start_page="42" end_page="42" type="intro">
    <SectionTitle>
2.4 TRANSACTIONS AND INTERACTIONS
</SectionTitle>
    <Paragraph position="0"> Transactions and interactions are the final two levels of the classification hierarchy.</Paragraph>
    <Paragraph position="1"> Transactions consist of patterns of exchanges, and interactions consist of unordered strings of transactions. Transactions have the following form:</Paragraph>
  </Section>
class="xml-element"></Paper>