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<Paper uid="T78-1005">
  <Title>amp;quot;A System for Representing and Using '</Title>
  <Section position="7" start_page="39" end_page="40" type="concl">
    <SectionTitle>
8. Conclusion
</SectionTitle>
    <Paragraph position="0"> In situation recognition, the nodes of a taxonomic lattice structure serve as rendezvous points where footprints from various constituent elements of a concept can meet. This facilitates the detection of coincidences of related events, which in many cases will not be suggestive in isolation. The implementation of the kinds of operations described above involves a system of marker passing conventions for propagating the various &amp;quot;footprints&amp;quot; around the network, detecting coincidences, creating instance nodes, and propagating further markers when coincidences are found. A major portion of our current research involves the discovery of effective conventions for such marker passing operations. Other issues include working out conventions for how far markers should propagate (amounting to decisions as to where to rendezvous), deciding how much information a mark carries with it and to what extent marks are inherited, developing ways to allow a node to remember partial  intersections of marks in such a way that it can incrementally extend them as additional marks accumulate, identifying implications of the marker passing strategies on representational conventions, etc.</Paragraph>
  </Section>
class="xml-element"></Paper>