PPLRE Research Topics - Ternary Relations

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  • Synopsis: Recent research has focused on unary relationships and on binary relationships such as Composer(C) and OrgHeadquarterLocation(O,L). N-ary Relations however are commonplace, for example Event Relations typically unite two Concepts with a Temporal Relation. The PPLRE task also happens to be a ternary relation, OPL(). And although it can be divided into two binary relations, a unified approach would have access to more information. Ideas for identifying N-ary Relations in one step is to identify patterns in a Text Graph.


  • Currently we ourselves have broken the task down into a search for the two binary relationships of OP() and PL().
  • There are examples (below) where one ternary pattern appears to be simpler to acquire than two binary patterns.


  • PPLRE Corpus 80.a.0: Cytochrome c3(PROTEIN), a small (14-kDa) soluble tetraheme protein was isolated from the periplasmic fraction(LOCATION) of Desulfovibrio desulfuricans(ORGANISM) strain Essex 6.

  • A ternary Dependency Grammar Pattern could be:
    • PROTEIN <=(nsubjpass)<=isolated=>(prep_from) =>LOCATION=>prep_of=>ORGANISM.
    • Notice that the path between the organism and the protein involves the location. Therefore this pattern could extract the ternary relation at once.