Nested frames

Due to the recursive nature of phrases, the frames transduced from them may be nested, e.g. (omitting the types):

IBM sponsored this conference
$\Rightarrow$
[IBM,[sponsored,conference]]

this conference was sponsored by IBM
$\Rightarrow$
[IBM,[sponsored,conference]]

Every PhD student gets a reduced price for the ETAP conference
$\Rightarrow$
[[student,PhD],[get,[price,reduced|for [conference,ETAP]]]]

Notice the transformation from passive to active voice in the second example. Nested frames can be unnested using a component included with the grammar, the unnester, which for the last example yields

  [N:student,N:PhD][N:student,V:gets]
  [V:gets,N:price] [P:it,V:reduced]
  [V:reduced,N:price][N:price,
  for N:conference][N:conference,N:ETAP]