+------------------SUBJ:V-N-----------------+    
      +------------COMP:N-N(of)-----------+       |    
      +-COMP:N-N(of)+            +MOD_ATT:+       |    
      |             |            |        |       |    
 Interaction of __NODE__ and response elements occurs .
COMP:N-N(of) (Interaction,__NODE__)
COMP:N-N(of) (Interaction,element)
MOD_ATT:N-N (element,response)
SUBJ:V-N (occur,Interaction)