(IP 
  (NP-SBJ 
    (DP 
      (DT 该))
                    
    (NP 
      (NN 信件)))
                    
  (VP 
    (VC 是)
                    
    (NP-PRD 
      (CP 
        (WHNP-2 
          (-NONE- *OP*))
                    
        (CP 
          (IP 
            (NP-SBJ 
              (-NONE- *pro*))
                    
            (VP 
              (PP-LOC 
                (P 在)
                    
                (NP 
                  (NP 
                    (DP 
                      (DT 该))
                    
                    (NP 
                      (NN 囚犯)))
                    
                  (NP 
                    (NN 面前))))
                    
              (VP 
                (VP 
                  (VV 开启)
                    
                  (NP-OBJ 
                    (-NONE- *RNR*-3)))
                    
                (CC 和)
                    
                (VP 
                  (VV 搜查)
                    
                  (NP-OBJ-3 
                    (-NONE- *T*-2))))))
                    
          (DEC 的))))))
arg0: 
                    *pro* 
                
arg1: 
                    *T*-2 
                
argm: 
                    在 该 囚犯 面前 
                

(PP-TMP 
  (P 在)
                    
  (LCP 
    (IP 
      (NP-SBJ 
        (DP 
          (DT 该))
                    
        (NP 
          (NN 信件)))
                    
      (VP 
        (VP 
          (VV 开启))
                    
        (CC 和)
                    
        (VP 
          (VV 搜查))))
                    
    (LC 时)))
arg1: 
                    该 信件