RRGparbank

To change a label, click on a node to select a different label from a list. The syntactic category and the function tag (before and after the dash "-") must be selected separately by clicking on the corresponding part of the label.
To add a function tag to a node that does not have one yet, drag it from the list of function tags onto the node.
Re-attach a node by dragging and dropping it on a new parent. This can be used to created discontinuous constituents.
Similarly, nodes can be removed and new ones added by dragging to/from below the tree.
Finally, the bracketing can be edited manually in the text box below the tree; press "validate" to update the tree. Whitespace is ignored. Each token must have a dedicated POS tag.

				[...wait for it...]

(SENTENCE
  (CLAUSE
    (CORE
      (NP (PRO 0=It))
      (NUC (V 2=faded))
      (PP-PERI
        (CORE_P
          (NUC_P (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 3=but)))) (P 4=before))
          (CLAUSE
            (CORE
              (NP (CORE_N (NUC_N (N-PROP 5=O'Brien))))
              (NUC (V 7=dropped))
              (NP (OP-DEF 8=his) (CORE_N (NUC_N (N 9=hand)))))
            (OP-TNS 6=had)))))
    (OP-TNS 1=had)
    (. 10=;))
  (CLAUSE
    (CLM 11=but)
    (CLAUSE-PERI
      (CLM 12=though)
      (CORE
        (NP (PRO 13=he))
        (OP-MOD 14=could)
        (OP-NEG 15=not)
        (NUC (V 16=recapture))
        (NP (PRO 17=it)))
      (, 18=,))
    (CORE
      (NP (PRO 19=he))
      (OP-MOD 20=could)
      (NUC (V 21=remember))
      (NP (PRO 22=it))
      (PP-PERI
        (, 23=,)
        (CORE_P
          (NUC_P (P 24=as))
          (CLAUSE
            (CORE
              (NP (PRO 25=one))
              (NUC (V 26=remembers))
              (NP
                (OP-DEF 27=a)
                (CORE_N
                  (AP-PERI (CORE_A (NUC_A (A 28=vivid))))
                  (NUC_N (N 29=experience))
                  (PP-PERI
                    (CORE_P
                      (NUC_P (P 30=at))
                      (NP
                        (OP-DEF 31=some)
                        (CORE_N
                          (NUC_N
                            (N 32=period)
                            (CLAUSE-PERI
                              (PrCS (ADVP-REL (ADV-REL 37=when)))
                              (CORE
                                (NP (PRO 38=one))
                                (NUC
                                  (AUX-TNS 39=was)
                                  (NP
                                    (OP-DEF 42=a)
                                    (CORE_N
                                      (AP-PERI
                                        (CORE_A (NUC_A (A 43=different))))
                                      (NUC_N (N 44=person)))))
                                (PP-PERI
                                  (CORE_P
                                    (NUC_P (P 40=in))
                                    (NP (CORE_N (NUC_N (N 41=effect)))))))))
                          (PP
                            (P 33=of)
                            (NP
                              (NPIP (NP (PRO 34=one) (POS 35='s)))
                              (CORE_N (NUC_N (N 36=life)))))))))))))))))
  (. 45=.))