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
    (CLAUSE
      (CORE
        (NP (PRO 0=He))
        (NUC (V 1=wolfed))
        (NP
          (OP-DEF 2=another)
          (CORE_N (AP-PERI (CORE_A (NUC_A (A 3=tasteless)))) (NUC_N (N 4=meal))))
        (PP-PERI
          (CORE_P
            (NUC_P (P 5=in))
            (NP (OP-DEF 6=the) (CORE_N (NUC_N (N 7=canteen)))))))
      (, 8=,))
    (CLAUSE
      (CORE
        (NUC (V 9=hurried) (ADV 10=off))
        (PP
          (CORE_P
            (NUC_P (P 11=to))
            (NP (OP-DEF 12=the) (CORE_N (NUC_N (N-PROP 13=Centre)))))))
      (, 14=,))
    (CLAUSE
      (CORE
        (NUC (V 15=took) (N 16=part))
        (PP
          (P 17=in)
          (NP
            (OP-DEF 18=the)
            (CORE_N
              (AP-PERI (CORE_A (NUC_A (A 19=solemn))))
              (NUC_N (N 20=foolery))
              (PP
                (P 21=of)
                (NP (OP-DEF 22=a) (CORE_N (NUC_N (N 23=discussion) (N 24=group)))))))))
      (, 25=,))
    (CLAUSE
      (CORE
        (NUC (V 26=played))
        (NP
          (CORE_N
            (QP-PERI (CORE_Q (NUC_Q (QNT 27=two))))
            (NUC_N (N 28=games))
            (PP (P 29=of) (NP (CORE_N (NUC_N (N 30=table) (N 31=tennis))))))))
      (, 32=,))
    (CLAUSE
      (CORE
        (NUC (V 33=swallowed))
        (NP
          (CORE_N
            (QP-PERI (CORE_Q (NUC_Q (QNT 34=several))))
            (NUC_N (N 35=glasses))
            (PP (P 36=of) (NP (CORE_N (NUC_N (N 37=gin))))))))
      (, 38=,))
    (CLAUSE
      (CLM 39=and)
      (CORE
        (NUC (V 40=sat))
        (PP-PERI
          (CORE_P
            (NUC_P (P 41=for))
            (NP
              (CORE_N
                (QP-PERI (CORE_Q (NUC_Q (QNT 42=half))))
                (NUC_N (N 44=hour)))
              (OP-DEF 43=an))))
        (PP-PERI
          (CORE_P
            (NUC_P (P 45=through))
            (NP
              (OP-DEF 46=a)
              (CORE_N
                (NUC_N
                  (N 47=lecture)
                  (CORE-PERI
                    (NUC (V-PART 48=entitled))
                    (NP
                      (CORE_N
                        (NUC_N (N-PROP 49=Ingsoc))
                        (PP-PERI
                          (CORE_P
                            (NUC_P (P 50=in))
                            (NP
                              (CORE_N
                                (NUC_N (N 51=relation))
                                (PP
                                  (P 52=to)
                                  (NP (CORE_N (NUC_N (N 53=chess))))))))))))))))))))
  (. 54=.))