RRGbank

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.

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(SENTENCE
  (CLAUSE
    (CORE
      (CORE
        (NP (CORE_N (NUC_N (N-PROP 6=Hills) (N-PROP 5=Mrs.))))
        (NP
          (CORE_N (NUC_N (N 3=act) (N 2=trade)) (QP (CORE_Q (NUC_Q (QNT 1=1988)))))
          (OP-DEF 0=The))
        (NUC (V 4=requires)))
      (CORE
        (PP-PERI
          (CORE_P
            (NUC_P (P 17=by))
            (NP
              (CORE_N
                (NUC_N (N-PROP 18=April))
                (QP (CORE_Q (NUC_Q (QNT 19=30))))))))
        (NP
          (CORE_N
            (NUC_N (N 10=review))
            (PP-PERI
              (CORE_P
                (NUC_P (P 11=of))
                (NP
                  (CORE_N
                    (NUC_N (N 13=performance))
                    (PP-PERI
                      (CORE_P
                        (NUC_P (P 14=of))
                        (NP (CORE_N (NUC_N (N 16=countries))) (OP-DEF 15=these)))))
                  (OP-DEF 12=the)))))
          (OP-DEF 9=another))
        (CLM 7=to)
        (NUC (V 8=issue)))
      (. 20=.))))

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Supertags

	token	arc	supertag
1	The	4	(NP* (OP-DEF <>))
2	1988	4	(CORE_N* (NP-PERI (CORE_N (NUC_Q (QNT <>)))))
3	trade	4	(NUC_N* (N <>))
4	act	5	(NP (CORE_N (NUC_N (N <>))))
5	requires	0	(SENTENCE (CLAUSE (CORE (NP ) (NUC (V <>)) (NP )) (CORE )))
6	Mrs.	7	(NUC_N* (N-PROP <>))
7	Hills	5	(NP (CORE_N (NUC_N (N-PROP <>))))
8	to	9	(CORE* (CLM <>))
9	issue	5	(CORE (NUC (V <>)) (NP ))
10	another	11	(NP* (OP-DEF <>))
11	review	9	(NP (CORE_N (NUC_N (N <>)) (PP )))
12	of	11	(PP (P <>) (NP ))
13	the	14	(NP* (OP-DEF <>))
14	performance	12	(NP (CORE_N (NUC_N (N <>)) (PP )))
15	of	14	(PP (P <>) (NP ))
16	these	17	(NP* (OP-DEF <>))
17	countries	15	(NP (CORE_N (NUC_N (N <>))))
18	by	9	(CORE* (PP-PERI (CORE_P (NUC_P (P <>)) (NP ))))
19	April	18	(NP (CORE_N (NUC_N (N-PROP <>))))
20	30	19	(CORE_N* (QP (CORE_Q (NUC_Q (QNT <>)))))
21	.	0	(SENTENCE (. <>))