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
      (NP (PRO 0=They))
      (NUC (V 1=cite))
      (NP
        (OP-DEF 2=a)
        (CORE_N
          (NUC_N (N 3=lack))
          (PP
            (CORE_P
              (NUC_P (P 4=of))
              (NP
                (CORE_N
                  (`` 5=``)
                  (NP
                    (CORE_N
                      (NUC_N
                        (N 6=imbalances)
                        ('' 7='')
                        (CLAUSE-PERI
                          (PrCS (NP-REL (PRO-REL 8=that)))
                          (CORE
                            (NUC (V 9=provide))
                            (NP
                              (CORE_N
                                (AP-PERI (CORE_A (NUC_A (A 10=early))))
                                (NUC_N (N 11=warning) (N 12=signals))
                                (PP
                                  (CORE_P
                                    (NUC_P (P 13=of))
                                    (NP
                                      (OP-DEF 14=a)
                                      (CORE_N (NUC_N (N 15=downturn)))))))))))))))))))
      (. 16=.))))

Supertags

	token	arc	supertag
1	They	2	(NP (PRO <>))
2	cite	0	(SENTENCE (CLAUSE (CORE (NP ) (NUC (V <>)) (NP ))))
3	a	4	(NP* (OP-DEF <>))
4	lack	2	(NP (CORE_N (NUC_N (N <>)) (PP )))
5	of	4	(PP (CORE_P (NUC_P (P <>)) (NP )))
6	``	7	(CORE_N* (`` <>))
7	imbalances	5	(NP (CORE_N (NP (CORE_N (NUC_N (N <>))))))
8	''	7	(NUC_N* ('' <>))
9	that	10	(NP-REL (PRO-REL <>))
10	provide	7	(NUC_N* (CLAUSE-PERI (PrCS (NP-REL )) (CORE (NUC (V <>)) (NP ))))
11	early	13	(CORE_N* (AP-PERI (CORE_A (NUC_A (A <>)))))
12	warning	13	(NUC_N* (N <>))
13	signals	10	(NP (CORE_N (NUC_N (N <>)) (PP )))
14	of	13	(PP (CORE_P (NUC_P (P <>)) (NP )))
15	a	16	(NP* (OP-DEF <>))
16	downturn	14	(NP (CORE_N (NUC_N (N <>))))
17	.	2	(CORE* (. <>))