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 (OP-DEF 0=That) (CORE_N (NUC_N (N 1=early-morning) (N 2=breather))))
      (NUC
        (AUX-TNS 3=is)
        (NP
          (CORE_N
            (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 4=just))))
            (CD 5=one)
            (PP
              (CORE_P
                (NUC_P (P 6=of))
                (NP
                  (OP-DEF 7=a)
                  (CORE_N
                    (NUC_N (N 8=number))
                    (PP
                      (CORE_P
                        (NUC_P (P 9=of))
                        (NP
                          (CORE_N (NUC_N (N 10=safeguards)))
                          (NUC (V 11=adopted))
                          (PP-PERI
                            (CORE_P
                              (NUC_P (P 12=after))
                              (NP
                                (OP-DEF 13=the)
                                (CORE_N
                                  (NP (CORE_N (NUC_Q (QNT 14=1987))))
                                  (NUC_N (N 15=crash))))))))))))))))
      (. 16=.))))

				[...wait for it...]

(SENTENCE
  (CLAUSE
    (CORE
      (NP (CORE_N (NUC_N (N 2=breather) (N 1=early-morning))) (OP-DEF 0=That))
      (NUC
        (AUX-TNS 3=is)
        (NP
          (CORE_N
            (NUC_Q (QNT 5=one) (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 4=just))))))
          (PP-PERI
            (CORE_P
              (NUC_P (P 6=of))
              (NP
                (CORE_N
                  (NUC_N (N 8=number))
                  (PP-PERI
                    (CORE_P
                      (NUC_P (P 9=of))
                      (NP
                        (CORE_N
                          (NUC_N (N 10=safeguards))
                          (CORE-PERI
                            (PP-PERI
                              (CORE_P
                                (NUC_P (P 12=after))
                                (NP
                                  (CORE_N
                                    (NUC_N (N 15=crash))
                                    (QP (CORE_Q (NUC_Q (QNT 14=1987)))))
                                  (OP-DEF 13=the))))
                            (NUC (V 11=adopted))))))))
                (OP-DEF 7=a))))))
      (. 16=.))))

				[...wait for it...]

(SENTENCE
  (CLAUSE
    (CORE
      (NP (OP-DEF 0=That) (CORE_N (NUC_N (N 1=early-morning) (N 2=breather))))
      (NUC
        (AUX-TNS 3=is)
        (NP
          (CORE_N
            (NUC_Q (QNT 5=one))
            (PP
              (P 6=of)
              (NP
                (OP-DEF 7=a)
                (CORE_N
                  (NUC_N (N 8=number))
                  (PP
                    (P 9=of)
                    (NP
                      (CORE_N
                        (NUC_N
                          (N 10=safeguards)
                          (CORE-PERI
                            (NUC (V 11=adopted))
                            (PP-PERI
                              (CORE_P
                                (NUC_P (P 12=after))
                                (NP
                                  (OP-DEF 13=the)
                                  (CORE_N
                                    (NP-PERI
                                      (CORE_N (NUC_Q (QNT 14=1987))))
                                    (NUC_N (N 15=crash)))))))))))))))))
      (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 4=just))))))
  (. 16=.))

Supertags

	token	arc	supertag
1	That	3	(NP* (OP-DEF <>))
2	early-morning	3	(NUC_N* (N <>))
3	breather	4	(NP (CORE_N (NUC_N (N <>))))
4	is	0	(SENTENCE (CLAUSE (CORE (NP ) (NUC (AUX-TNS <>)) (NUC ))))
5	just	4	(CORE* (ADVP-PERI (CORE_ADV (NUC_ADV (ADV <>)))))
6	one	4	(NUC (NP (CORE_N (NUC_Q (QNT <>)) (PP ))))
7	of	6	(PP (P <>) (NP ))
8	a	9	(NP* (OP-DEF <>))
9	number	7	(NP (CORE_N (NUC_N (N <>)) (PP )))
10	of	9	(PP (P <>) (NP ))
11	safeguards	10	(NP (CORE_N (NUC_N (N <>))))
12	adopted	11	(NUC_N* (CORE-PERI (NUC (V <>))))
13	after	12	(CORE-PERI* (PP-PERI (CORE_P (NUC_P (P <>)) (NP ))))
14	the	16	(NP* (OP-DEF <>))
15	1987	16	(CORE_N* (NP-PERI (CORE_N (NUC_Q (QNT <>)))))
16	crash	13	(NP (CORE_N (NUC_N (N <>))))
17	.	0	(SENTENCE (. <>))