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 (CORE_N (NUC_N (N-PROP 15=Congress))))
      (SENTENCE-PERI
        (PrDP (ADVP (CORE_ADV (NUC_ADV (ADV 0=When)))))
        (CLAUSE
          (CORE
            (CORE (NP (PRO 1=it)) (NUC (V 2=threatened)))
            (CORE
              (PP
                (CORE_P
                  (NUC_P (P 7=as))
                  (NP
                    (CORE_N
                      (NUC_N (N 9=test))
                      (PP-PERI
                        (CORE_P
                          (NUC_P (P 10=for))
                          (NP
                            (CORE_N
                              (NUC_N (N 13=veto))
                              (AP-PERI (CORE_A (NUC_A (A 12=line-item)))))
                            (OP-DEF 11=a)))))
                    (OP-DEF 8=the))))
              (NP (CORE_N (NUC_N (N 6=provision))) (OP-DEF 5=this))
              (CLM 3=to)
              (NUC[NUCid=1] (V 4=use))))))
      (NUC (V 16=caved))
      (. 17=.)
      (, 14=,))))

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Supertags

	token	arc	supertag
1	When	3	(CLAUSE* (CLM <>))
2	it	3	(NP (PRO <>))
3	threatened	0	(SENTENCE (PrDP (CLAUSE (CORE (CORE (NP ) (NUC (V <>)))))))
4	to	5	(CORE* (CLM <>))
5	use	3	(CORE* (CORE (NUC (V <>)) (NP ) (PP )))
6	this	7	(NP* (OP-DEF <>))
7	provision	5	(NP (CORE_N (NUC_N (N <>))))
8	as	5	(PP (CORE_P (NUC_P (P <>)) (NP )))
9	the	10	(NP* (OP-DEF <>))
10	test	8	(NP (CORE_N (NUC_N (N <>)) (PP )))
11	for	10	(PP (CORE_P (NUC_P (P <>)) (NP )))
12	a	14	(NP* (OP-DEF <>))
13	line-item	14	(CORE_N* (AP-PERI (CORE_A (NUC_A (A <>)))))
14	veto	11	(NP (CORE_N (NUC_N (N <>))))
15	,	3	(PrDP* (, <>))
16	Congress	17	(NP (CORE_N (NUC_N (N-PROP <>))))
17	caved	0	(SENTENCE (CLAUSE (CORE (NP ) (NUC (V <>)))))
18	.	0	(SENTENCE (. <>))