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
    (CLAUSE
      (CLAUSE
        (CORE
          (CORE
            (PP-PERI
              (CORE_P
                (NUC_P (P 8=about))
                (NP
                  (CORE_N
                    (NUC_N (N 10=discrimination))
                    (AP-PERI (CORE_A (NUC_A (A 9=racial))))))))
            (NP
              (CORE_N
                (NUC_N (N 5=voters))
                (AP-PERI (CORE_A (NUC_A (A 4=black))))
                (AP-PERI (CORE_A (NUC_A (A 3=many))))))
            (CLM 2=that)
            (NUC (V 6=feel)))
          (CORE (NUC (AP (CORE_A (NUC_A (A 7=bitter)))))))
        (OP-TNS 12=so))
      (CLAUSE
        (CORE
          (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 20=uncritically))))
          (NP
            (CORE_N (NUC_N (N 19=candidates)) (AP-PERI (CORE_A (NUC_A (A 18=black))))))
          (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 15=too))))
          (NP (PRO 13=they))
          (NUC (V 17=support))
          (, 16=,)
          (, 14=,)))
      (, 11=,))
    (CORE (NP (PRO 0=He)) (NUC (V 1=said)))
    (. 21=.)))

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Supertags

	token	arc	supertag
1	He	2	(NP (PRO <>))
2	said	0	(SENTENCE (CLAUSE (CORE (NP ) (NUC (V <>))) (CLAUSE )))
3	that	7	(CLAUSE* (CLM <>))
4	many	6	(CORE_N* (QP-PERI (CORE_Q (NUC_Q (QNT <>)))))
5	black	6	(CORE_N* (AP-PERI (CORE_A (NUC_A (A <>)))))
6	voters	7	(NP (CORE_N (NUC_N (N <>))))
7	feel	2	(CLAUSE (CORE (NP ) (NUC (V <>)) (PP )))
8	bitter	7	(CORE* (AP (CORE_A (NUC_A (A <>)))))
9	about	7	(PP (CORE_P (NUC_P (P <>)) (NP )))
10	racial	11	(CORE_N* (AP-PERI (CORE_A (NUC_A (A <>)))))
11	discrimination	9	(NP (CORE_N (NUC_N (N <>))))
12	,	18	(CLAUSE-PERI* (, <>))
13	so	18	(CLAUSE-PERI* (CLM <>))
14	they	18	(NP (PRO <>))
15	,	16	(ADVP-PERI* (, <>))
16	too	14	(NP* (ADVP-PERI (CORE_ADV (NUC_ADV (ADV <>)))))
17	,	16	(ADVP-PERI* (, <>))
18	support	7	(CLAUSE* (CLAUSE-PERI (CORE (NP ) (NUC (V <>)) (NP ))))
19	black	20	(CORE_N* (AP-PERI (CORE_A (NUC_A (A <>)))))
20	candidates	18	(NP (CORE_N (NUC_N (N <>))))
21	uncritically	18	(CORE* (ADVP-PERI (CORE_ADV (NUC_ADV (ADV <>)))))
22	.	0	(SENTENCE (. <>))