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=He)) (NUC (V 1=said)) (. 17=.))
    (CLAUSE
      (CORE
        (NP (CORE_N (NUC_N (N-PROP 2=Westmoreland))))
        (NUC (AUX-TNS 3=is) (V 4=looking))
        (PP
          (CORE_P
            (NUC_P (P 5=at))
            (NP
              (CORE_N
                (NUC_N (N 6=investment) (N 7=stakes))
                (PP
                  (CORE_P
                    (NUC_P (P 8=in))
                    (NP
                      (CORE_N
                        (AP-PERI (CORE_A (NUC_A (A 9=other))))
                        (NUC_N (N 10=cogeneration) (N 11=plants)))
                      (AP-PERI
                        (CORE_A (NUC_A (A 12=east)))
                        (PP
                          (CORE_P
                            (NUC_P (P 13=of))
                            (NP
                              (OP-DEF 14=the)
                              (CORE_N
                                (NUC_N (N-PROP 15=Mississippi) (N-PROP 16=River))))))))))))))))))

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(SENTENCE
  (CLAUSE
    (CLAUSE
      (OP-TNS 3=is)
      (CORE
        (PP
          (CORE_P
            (NUC_P (P 5=at))
            (NP
              (CORE_N
                (NUC_N (N 7=stakes) (N 6=investment))
                (PP-PERI
                  (CORE_P
                    (NUC_P (P 8=in))
                    (NP
                      (CORE_N
                        (NUC_N (N 11=plants) (N 10=cogeneration))
                        (CORE-PERI
                          (PP-PERI
                            (CORE_P
                              (NUC_P (P 13=of))
                              (NP
                                (CORE_N
                                  (NUC_N (N-PROP 16=River) (N-PROP 15=Mississippi)))
                                (OP-DEF 14=the))))
                          (NUC (AP (CORE_A (NUC_A (A 12=east))))))
                        (AP-PERI (CORE_A (NUC_A (A 9=other))))))))))))
        (NP (CORE_N (NUC_N (N-PROP 2=Westmoreland))))
        (NUC (V 4=looking))))
    (CORE (NP (PRO 0=He)) (NUC (V 1=said)))
    (. 17=.)))

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Supertags

	token	arc	supertag
1	He	2	(NP (PRO <>))
2	said	0	(SENTENCE (CLAUSE (CORE (NP ) (NUC (V <>))) (CLAUSE )))
3	Westmoreland	5	(NP (CORE_N (NUC_N (N-PROP <>))))
4	is	5	(CORE* (OP-TNS <>))
5	looking	2	(CLAUSE (CORE (NP ) (NUC (V <>)) (PP (P ) (NP ))))
6	at	5	(P <>)
7	investment	8	(NUC_N* (N <>))
8	stakes	5	(NP (CORE_N (NUC_N (N <>))))
9	in	8	(CORE_N* (PP-PERI (CORE_P (NUC_P (P <>)) (NP ))))
10	other	12	(CORE_N* (AP-PERI (CORE_A (NUC_A (A <>)))))
11	cogeneration	12	(NUC_N* (N <>))
12	plants	9	(NP (CORE_N (NUC_N (N <>))))
13	east	12	(CORE_N* (AP-PERI (CORE_A (NUC_A (A <>)) (PP (P ) (NP )))))
14	of	13	(P <>)
15	the	17	(NP* (OP-DEF <>))
16	Mississippi	17	(NUC_N* (N-PROP <>))
17	River	13	(NP (CORE_N (NUC_N (N-PROP <>))))
18	.	2	(CLAUSE* (. <>))