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 0=Eaton) (N-PROP 1=Corp.))))
      (NUC (V 2=said))
      (. 20=.))
    (CLAUSE
      (CORE
        (NP (PRO 3=it))
        (NUC (V 4=sold))
        (NP
          (OP-DEF 5=its)
          (CORE_N
            (NUC_N
              (N-PROP 6=Pacific)
              (N-PROP 7=Sierra)
              (N-PROP 8=Research)
              (N-PROP 9=Corp.)
              (N 10=unit))))
        (PP-PERI
          (CORE_P
            (NUC_P (P 11=to))
            (NP
              (OP-DEF 12=a)
              (CORE_N
                (NUC_N (N 13=company))
                (NUC (V 14=formed))
                (PP
                  (CORE_P
                    (NUC_P (P 15=by))
                    (NP
                      (CORE_N
                        (NUC_N (N 16=employees))
                        (PP
                          (CORE_P
                            (NUC_P (P 17=of))
                            (NP (OP-DEF 18=that) (CORE_N (NUC_N (N 19=unit))))))))))))))))))

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(SENTENCE
  (CLAUSE
    (CLAUSE
      (CORE
        (PP-PERI
          (CORE_P
            (NUC_P (P 11=to))
            (NP
              (CORE_N
                (NUC_N (N 13=company))
                (CORE-PERI
                  (PP-PERI
                    (CORE_P
                      (NUC_P (P 15=by))
                      (NP
                        (CORE_N
                          (NUC_N (N 16=employees))
                          (PP-PERI
                            (CORE_P
                              (NUC_P (P 17=of))
                              (NP
                                (CORE_N (NUC_N (N 19=unit)))
                                (OP-DEF 18=that))))))))
                  (NUC (V 14=formed))))
              (OP-DEF 12=a))))
        (NP
          (CORE_N
            (NUC_N
              (N 10=unit)
              (N-PROP 9=Corp.)
              (N-PROP 8=Research)
              (N-PROP 7=Sierra)
              (N-PROP 6=Pacific)))
          (OP-DEF 5=its))
        (NP (PRO 3=it))
        (NUC (V 4=sold))))
    (CORE (NP (CORE_N (NUC_N (N-PROP 1=Corp.) (N-PROP 0=Eaton)))) (NUC (V 2=said)))
    (. 20=.)))

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Supertags

	token	arc	supertag
1	Eaton	2	(NUC_N* (N-PROP <>))
2	Corp.	3	(NP (CORE_N (NUC_N (N-PROP <>))))
3	said	0	(SENTENCE (CLAUSE (CORE (NP ) (NUC (V <>))) (CLAUSE )))
4	it	5	(NP (PRO <>))
5	sold	3	(CLAUSE (CORE (NP ) (NUC (V <>)) (NP ) (PP (P ) (NP ))))
6	its	11	(NP* (OP-DEF <>))
7	Pacific	11	(NUC_N* (N-PROP <>))
8	Sierra	11	(NUC_N* (N-PROP <>))
9	Research	11	(NUC_N* (N-PROP <>))
10	Corp.	11	(NUC_N* (N-PROP <>))
11	unit	5	(NP (CORE_N (NUC_N (N <>))))
12	to	5	(P <>)
13	a	14	(NP* (OP-DEF <>))
14	company	5	(NP (CORE_N (NUC_N (N <>))))
15	formed	14	(NUC_N* (CORE-PERI (NUC (V <>)) (PP (P ) (NP ))))
16	by	15	(P <>)
17	employees	15	(NP (CORE_N (NUC_N (N <>)) (PP )))
18	of	17	(PP (P <>) (NP ))
19	that	20	(NP* (OP-DEF <>))
20	unit	18	(NP (CORE_N (NUC_N (N <>))))
21	.	0	(SENTENCE (. <>))