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
        (AUX-TNS 1=is)
        (AP
          (CORE_A
            (NUC_A (A 2=free))
            (CLAUSE
              (CLAUSE
                (CORE
                  (PP
                    (CORE_P
                      (NUC_P (P 5=in))
                      (NP (CORE_N (NUC_N (N 6=chickens))))))
                  (CLM 3=to)
                  (NUC (V 4=invest))))
              (CLAUSE
                (CORE
                  (PP-PERI
                    (CORE_P
                      (NUC_P (P 11=for))
                      (NP
                        (CORE_N
                          (NUC_N (N 12=lack))
                          (PP-PERI
                            (CORE_P
                              (NUC_P (P 13=of))
                              (NP (CORE_N (NUC_N (N 15=wire) (N 14=chicken))))))))))
                  (CLM 9=to)
                  (NUC (V 10=fail)))
                (CLM 8=and))
              (, 7=,)))))
      (. 16=.))))

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Supertags

	token	arc	supertag
1	He	3	(NP (PRO <>))
2	is	3	(NUC* (AUX-TNS <>))
3	free	0	(SENTENCE (CLAUSE (CLAUSE (CORE (NP ) (NUC (AP (CORE_A (NUC_A (A <>)))))) (CORE )) (CLAUSE )))
4	to	5	(CORE* (CLM <>))
5	invest	3	(CORE (NUC (V <>)) (PP (P ) (NP )))
6	in	5	(P <>)
7	chickens	5	(NP (CORE_N (NUC_N (N <>))))
8	,	3	(CLAUSE* (, <>))
9	and	11	(CLAUSE* (CLM <>))
10	to	11	(CORE* (CLM <>))
11	fail	3	(CLAUSE (CORE (NUC (V <>))))
12	for	11	(CORE* (PP-PERI (CORE_P (NUC_P (P <>)) (NP ))))
13	lack	12	(NP (CORE_N (NUC_N (N <>)) (PP )))
14	of	13	(PP (P <>) (NP ))
15	chicken	16	(NUC_N* (N <>))
16	wire	14	(NP (CORE_N (NUC_N (N <>))))
17	.	0	(SENTENCE (. <>))