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 4=%))
          (PP-PERI
            (CORE_P
              (NUC_P (P 5=of))
              (NP
                (CORE_N
                  (NUC_N (N-PROP 7=Inc.) (N-PROP 6=Valhi))
                  (CLAUSE-PERI
                    (PrCS (NP-WH (PRO-WH 9=which)))
                    (CORE
                      (NP
                        (CORE_N
                          (NUC_N (N 13=two-thirds))
                          (PP-PERI
                            (CORE_P
                              (NUC_P (P 14=of))
                              (NP (CORE_N (NUC_N (N-PROP 15=NL))))))))
                      (PP-PERI
                        (CORE_P
                          (NUC_P (P 10=in))
                          (NP (CORE_N (NUC_N (N 11=turn))))))
                      (NUC (V 12=owns)))))))
            (, 8=,))
          (QP (CORE_Q (NUC_Q (QNT 3=88))))))
      (NP (CORE_N (NUC_N (N-PROP 1=Simmons) (N-PROP 0=Mr.))))
      (NUC (V 2=owns))
      (. 16=.))))

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Supertags

	token	arc	supertag
1	Mr.	2	(NUC_N* (N-PROP <>))
2	Simmons	3	(NP (CORE_N (NUC_N (N-PROP <>))))
3	owns	0	(SENTENCE (CLAUSE (CORE (NP ) (NUC (V <>)) (NP ))))
4	88	5	(CORE_N* (QP (CORE_Q (NUC_Q (QNT <>)))))
5	%	3	(NP (CORE_N (NUC_N (N <>)) (PP )))
6	of	5	(PP (P <>) (NP ))
7	Valhi	8	(NUC_N* (N-PROP <>))
8	Inc.	6	(NP (CORE_N (NUC_N (N-PROP <>))))
9	,	8	(NP* (, <>))
10	which	13	(NP-REL (PRO-REL <>))
11	in	12	(P <>)
12	turn	13	(CORE* (ADVP-PERI (CORE_ADV (NUC_ADV (P ) (N <>)))))
13	owns	8	(NP* (SENTENCE-PERI (CLAUSE (PrCS (NP-REL )) (CORE (NUC (V <>)) (NP )))))
14	two-thirds	13	(NP (CORE_N (NUC_Q (QNT <>)) (PP )))
15	of	14	(PP (P <>) (NP ))
16	NL	15	(NP (CORE_N (NUC_N (N-PROP <>))))
17	.	3	(CORE* (. <>))