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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				[...wait for it...]

(SENTENCE
  (CLAUSE
    (CORE
      (`` 0=``)
      (NP
        (OP-DEF 1=The)
        (CORE_N (AP-PERI (CORE_A (NUC_A (A 2=disturbing)))) (NUC_N (N 3=thing)))
        (PP
          (CORE_P
            (NUC_P (P 4=about))
            (NP (OP-DEF 5=this) (CORE_N (NUC_N (N 6=abortion) (N 7=issue)))))))
      (AUX-TNS 8=is)
      (. 27=.))
    (CLAUSE
      (CLM 9=that)
      (CORE
        (NP (OP-DEF 10=the) (CORE_N (NUC_N (N 11=debate))))
        (AUX 13=become)
        (NUC (V 14=polarized))
        (, 15=,)
        (CLAUSE
          (CLM 16=so)
          (CLM 17=that)
          (CORE
            (NP (OP-NEG 18=no) (CORE_N (NUC_N (N 19=mechanism))))
            (NUC (V 20=exists))
            ('' 21='')
            (PP
              (CORE_P
                (NUC_P (P 22=for))
                (CORE
                  (NUC (V 23=finding))
                  (NP
                    (OP-DEF 24=a)
                    (CORE_N
                      (AP-PERI (CORE_A (NUC_A (A 25=middle))))
                      (NUC_N (N 26=ground))))))))))
      (OP-TNS 12=has))))

				[...wait for it...]

(SENTENCE
  (`` 0=``)
  (CLAUSE
    (CORE
      (NP
        (OP-DEF 1=The)
        (CORE_N (AP-PERI (CORE_A (NUC_A (A 2=disturbing)))) (NUC_N (N 3=thing)))
        (PP
          (CORE_P
            (NUC_P (P 4=about))
            (NP (OP-DEF 5=this) (CORE_N (NUC_N (N 6=abortion) (N 7=issue)))))))
      (V 8=is))
    (CLAUSE
      (CLM 9=that)
      (CORE
        (NP (OP-DEF 10=the) (CORE_N (NUC_N (N 11=debate))))
        (NUC (AUX 13=become) (V 14=polarized))
        (, 15=,)
        (CLAUSE
          (CLM 16=so)
          (CLM 17=that)
          (CORE
            (NP
              (OP-DEF 18=no)
              (CORE_N
                (NUC_N (N 19=mechanism))
                (PP
                  ('' 21='')
                  (CORE_P
                    (NUC_P (P 22=for))
                    (CORE
                      (NUC (V 23=finding))
                      (NP (OP-DEF 24=a) (CORE_N (NUC_N (A 25=middle) (N 26=ground)))))))))
            (NUC (V 20=exists)))))
      (OP-TNS 12=has)))
  (. 27=.))

Supertags

	token	arc	supertag
1	``	0	(SENTENCE (`` <>))
2	The	4	(NP* (OP-DEF <>))
3	disturbing	4	(CORE_N* (AP-PERI (CORE_A (NUC_A (A <>)))))
4	thing	0	(SENTENCE (CLAUSE (CORE (NP (CORE_N (NUC_N (N <>))) (PP )) (V )) (CLAUSE )))
5	about	4	(PP (CORE_P (NUC_P (P <>)) (NP )))
6	this	8	(NP* (OP-DEF <>))
7	abortion	8	(NUC_N* (N <>))
8	issue	5	(NP (CORE_N (NUC_N (N <>))))
9	is	4	(V <>)
10	that	15	(CLAUSE* (CLM <>))
11	the	12	(NP* (OP-DEF <>))
12	debate	15	(NP (CORE_N (NUC_N (N <>))))
13	has	15	(CORE* (OP-TNS <>))
14	become	15	(NUC* (AUX <>))
15	polarized	4	(CLAUSE (CORE (NP ) (NUC (V <>)) (CLAUSE )))
16	,	15	(CORE* (, <>))
17	so	21	(CLAUSE* (CLM <>))
18	that	21	(CLAUSE* (CLM <>))
19	no	21	(NP (OP-DEF <>))
20	mechanism	21	(NP (CORE_N (NUC_N (N <>))))
21	exists	15	(CLAUSE (CORE (NP ) (NP ) (NUC (V <>)) (NP )))
22	''	23	(PP* ('' <>))
23	for	21	(NP (CORE_N (PP (CORE_P (NUC_P (P <>)) (CORE )))))
24	finding	23	(CORE (NUC (V <>)) (NP ))
25	a	27	(NP* (OP-DEF <>))
26	middle	27	(A <>)
27	ground	24	(NP (CORE_N (NUC_N (A ) (N <>))))
28	.	0	(SENTENCE (. <>))