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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Supertags

	token	arc	supertag
1	That	4	(NP (PRO-DEM <>))
2	's	4	(NUC* (AUX-TNS <>))
3	the	4	(NP* (OP-DEF <>))
4	problem	0	(SENTENCE (CLAUSE (CORE (CORE (NP ) (NUC (NP (CORE_N (NUC_N (N <>)))))))))
5	,	4	(CORE* (, <>))
6	is	0	(SENTENCE (PoDP (CLAUSE (CORE (NUC (AUX-TNS <>)) (NP )))))
7	n't	6	(CORE* (OP-NEG <>))
8	it	6	(NP (PRO <>))
9	?	0	(SENTENCE (. <>))
10	''	0	(SENTENCE ('' <>))