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	What	2	(NP-WH (PRO-WH <>))
2	accounts	0	(SENTENCE (CLAUSE (PrCS (NP-WH )) (CORE (NUC (V <>)) (PP (P ) (NP )))))
3	for	2	(P <>)
4	the	5	(NP* (OP-DEF <>))
5	difference	2	(NP (CORE_N (NUC_N (N <>))))
6	?	0	(SENTENCE (. <>))