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	The	2	(NP* (OP-DEF <>))
2	accident	4	(NP (CORE_N (NUC_N (N <>))))
3	was	4	(CORE* (OP-TNS <>))
4	caused	0	(SENTENCE (CLAUSE (CORE (NP ) (NUC (V <>)) (PP (P ) (NP )))))
5	by	4	(P <>)
6	faulty	7	(CORE_N* (AP-PERI (CORE_A (NUC_A (A <>)))))
7	operation	4	(NP (CORE_N (NUC_N (N <>)) (PP )))
8	of	7	(PP (P <>) (NP ))
9	a	10	(NP* (OP-DEF <>))
10	valve	8	(NP (CORE_N (NUC_N (N <>))))
11	.	4	(CORE* (. <>))