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	He	2	(NP (PRO <>))
2	was	0	(SENTENCE (CLAUSE (CORE (NP ) (NUC (AUX-TNS <>)) (NUC ))))
3	previously	2	(CORE* (ADVP-PERI (CORE_ADV (NUC_ADV (ADV <>)))))
4	president	2	(NUC (NP (CORE_N (NUC_N (N <>)) (PP ))))
5	of	4	(PP (P <>) (NP ))
6	the	7	(NP* (OP-DEF <>))
7	company	12	(NP* (NPIP (NP (CORE_N (NUC_N (N <>))))))
8	's	7	(NP* (POS <>))
9	Eastern	12	(NUC_N* (N-PROP <>))
10	Edison	12	(NUC_N* (N-PROP <>))
11	Co.	12	(NUC_N* (N-PROP <>))
12	unit	5	(NP (CORE_N (NUC_N (N <>))))
13	.	0	(SENTENCE (. <>))