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	It	3	(NP (PRO <>))
2	has	3	(CORE* (OP-TNS <>))
3	happened	0	(SENTENCE (CLAUSE (CORE (NP ) (NUC (V <>)))))
4	before	3	(CORE* (ADVP-PERI (CORE_ADV (NUC_ADV (ADV <>)))))
5	.	3	(CORE* (. <>))