[Inkscape-devel] data argument in XML node listeners

Is the void* data argument in XML node listeners available to pass extra data to listener callback routines, or does it have another function that would prevent that purpose? (For example, passing a pointer to an instance of a class that is unique on a per-document basis.)

I've been reading the listener and DOM tree implementation and it seems that this is correct, but I just wanted to make sure.

-- David