Pubsub API has node attribute missing in #event <item> element
Added the optional node attribute to the basic and payload items.
Unfortunately, the donated patch is not sufficient
it doesn't make the changes in the preferred manner (extending NodeExtension instead of adding a node attribute)
it doesn't update the test cases (they no longer compile)
it doesn't fix all the use cases (provider only adds node attribute if there is a payload)
adds the node attribute to elements where it does not belong (retract item)
This patch cannot be applied as is. The issue itself is still valid though.