How to import nodes that reference each other using Feeds? I have a content type that references nodes of the same content type (using References module).

So example nodes might look like this:

Title   Body       See also (Node reference)
AAA     Testing    CCC 
BBB     Testing 
CCC     Testing    AAA, BBB


I'm pulling all of this information from an XML feed using Feeds Node processor. The problem is that when creating node AAA, node CCC hasn't been created yet so the reference field doesn't populate.

Do I need to create a second importer - but can two importers update the same nodes? I also had a look at Feeds Self Node Processor but don't think that's the answer.
Two importers can work on the same nodes without any problem, but that's not what you need.  Instead, You need to set the importer to update/overwrite existing nodes when they have the same GUID.  Then you run the importer twice on the same xml file.  The first time they won't be populated properly, but because they'll already exist the second time, the second run should fix it.