I've now created a container class which hosts a DomModel and a QStringListModel, showing two views of the same data. It should be fairly easy to hook up the filter which I had hooked up before, to allow filtering of the list view. After that, we begin to figure out how to hook together the selections. I think the string list model is actually going to have to store a reference to the corresponding DomModel items, and the DomModel items might have to store a reference to the original nodes in the DomDocument...