Item & Site Categories

I'm wondering if the following can be done: I'd like to retrieve a list of items that belong to a certain site category. I've defined a couple of categories through the netsuite admin by going to lists --> web site --> categories. Then I've associated a couple of inventory items with those categories (item store tab, then category).

Now when I do an ItemSearchBasic and set body fields to false, I can see the category I created there for the item. What I'd like to do is retrieve all inventory items that belong to a specific site category, is this possible through web services? I was looking at the ItemSearchBasic object and the only thing that references categories, is the setCategory method which wants a multi-select object. But I'm not sure that this will get me what I want, I was looking for a setSiteCategory method, unless this is supposed to be it.