OK, so I want to mod in a class that consumes items to cast spells. From what I can tell, some things are clearly labeled as particular item types in the XML by just giving them empty brackets (i.e. mushrooms all have <mushroom/> in them.) Question is, can I create new arbitrary item categories by just adding empty tags in like that? For example, if I want a spell that consumes any given crossbow bolt and casts attack spell for having done so, can I add a <bolt/> tag to all crossbow bolts? For that matter, is it even possible to have a "type=item" spell trigger an attack spell? Thanks!