A further notable debate about the metaphysics of haecceities concerns their modal status. Some, like Plantinga (1974), take haecceities to exist necessarily. So, while being Napoleon goes uninstantiated in possible worlds without Napoleon, it nevertheless exists in such worlds. According to other views like that of Adams (1981), haecceities are contingent existents, existing only in those worlds where their bearers exist. So, although being Napoleon actually exists, it neither exists nor is instantiated at worlds without Napoleon. For discussion of this debate and cognate ones, see Diekemper (2015).