def addUniqueId(self):
        self.attributes["id"] = "H_%d" % Element._idCounter
        Element._idCounter = Element._idCounter + 1
Add a unique (across a given Python session) id attribute to this
dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/words/xish/domish.py/Element.addUniqueId