def prefixedNameQname(self, prefixedName):
        if prefixedName:    # passing None would return element qname, not prefixedName None Qname
            return qnameEltPfxName(self, prefixedName)
        else:
            return None
Returns ModelValue.QName of prefixedName using this element and its ancestors' xmlns.
dataset/ETHPy150Open Arelle/Arelle/arelle/ModelObject.py/ModelObject.prefixedNameQname