57. The method of claim 55 , wherein each of a plurality of operator evaluations includes a boolean indication of certainty or uncertainty for each respective attribute instance deemed likely possible.
57. The method of claim 55 , wherein each of a plurality of operator evaluations includes a boolean indication of certainty or uncertainty for each respective attribute instance deemed likely possible. 59. The method of claim 57 , wherein subsequent materialisation of an operator evaluation can resolve any uncertainty by inspecting a respective collective data cell for a respective instance of an attribute deemed uncertain.