1. A method for query formulation, comprising: searching, performed at least in part with a configuration of computing hardware and programmable memory, a corpus, to produce a first collection of records, by testing for appearances of a lexical unit that can be indicative of an object-of-interest; identifying, performed at least in part with a configuration of computing hardware and programmable memory, a first collection of role values corresponding to the first collection of records; performing, performed at least in part with a configuration of computing hardware and programmable memory, frequency analysis of sets of one or more lexical units, contained within the first collection of role values, to produce a first candidate list of exclude terms; and wherein each role value is part of a frame instance, each instance produced by application of a frame extraction rule to a record of the corpus.