I don't think this necessarily applies just to machines. I know that when I am handed a resume the first thing I do is skim over it and preform the analog versi

I don't think this necessarily applies just to machines. I know that when I am handed a resume the first thing I do is skim over it and preform the analog version of "searching for key words." If I see the words I am looking for, then I may look at the most recent job description and then maybe the summary... I think this is particularly true for technical positions. You want to know that they've got a clue about what they just applied for. Not that I'll need to look at resumes at my new job (I finally get to write code and not just reports!).