Problem Space: negatives or only positives

Thank you all who have helped me so far. I am still collecting 
information but getting ready to actually code (C and crm114).

My problem space is a strange one (code will be GPL 2, 2+ or 3, I 
haven't decided and will be based on other F/OSS projects which I don't 
control). I am working on categorizing web pages. So, things may fit 
into multiple categories, they may only fit one. They may not fit any 
(as this is access control/filtering not exhaustive).

Some texts I have seen suggest to me I want hyperspace or OSBF. 
Hyperspace is faster and uses less memory which fits what I am after. 
OSBF can be (some texts suggest they trade places) more accurate than 
Hyperspace. Any suggestions?

Finally, I have seen code from CRM114 Revealed that suggests I want:
        {
                 isolate (:stats:)
                 classify <osb unique microgroom>  (A B C)  (:stats:)
                 output /:*:stats:/
        }

However, this doesn't allow for negatives. I am not sure I need or want 
negatives. However, I am sure it ups the accuracy, but slows it down.

Is it possible to do ((A |  nA) (B | nB) ...) where nX is notWhatever? 
Is it possible to do something like (A B C) | D?

Which would be the recommended way of handling this? I am afraid the 
answer is going to be to use negatives. The question is, based on 
people's experience, which is best.

Thank you,
Trever Adams

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