On 4/10/07, Walt Stoneburner <[EMAIL PROTECTED]> wrote:

Furthermore syntax like +(-A +B) and -(-A +B) appear to be legal to Luke,
though I have no clue what this even means in simple English.

Let me try:

+(-A +B) -> must match (-A +B) -> must contain B and must not contain A
-(-A +B) -> must not match (-A +B) -> must not (match B and not contain A)

As chris mentioned, they don't mean much outside the rest of the
query... tack on "X Y " to both, and you get:

SHOULD contain X, SHOULD contain Y, MUST contain B, MUST NOT contain A

SHOULD contain X, SHOULD contain Y (effectively, MUST contain X or Y),
MUST NOT (contain B without containing A)

HTH,
-Mike

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