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Search Scope Rule Behavior : Include vs Require

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While creating Scope rules I always used to get confused with "Include - Any item that matches this rule will be included, unless the item is excluded by another rule" and "Require - Every item in the scope must match this rule" behavior options.

If you have only one scope rule for a scope both the options behave same but if you have multiple rules for the scope then the behavior change.  "Include - Any item that matches this rule will be included, unless the item is excluded by another rule" works like OR operator where as "Require - Every item in the scope must match this rule" behaves as AND operator. 

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