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When several constraints are used, they are linked by an implicit AND i.e. ALL the constraint conditions have to be TRUE for the action to execute (see [[Actions]]).
 
When several constraints are used, they are linked by an implicit AND i.e. ALL the constraint conditions have to be TRUE for the action to execute (see [[Actions]]).
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If you need a more sophisticated logic, you can link the constraints with logical operators:
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* '''AND''' (by default)
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All constraint conditions below this operator have to be TRUE
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* '''OR'''
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AT LEAST ONE of the constraint conditions below this operator has to be TRUE
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* '''XOR''' (XOR = eXclusive OR)
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ONE AND ONLY ONE of the constraint conditions below this operator has to be TRUE
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* '''NOT'''
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NEGATION of the constraint condition attached i.e. the constraint has NOT to be TRUE for the action to execute.
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All these constraints and operators can be nested to get even more sophisticated conditions.
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