In BMC Impact Solutions and BMC ProactiveNet, selector syntax that tells a cell the incoming events to which to apply the associated event policies. When you use these criteria to select events rather than create a single event management policy for each event type, event selection criteria perform the event management policy equivalent of dynamic data for rules. You can specify event selection criteria by using the BMC ProactiveNet Administration Console. Event selection criteria are also contained in the Master Rule Language (MRL) files.