12. The system of claim 11 , wherein said third parent data collection rule comprises at least one among a rule for obtaining a sum of said second event data retrieved from said two instances of said first child template, a rule for obtaining an average value of said second event data retrieved from said two instances of said first child template, a rule for obtaining a maximum value from said second event data retrieved from said two instances of said first child template, and a rule for obtaining a minimum value from said second event data retrieved from said two instances of said first child template.
11. The system of claim 10 , wherein said processing element is configured to generate a name for each of said second parent data collection rule and said third parent data collection rule, said name said specifying said event data collection rule associated with said second and third parent data collection rules and said respective parent template, and a template which precedes said respective patent template in said data propagation path.