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Notice the template syntax. The function syntax is known in JavaScript as a self-invoking function or an Immediately Invoked Function Expression (IIFE). The function is immediately invoked after it is defined. ServiceNow manages the function and when it is invoked; developers do not explicitly call Business Rule scripts.
Reference Link: https://developer.servicenow.com/dev.do#!/learn/learning-plans/utah/new_to_servicenow/app_store_learnv2_scripting_utah_business_rule_scripts
Notice the template syntax. The function syntax is known in JavaScript as a self-invoking function or an Immediately Invoked Function Expression (IIFE).
"The template's process function, known as a self-invoking or immediately invoked function expression, is automatically invoked when a resource is accessed."
https://developer.servicenow.com/dev.do#!/learn/learning-plans/rome/servicenow_application_developer/app_store_learnv2_rest_rome_resource_script
D, that´s an IIFE which stands for inmediately invoked Function Expression
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