Adobe Exam AD0-E716 Topic 12 Question 49 Discussion

To add an action to a pre-existing route without interfering with the functionality of the original route, the developer must use the before or after parameters in the route declaration. This will load the developer's module in before or after the original module, respectively.

For example, the following code would add an action to the my_module/index route before the action from the original module:

<route id='my_module/index'>

<before>my_module_before</before>

</route>

The my_module_before action would be executed before the MyModuleControllerIndex action, which would allow the developer to perform any necessary setup before the original action is executed.