How to add your own validation + make use of existing validator

[Manisha Sathe]

I am using validator framework. But for some business logic - i need to some 
other validation depending on some conditions. 
 
I want to keep validation of validator framework as it is + after that i want 
to add my own.
 
First of all is it possible If yes, then how ?
 
regards
Manisha

                
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