Validating Indexed Properties

Hello All,

I have a requirement to validate indexed properties in my form. According to 
my requirement the user is initially provided with 3 sets of input fields. 
The user can increase the number of fields in the form using a link provided 
to him. Whenever the link is clicked 3 more sets of input fields are added. 
When the user submits the form these input field should be validated. The 
user may / may not fill a set of input field, in that case this set will not 
be validated. I want to know what is the proper method to validate the 
indexed property of my form.

Thanks in advance.
Sanjana

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