Setting a validation to a form is possible with an XSLT code. here is an example : 

Bellow a user's form : 

1666099299150-670.png

I want to make validation on my firstName to not exceed 20 chars, i can do it by XSLT like this : 

1666099830526-443.png

First step, I create a variable to get the form value, then I test on this value, here the result : 

1666099913266-344.png

It works very well =) 

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