Your assert can be 

test="string-length(input) = 0  or (more rules)"




----- Original Message ----- 
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, July 24, 2002 2:33 AM
Subject: Schematron Validation 2


> Another question:
> 
>    I also have non mandatory fields - but if
>    the user gives an input I want to validate the input.
>    So, is there a way in Schematron to say
>    if(input is not empty)
>       assert........
> 
>    Can I do something like nested asserts?
> 
>     Thanx again for any help,
> 
> 
>      miHam
> 
> 
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