[OS-webwork] Validating an optional field

[Sakke Wiik]

Is it possible to validate optional fields using the 
ValidationInterceptor? I need to check values only if they are set, just 
like "required" works in Struts validation. For example the 
email-validator doesn't accept an empty field.
I was thinking of something like this:
   <field name="email">
       <field-validator type="email">
           <param name="required">false</param>
           <message>Invalid e-mail</message>
       </field-validator>
   </field>

I understand it's possible to write fieldexpression for all fields, but 
aren't there any other way?

Thanks,
Sakke
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