Hook used by components to allow the validator to contribute additional attributes or (more often) client-side JavaScript (via the {@link org.apache.tapestry5.services.FormSupport#addValidation(Field,String,String,Object)}).
@param field the field which is currently being rendered
@param message formatted validation message, either from validation messages, or from an override
@param writer markup writer, allowing additional attributes to be written into the active element
@param formSupport used to add JavaScript
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