Validator Questions - (about example in chapter 11)

[Ryan Cuprak <50...@corpmail.kodak.com>]

Hello,
  I've been reading through chapter 11 in Chuck's book dealing with the 
validator and I have a couple of questions about example 11-1 (things I 
don't get) that maybe someone knows off the top of their head. 
Hopefully my questions aren't too obvious!

 First, what exactly are the arg0 elements used for? From the 
description I gather that they are used to pass in values for the error 
message (  '{0} is not found' etc.) - right? If that is the case, does 
arg0 correspond to "required" and arg1 to "mask" - this is TOTALLY a 
guess.
 For the arg1, how does the ${var:minlength} thing work?
 Second, according to the book, the var element is used to pass 
information to a validation method- where does ${zip} come from? Why 
are ${} used?

Other question, does "postalCode" correspond to a field on the actual 
html form?

<formset>
        <form name="checkoutForm">
                <field property="postalCode" depends="required,mask">
                        <arg0 
key="registrationForm.firstname.displayname"/>
                        <arg1 name="minlength" key="${var:minlength}" 
resource="false"/>
                        <var>
                                <var-name>mask</var-name>
                                <var-value>${zip}</var-value>
                        </var>
                </field
        </form>
</formset>

-Thanks,
  Ryan

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