James,

As described in the draft-gould-eppext-verificationcode-03, CNNIC use this 
model provides verification service as VSP.
In the implementation, I found the schema defined the EPP info command with 
date attribute extension. So  I think about it may useful to add an optional 
attribute of “crDate” to the verificationCodeType, and it represent the date of 
Verification Code generated, it could be define like below:
<complexType name="verificationCodeType">
  <simpleContent>
    <extension base="verificationCode:verificationCodeValueType">
      <attribute name="type" type="token" use="required"/>
      <attribute name="crDate" type="dateTime" use="optional"/>
    </extension>
  </simpleContent> 
</complexType>

Although this attribute is not used currently, but may be used in future, 
because a Verification Code may have a expiration for the policy modification 
or improvement. In other words, for example: a label “abc”‘s Verification Code  
which is requested by registrar a years ago may not valid now, because ”abc“ 
may be not a valid word now for some reason. 
    That is a assumption, but in practice, that is really occurred. I suggest 
add this attribute, for product and technical point, this attribute may be used 
by some registry, registry can estimate whether a Verification Code is valid  
for create a new domain, for example,  180 days after generated, registrar need 
request a new Verification Code to conform latest policy.
    
Thank you for kindly attention and Looking forward to your reply, 
--
GuiQing Zhou
CNNIC
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