Null values with fd:assert

[Daniel Curran]

I have two dates defined as:

<fd:field id="startdate">
   <fd:label>Start Date</fd:label>
   <fd:datatype base="date">
      <fd:convertor type="formatting">
         <fd:patterns>
            <fd:pattern>MM/dd/yyyy</fd:pattern>
         </fd:patterns>
      </fd:convertor>
   </fd:datatype>
</fd:field>
<fd:field id="enddate">
   <fd:label>End Date</fd:label>
   <fd:datatype base="date">
      <fd:convertor type="formatting">
         <fd:patterns>
            <fd:pattern>MM/dd/yyyy</fd:pattern>
         </fd:patterns>
      </fd:convertor>
   </fd:datatype>
   <fd:validation>
      <fd:assert test="enddate &gt; startdate">
         <fd:failmessage>End date must be greater than the Start 
date</fd:failmessage>
      </fd:assert>
   </fd:validation>
</fd:field>

When I set an end date, but leave the start date null I get an error 
_Error evaluating expression on assert validation rule._

I would like the test to pass if either or both fields values are null.

Does anyone know how this would be accomplished? I am also interested in 
documentation of the types of rules that can be used, where should I 
look for this?

Thanks,
Dan Curran


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