Identifies the column name in the SQL table (underlying the form list view).
xsf:xdTitleThe columnName attribute is a required attribute of the field element.
The following is an example of the columnName attribute as it is used in the field element:
<xsf:listProperties>
   <xsf:fields>
      <xsf:field
         type="xsd:date"
         name="TravelDate"
         columnName="TravelDate" 
         required="yes"
         viewable="yes"
         node="TravelReport/Header/travelDate"
         aggregation="first"/>
   </xsf:fields>
</xsf:listProperties>