The most typical way of populating lists in forms is through the use of the allowedValues property. From this property, you can specify an optional list of permitted values for <Select> and <MultiSelect> elements. The value of this component is always a list and usually contains strings.
<Field name=’department’>
   <Display class=’Select’ action=’true’>
      <Property name=’title’ value=’Department’/>
      <Property name=’allowedValues’>
         <List>
         <String>Accounting</String>
         <String>Human Resources</String>
         <String>Sales</String>
         <String>Engineering</String>
         </List>
      </Property>
   </Display>
</Field>