Campaign Management Tool Advanced Topics

While looking into the schema, I saw in some places we are referring to an element of a different schema instead of declaring it again and again. But in some places, it is done using template attribute and other places use aggregate attribute. So to test, I though of using the element "auditTrail" declared inside the library xtk:common The element is as as below   <element name="auditTrail">     <element defOnDuplicate="true" name="createdBy" template="xtk:common:createdBy"/>     <element defOnDuplicate="true" name="modifiedBy" template="xtk:common:modifiedBy"/>     <attribute defOnDuplicate="true" default="GetDate()" desc="Creation date" label="Creation date"                name="created" type="datetime"/>     <attribute defOnDuplicate="true" default="GetDate()" desc="Modification date&