Added sys:incomplete aspect.

Extended <mandatory> definition in the DD.
The "mandatory" properties in our system have, until now, been optional, i.e. the integrity has not been enforced.
It is possible to have
   <mandatory enforced="true">true</mandatory>, which means "mandatory and enforced", but
   <mandatory enforced="false">true</mandatory>, which means "mandatory but not enforced".
Our system properties have been marked as "mandatory".
Dublin core has had the properties marked as "required".  Currently, if the Dublin Core is added, the node is tagged with sys:incomplete.


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@2562 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/transaction/TransactionListener.java

@@ -29,6 +29,8 @@ public interface TransactionListener
      * Allows the listener to flush any consuming resources.  This mechanism is
      * used primarily during long-lived transactions to ensure that system resources
      * are not used up.
+     * <p>
+     * This method must not be used for implementing business logic.
      */
     void flush();