Implementing Data Change Notification

Follow the syntax described in this section to implement DCN with payload and DCN without payload.

• Invoking upsert and delete Operations Using Data Change Notification
  Data change notifications (DCNs) with payload directly update the SAP Mobile Server cache, either with the built-in, direct cache-affecting operations :upsert (update or insert), or with :delete.
• Merging a Composite Object Graph
  The DCN merge command optimizes performance for certain applications, by merging an existing data graph within the SAP Mobile Server cache.