sub: pub.synchronization.xref:createXReference

Hello Experts,
Can you please explain what is the use of this service “pub.synchronization.xref:createXReference”. with real world explanation.
actually I gone through the IS documentation…

Often, multiple applications within an enterprise use equivalent data. For example, a
Customer Relationship Management (CRM) system and a Billing system both contain
information about customers. If the address for a customer changes, the change should
be updated in both systems. Data synchronization keeps equivalent data across multiple
systems consistent; that is, if data is changed in one application, a similar change is made
to the equivalent data in all other applications.

For more details read “9-8_Publish_Subscribe_Developers_Guide” chap. #9. Also review the ATC_XREF table present in webMethods product tables.