To access nonrelational sources, such as an IMS database or VSAM file, use the PowerExchange Navigator to create a data map that defines various physical and logical records. PowerExchange accepts a SQL statement in the normal way from the client and passes it to the PowerExchange Listener. The PowerExchange Listener accesses the database and gets the rows. PowerExchange accepts only a subset of the extensive SQL syntax. You must use only the SQL that PowerExchange supports for the SQL requests to be accepted.