The information used to generate the DD statements for the target libraries and distribution libraries is obtained from the DDDEF entries in the target zone. Generally, the name of the DDDEF entry matches the name of the DD statement generated. Sometimes, however, SMP/E uses information in a DDDEF entry to generate a DD statement with a name different from the DDDEF entry name. For example, when calling the link-edit utility to link a load module to LINKLIB, SMP/E uses the LINKLIB DDDEF entry to generate the SYSLMOD DD statement.