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The directory component of a PDS contains eight‑character member names that are physically kept in alphabetical order. Each directory entry points to where its associated member is located in the data component. However, the directory of a PDS can contain more than member names and pointers. Optionally, additional data can be placed in the directory. For example, ISPF/PDF stores ISPF/PDF statistics, and the linkage editor stores information about load modules.
The linkage editor can also change what the member names represent in a directory. A member name usually points to a unique PDS member. However, for load modules, multiple member names can point to the same physical member. This technique lets you specify a synonym, or an alias, for a member. You can create an unlimited number of alias entries for each member. SMP/E tracks these alias relationships, and when changes are installed, updates the original member. You can use CA Auditor to verify whether the library alias relationships match those recorded in the SMP/E CSI. The Library Analysis Display (2.3.5) flags all the directory entries that do not match the information contained in the CSI.
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