Partitioned data set
<file format> (PDS) A data set on an IBM mainframe that contains members, each of which acts like a separate data set. Partitioned data sets are more space-efficient than individual data sets, because they can put more than one data set on a track.
They are also used to hold libraries, with one function per member.
The syntax for a member is NAME.OF.PDS(MEMBER) although some systems (such as Phoenix) could use NAME.OF.PDS:MEMBER
Original PDSes were of fixed size, and needed frequent compression to recover space after deleting or changing members.
Newer PDS/E Extended PDSes do not have this problem.
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partially ordered set
Partial Response Maximum Likelihood
partitioned data set