This section discusses the use of the IMS
DATA step interface in some of the more advanced areas of
DL/I programming, specifically, restarting update programs and constructing and using
SSAs in DATA step programs. Because this information is intended for experienced
DL/I programmers, there is little explanation of DL/I concepts and facilities in
this section. The purpose of this information is to explain how SAS programs can
be used to perform advanced DL/I functions, not to explain these functions.