QSAM or HFS files can be defined using a DD statement, an environment variable, or the TITLE option of the OPEN statement.
When an environment variable or TITLE option is used, the name must be in uppercase. Specify the MVS data set in one of the following ways:
data set-name must be fully qualified and cannot be a temporary data set, for example, it must not start with &.
Specify the HFS file as follows:
The following attribute can be specified in any order after the DSN keyword: