If a JCL statement contains a symbolic parameter (for example, &LIBRARY),; use the &SYSNSUB built-in function to prevent the CLIST from performing erroneous symbolic substitution. Assume that the preceding CLIST contained the JCL statement:

//dd2   dd  dsn=&library,disp=(,pass),unit=sysda

To prevent any symbolic substitution, you can enclose the symbolic parameter &library in the &SYSNSUB built-in function as follows:

//dd2   dd  dsn=&SYSNSUB(0,&library),disp=(,pass),unit=sysda

The number 0 in parentheses after &SYSNSUB tells the CLIST how many levels of symbolic substitution you want performed on the parameter (in this case, zero levels). For more information about the &SYSNSUB built-in function, see Limiting the level of symbolic substitution - &SYSNSUB.