The format of a key in an Allocation member is:
KEY=keyname  | 
where keyname is the name of the key that points to a DD statement entry by the same name in a DSN member (member IOADSN or IOADSNL). keyname usually matches the DD statement to which it points. Mandatory.
Conditional blocks of execution can be specified using the )SEL and )ENDSEL parameters: If no )SEL parameters are specified, the subsequent allocations (that is, KEY=parameters) apply to all products.
)SEL ppp=value
          KEY=keyname
KEY=keyname
    KEY=keyname
        .
    .
    .
)ENDSEL
*
Table 14 Fields for Conditional Blocks of Execution
Field  | 
Description  | 
|---|---|
)SEL  | 
Indication that the subsequent keys are only used for allocation if the subsequent expression, ppp=value, is true. )SEL must begin in column 1. Optional.  | 
ppp  | 
An installation parameter.  | 
)ENDSEL  | 
Indication of completion of this block of key parameters. Mandatory, if )SEL is specified.  | 
*  | 
In column 1, represents a comment line. Optional.  | 
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