routine-name
    Specifies the name of the routine. Routine names must be unique
    within a package. Furthermore, routine names may not conflict with
    any token names used by LSE for any language using the package.

 parameter, . . .
    Specifies the names of the parameters of the routine. These
    parameters must be defined (using the DEFINE PARAMETER command)
    prior to expanding an instance of a call on this routine. However,
    the parameters do not need to be defined prior to the DEFINE
    ROUTINE command. If you omit this qualifier, then the routine
    is presumed to have no parameters.

    The following qualifiers are position-sensitive; they may be used
    only with the list of parameters to the routine.

    /BY_VALUE

    Indicates that the parameter is passed by value.

    /BY_REFERENCE

    Indicates that the parameter is passed by address.

    /BY_DESCRIPTOR

    Indicates that the address of the parameter descriptor is passed.

    /[NO]OPTIONAL

    Specifies whether the parameter is required or optional. The
    default is /NOOPTIONAL.

    The /BY_VALUE, /BY_REFERENCE, and /BY_DESCRIPTOR qualifiers are
    mutually exclusive. These qualifiers are used primarily for
    languages, such as COBOL, that require explicit specification
    of passing mechanisms for routine calls.