DEFAULT to specify a replacement parameter def1 def2 ... . For
an optional parameter, you need not specify an actual parameter in the
method call. While a formal parameter with the addition OPTIONAL
is initialized according to its type, a formal parameter with addition
DEFAULT copies the value and type of the replacement parameter
def1 def2 ... . As a replacement parameter def1 def2 ... ,
you can specify any appropriate data object that is visible at this
position except for components of
Boxed Component s .
If no actual parameter is specified for a generically typed formal
parameter with the OPTIONAL addition at the time of the call, the
type of the formal parameter is completed according to
fixed rules .
Latest notes: If a formal parameter is typed as a reference variable and
cannot be changed in the procedure , then
the typing is executed as for an Up Cast . If
it can be changed in the procedure, then the actual parameter must be
compatible to the formal parameter.
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