Language Reference Guide : Statements : Commonly Used Elements in Statements : UnnamedParameterList
 
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UnnamedParameterList
Lists parameters that are passed positionally, for example, for 3GL procedures and methods of external classes.
This element has the following syntax:
expression | byref(variable){, expression | byref(variable)}
expression
Specifies any legal expression that evaluates to the appropriate data type
byref(variable)
Passes the value of variable to the called procedure or method by reference