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SYNTAX:
 
xpxTestAggrByIndex (aggrId      : AGGREGATE OF GENERIC;
                   elementIndex : INTEGER;                   VAR isSet    : BOOLEAN)
                    status       : INTEGER;
 
The xpxTestAggrByIndex function returns TRUE in the isSet argument if the specified element elementIndex (starting from one) in the persistent aggregate aggrId has a value assigned, else FALSE will be returned in the isSet argument.
This function is equivalent to the EDMinterface function sdaiTestAggrByIndex

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