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SYNTAX:
 
xpxIsMember(aggregateId  : AGGREGATE OF GENERIC;             aValue       : GENERIC;
            VAR isMember : BOOLEAN)            status       : INTEGER;
 
The xpxIsMember function tests if at least one element in the specified persistent aggregate aggregateId has a value equal to the value specified in the aValue argument. The argument isMember is set to TRUE if the specified value exist in the aggregate, else isMember is set to FALSE.
This function is equivalent to the EDMinterface function sdaiIsMember

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