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FUNCTION xpfExecuteFunctionBN (expressSchemaName            : STRING;
                               querySchemaName              : STRING;
 -- optional. Default is that all query schemas for "expressSchemaName" will be searched                                functionName                 : STRING;  -- query, function or procedure
                               argument1, ..., argument     : GENERIC) -- arguments to actual called
query, function or procedure                                functionValue                : GENERIC; -- always INDETERMINATE for procedures