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'file'<br>
DT_File=HASH(0x3211db4)<br>
...
   'Surname2' => ''<br>
   'Title1' => ''<br>
   'Title2' => ''<br>

#@file_parameters contains object method names
foreach my $param (@file_parameters){<br>
    $current{'file'} -> $param($source_file{$key}->$param);<br>
}