Lazy Load. How to stop after closing tag is reached

[SDJeff]

If you have a bigger file and getting elements

$catalog_structure = $reader->value('T_NEW_CATALOG.CATALOG_GROUP_SYSTEM.CATALOG_STRUCTURE')->lazy();

 $i = 0;
 foreach ($catalog_structure as $item) { 

   // iterate items <CATALOG_STRUCTURE></CATALOG_STRUCTURE>

}

How to stop reading file after all elements are iterated. It loops to the end of the file even there cannot come any more item for this child elements.