(Filer) API Question: What is the timeout option supposed to do?

From what I can tell, the <timeout> option in the DFM 6.3  does not do anything. The API description makes it sound like it would support long-polling, but the following request immediately returns 0 results on my system, completely ignoring the timeout:


<?xml version="1.0" encoding="UTF-8"?>
<netapp  xmlns="" version="1.0">

Am I using it wrong, or is it supposed to do something else?