[E2010][EWS-XML][JAVA]How to list all resource mailboxes (meeting room) in Exchange web service 2010 use EWS API

I want to list all emails held in each meeting room in EWS 2010. I need the SOAP XML request.

I can check user availability (from http://msdn.microsoft.com/en-us/library/aa494212.aspx) so I need the list meeting rooms to check available meeting room. How can I get it? Thanks in advance!