METS is not included in the list because nobody has requested it.  If someon  requests it (you, for example) it will be added.  
However if nobody requests it then I don't see any point in gratuitiously adding it. I'm not aware of any projects using METS as an SRU record format. 
----- Original Message -----
From: [log in to unmask] href="mailto:[log in to unmask]">Mark Diggory
To: [log in to unmask] href="mailto:[log in to unmask]">[log in to unmask]
Sent: Friday, March 09, 2007 9:50 PM
Subject: METS as record format


Has anyone out there explored using METS as the return record format 
for SRU/W? I was a little surprised not to see it listed in the 
website ...


Mark R. Diggory - DSpace Systems Manager
MIT Libraries, Systems and Technology Services
Massachusetts Institute of Technology
Office: E25-131
Phone: (617) 253-1096