sys.servers in AdventureWorks

I assume that this system view is in master db.

(SELECT * FROM master.sys.servers
EXCEPT
SELECT * FROM AdventureWorks.sys.servers)
UNION ALL 
(SELECT * FROM AdventureWorks.sys.servers
EXCEPT
SELECT * FROM master.sys.servers)
-- (0 row(s) affected)

Yet, it is fully populated in Adventureworks.  I am puzzled.... Thanks.

Kalman Toth SQL 2008 GRAND SLAM
New Book: Pass SQL Exam 70-461 & Job Interview: Programming SQL Server 2012