empty xs:extension of a simple type

I'm looking at a machine generate schema which contains this:

<xs:complexType name="foo">
  <xs:simpleContent>
    <xs:extension base="xs:string">
    </xs:extension>
  </xs:simpleContent>
</xs:complexType>

That's just the same as type="xs:string" isn't it?


thanks

-- 
Andrew Welch
http://andrewjwelch.com
Kernow: http://kernowforsaxon.sf.net/