Use-case for a complex type that has no valid content?

["Costello, Roger L." <costello@mitre.org>]

Hi Folks,

 

Thanks for the outstanding responses.

 

I have learned that an empty choice:

 

    <xs:complexType name="ValidationKiller">
        <xs:choice/>
    </xs:complexType>

 

has no valid content, i.e., the set of valid content is the empty set, {}.

 

When would one use such a complex type? Can you think of a use-case for it?

 

/Roger