Would a reasonable workaround be to create different types (purhaps all as 
restrictions of a super type) and make then members of a group?  Then in the 
XML file explicitly define the type of each element (basically use the type 
in lue of the attribute)?
I could be WAY off base here... still learning my self

"Jonathon J. Howey" <JonathonJHowey@d...> wrote in 
message news:8A934A75-85B9-4A19-AB90-70973AEC4506@m......
> Blah, I was afraid so, thanks.
>
> "Stan Kitsis [MSFT]" wrote:
>
>> You cannot do this using Xml Schema.
>>
>> -- 
>> Stan Kitsis
>> Program Manager, XML Technologies
>> Microsoft Corporation
>>
>> This posting is provided "AS IS" with no warranties, and confers no 
>> rights.
>>
>>
>> "Jonathon J. Howey" <JonathonJHowey@d...> wrote in
>> message news:9744A4B7-9A0B-446F-AFF7-7DEE282BC4EA@m......
>> > Am i able to create a restriction in my XSD for the following case:
>> >
>> > <tabs>
>> > <tab id="General" order="1" selected="true" />
>> > <tab id="Edit" order="2" selected="false" />
>> > <tab id="View" order="3" selected="false" />
>> > </tabs>
>> >
>> > So what I would like to do, is to say that only one tab can have
>> > selected="true".  A unique restriction won't work as it will cause
>> > problems
>> > for the false ones
>> >
>>
>>
>>