Thanks Jeff:

Seems you are right.  I was convinced I had tried both variants to no avail 
but this time @my:clientId worked fine.

my:@clientId on the other hand produced the same error messages I had seen 
before informing me that this was "invalid in the context of the subset of 
xpath supported by xml schema" or "an invalid restricted xpath expression".  
I was obviously reading too much into these messages when they were in fact 
just polite forms of "What the.....?".

Cheers Jack

>From: Jeff Rafter <lists@j...>
>Reply-To: lists@j...
>To: Jack Lindsey <tuquenukem@h...>
>CC: mike@s...,  nwh@a...,  xmlschema-dev@w...
>Subject: Re: Use of key/keyref - any best practices? warnings?
>Date: Wed, 27 Jul 2005 19:37:28 -0700
>
>
>>But this is not:
>>
>>         <xs:key name="KeyClientById">
>>             <xs:selector xpath="my:Clients/my:Client"/>
>>             <xs:field xpath="my:@clientId"/>
>>         </xs:key>
>
>Haven't tested it, but shouldn't that be:
>
>           <xs:field xpath="@my:clientId"/>
>
>BTW, which validator were you using to test this? I would like to try it 
>when I run my tests (when I get a chance).
>
>Cheers,
>Jeff Rafter
>

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From vivekorama@g... Tue Mar 01 08:17:49 2005
Received: from wiggum.w3.or