Perfect.  Thanks. 

> -----Original Message-----
> From: George Cristian Bina [mailto:george@o...] 
> Sent: Monday, March 05, 2007 9:52 AM
> To: Karr, David
> Cc: xml-dev@l...
> Subject: Re: [xml-dev] Does IDREF require a matching ID?
> 
> Hi,
> 
> If you have an IDREF attribute in the schema it is not 
> required for that schema to define an ID attribute. However, 
> when you validate an instance document the value for the 
> IDREF attribute needs to be specified in a component (element 
> or attribute) that have an ID type or a type derived form ID. 
> The part of the specification related with this is 
> http://www.w3.org/TR/xmlschema-1/#cvc-id
> ***
> 1 There must be no ID/IDREF binding in the item's [ID/IDREF 
> table] whose [binding] is the empty set.
> ***
> 
> Best Regards,
> George
> ---------------------------------------------------------------------
> George Cristian Bina
> <oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger 
> www.---.com
> 
> Karr, David wrote:
> > This may be a trivial question in this audience, but if you have an 
> > attribute defined in the schema as "xs:IDREF", does there 
> also have to 
> > be at least one attribute defined in the schema as "xs:ID", and a 
> > similar relationship in the XML instance document, with the IDREF 
> > value matching at least one ID attribute?  If this 
> relationship does 
> > not hold true, does this mean that the document is not valid?
> > 
> > If so, can you point me somewhere in the specs that state this?
> > 
> > 
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