That is invalid.
If you look into the schema for schemas you can see that notation 
derives from openAttrs with the following definition:

<xs:complexType name="openAttrs">
     <xs:annotation>
         <xs:documentation> This type is extended by almost all schema 
types to allow attributes from other
             namespaces to be added to user schemas.</xs:documentation>
     </xs:annotation>
     <xs:complexContent>
         <xs:restriction base="xs:anyType">
             <xs:anyAttribute namespace="##other" processContents="la=
x"/>
         </xs:restriction>
     </xs:complexContent>
</xs:complexType>

That allows any attributes from other namespace but not from the XML 
schema namespace http://www.w3.org/2001/XMLSchema, while your attribute 
   is exactly in that namespace.

Best Regards,
George
-- 
George Cristian Bina
<oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger
www.---.com

bharath wrote:
> Hi..
> 
> Can u please tell me whether the following  notation is valid or not=85=
 
> where there is an attribute =93a:b="c"=94 in the declaration.
> 
>  
> 
> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
> 
>        <xsd:notation a:b="c" name="jpeg" public="image/jpeg" 
> system="viewer.exe" xmlns:a="http://www.w3.org/2001/XMLSchema"/>
> 
> </xsd:schema>
> 
>  
> 
> Thanks and Regards,
> 
> Bharath.
> 
>  
> 
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From mike@s... Fri Dec 05 08:54:54 2008
Received: from maggie.w3.org ([193.51.208.68])
	by frin