key/keyref question

[James Trickel]

I am trying to validate the following XML:

<?xml version="1.0" encoding="UTF-8"?>
<simple-configuration 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:noNamespaceSchemaLocation="list.xsd">
 <simple-list>
   <list name="First">
     <key>1234</key>
   </list>
   <list name="Second">
     <key>2345</key>
   </list>
 </simple-list>
 <simple-group-list>
   <group name="First-Group">
     <groupname>First</groupname>
     <groupname>Second</groupname>
   </group>
   <group name="Second-Group">
     <groupname>Second</groupname>
   </group>
 </simple-group-list>
</simple-configuration>

Against the following Schema:
<?xml version="1.0" encoding="UTF-8"?>
<!-- edited with XMLSPY v2004 rel. 3 U (http://www.xmlspy.com)-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"; 
elementFormDefault="qualified" attributeFormDefault="unqualified" 
version="$Revision: 1.1.2.3 $" >
 <xs:element name="simple-configuration">
   <xs:complexType>
     <xs:all>
       <xs:element name="simple-list">
         <xs:complexType>
           <xs:sequence maxOccurs="unbounded">
             <xs:element name="list">
               <xs:complexType>
                 <xs:sequence>
                   <xs:element name="key" type="xs:string" minOccurs="0">
                   </xs:element>
                 </xs:sequence>
                 <xs:attribute name="name" type="xs:string" 
use="required"/>
               </xs:complexType>
             </xs:element>
           </xs:sequence>
         </xs:complexType>
         <xs:key name="simple-list-name">
           <xs:selector xpath="list"/>
           <xs:field xpath="@name"/>
         </xs:key>
       </xs:element>
       <xs:element name="simple-group-list">
         <xs:complexType>
           <xs:sequence maxOccurs="unbounded">
             <xs:element name="group">
               <xs:complexType>
                 <xs:sequence maxOccurs="unbounded">
                   <xs:element name="groupname" type="xs:string">
                     <xs:keyref name="included-groupname" 
refer="simple-list-name">
                       <xs:selector xpath="group"/>
                       <xs:field xpath="groupname"/>
                     </xs:keyref>
                   </xs:element>
                 </xs:sequence>
                 <xs:attribute name="name" type="xs:string" 
use="required"/>
               </xs:complexType>
             </xs:element>
           </xs:sequence>
         </xs:complexType>
         <xs:key name="group-name">
           <xs:selector xpath="group"/>
           <xs:field xpath="@name"/>
         </xs:key>
       </xs:element>
     </xs:all>
   </xs:complexType>
 </xs:element>
</xs:schema>

As you can see the schema was created with XMLSpy and validates; but 
with Xerces-C++ version 2.5.0 SAX2Print sample, I get the following errors:

Error at file list.xml, line 14, char 32
 Message: The keyref 'included-groupname' refers to a key/unique that 
is out of scope.
</groupname>

Any Ideas?

Thanks in advance.
James
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