The xs:QName Type

SQL Server does not support types derived from xs:QName by the use of an XML Schema restriction element. Also, SQL Server currently does not support union types with QName as a member type.

Example

The following CREATE XML SCHEMA COLLECTION statements cannot load the XML schema, because they specify the xs:QName type as a member type of the union:

CREATE XML SCHEMA COLLECTION QNameLimitation1 AS N'  
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">  
    <xs:simpleType name="myUnion">  
        <xs:union memberTypes="xs:int xs:QName"/>  
    </xs:simpleType>  
</xs:schema>'  
GO  

CREATE XML SCHEMA COLLECTION QNameLimitation2 AS N'  
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">  
    <xs:simpleType name="myUnion">  
        <xs:union memberTypes="xs:integer">  
   <xs:simpleType>  
    <xs:list itemType="xs:QName"/>  
   </xs:simpleType>  
  </xs:union>  
    </xs:simpleType>  
</xs:schema>'  
GO  

Both statements fail with an error.

See Also

Requirements and Limitations for XML Schema Collections on the Server