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Mixed Type and Simple Content

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SQL Server does not support restricting a mixed type to a simple content.

Example

In the following XML schema collection, myComplexTypeA is a complex type that can be emptied. That is, both its elements have minOccurs set to 0. The attempt to restrict this to a simple content, as in the myComplexTypeB declaration, is not supported. Therefore, the following XML schema collection creation fails:

CREATE XML SCHEMA COLLECTION SC AS '  
<schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://ns" xmlns:ns="http://ns"  
xmlns:ns1="http://ns1">  
  
    <complexType name="myComplexTypeA" mixed="true">  
        <sequence>  
            <element name="a" type="string" minOccurs="0"/>  
            <element name="b" type="string" minOccurs="0" maxOccurs="23"/>  
        </sequence>  
    </complexType>  
  
    <complexType name="myComplexTypeB">  
        <simpleContent>  
            <restriction base="ns:myComplexTypeA">  
                <simpleType>  
                    <restriction base="int">  
                        <minExclusive value="25"/>  
                    </restriction>  
                </simpleType>  
            </restriction>  
        </simpleContent>  
    </complexType>  
</schema>  
'  
GO

See Also

Requirements and Limitations for XML Schema Collections on the Server