Adding XSD 1.1 assertions to a complex type

I am using the XSD 1.1 and trying to add assertions to the complex types.
 I have an abstract complex type and another concrete complex type extending
the abstract complex type.
 For example:
 <xs:complexType name="abstract-comp-type" abstract="true">
 		<xs:sequence>
 			<xs:element type="xs:string" name="description" minOccurs="1"
maxOccurs="1" />
 			<xs:element name="comp-id" type="xs:ID" minOccurs="1" />
 	</xs:complexType>
 	
 	<xs:complexType name="concrete-comp-type">
 		
 		<xs:complexContent>
			<xs:extension base="abstract-comp-type">
 				<xs:sequence>
 					<xs:element name="element1" type="xs:string" minOccurs="1"
fixed="test"/>
 				</xs:sequence>
 			</xs:extension>
 		</xs:complexContent>
 	</xs:complexType>
 If I have more than one complex types extending from abstract-comp-type,
how do I add validation to check if all the sub types have an element named
element1?
 The reason why I need to add element1 in the sub type is to provide a fixed
value. I cannot use restriction because the sub type will have more elements
than the abstract type.


I created a JIRA ticket for this issue and the resolution given for that is
to open a question in the forum.



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