XSD assertion with xsi types

Another question on XSD 1.1 and assertions in the complex types. 
Use case: An abstract  complext type having another abstract complex type
element

 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:element ref="sub-abstract-type">
  </xs:complexType>
  
  <xs:element name="sub-abstract" type="sub-abstractType" />
  <xs:complexType name="sub-abstractType" abstract=true/>
  
 I have more than one complex types extending from abstract-comp-type and
individual complex types extending sub-abstractType

 <xs:complexType name="concrete-TypeA">
    <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>

  
<xs:complexType name="concrete-sub-TypeA">
  
  <xs:complexContent>
     <xs:extension base="sub-abstractType">
  </xs:extension>
  </xs:complexContent>
  </xs:complexType>
  
  
  
  <xs:complexType name="concrete-TypeB">
    <xs:complexContent>
     <xs:extension base="abstract-comp-type">
  <xs:sequence>
  <xs:element name="elemen2" type="xs:string" minOccurs="1" fixed="test"/>
  </xs:sequence>
  </xs:extension>
  </xs:complexContent>
  </xs:complexType>

  
<xs:complexType name="concrete-sub-TypeB">
  
  <xs:complexContent>
     <xs:extension base="sub-abstractType">
  </xs:extension>
  </xs:complexContent>
  </xs:complexType>

 I need to add validation , so that if the instance is of type
Concreate-TypeA, it should have concrete-sub-TypeA, and same with
Concrete-typeB and concrete-sub-TypeB
 
 I tried with the following assert element....But its not working. Can you 
help with the right syntax?
 <xs:assert test="(@xsi:type='Concreate-TypeA' and
root/sub-abstract/@xsi:type='concrete-sub-TypeA') or
 (@xsi:type='Concreate-TypeB' and
root/sub-abstract/@xsi:type='concrete-sub-TypeBA')"/>



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