XML XSD Problem

Hello,

is there a possibility to reference to a specified type dependent on the value of an element attribute.

For example:

HTML Code:

---

<xs:complexType name="MConfiguration">
    <!-- MConfiguration definition -->
</xs:complexType>

  <xs:element constraint="//CONFIGURATION[@id=MC]" name="CONFIGURATION" type="MConfiguration">
    <xs:complexType>
      <xs:sequence minOccurs="1" maxOccurs="unbounded">
        <xs:element ref="PARAMETER"/>
      </xs:sequence>
      <xs:attributeGroup ref="ConfigAttribGroup"/>
    </xs:complexType>
  </xs:element>

---

In this example I want to address to the type of the CONFIGURATION-Tag only if the value of the attribute id is MC....

Thanks