Extending anyType

Hello,

I was wondering if extending anyType is allowed.  Is
the following schema code valid:

<element name="root">
  <complexType>
    <complexContent>
       <extension base="anyType">
	   <attribute name="att1" type="string"/>		      
</extension>
    </complexContent>
   </complexType>
</element>

Thanks,
 Rostam.

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