xml validation error

hi, 

while creating the below part of the xsd, I'm getting errors: 

<xs:element name="HealthState"> 
<xs:complexType> 
<xs:simpleContent> 
<xs:restriction base="cim:cimUnsignedShort"> 
<xs:simpleType> 
<xs:union> 
<xs:simpleType> 
<xs:restriction base="xs:unsignedShort"> 
<xs:enumeration value="0"/> 
<xs:enumeration value="5"/> 
<xs:enumeration value="10"/> 
<xs:enumeration value="15"/> 
<xs:enumeration value="20"/> 
<xs:enumeration value="25"/> 
<xs:enumeration value="30"/> 
</xs:restriction> 
</xs:simpleType> 
<xs:simpleType> 
<xs:restriction base="xs:unsignedShort"> 
<xs:minInclusive value="31"/> 
</xs:restriction> 
</xs:simpleType> 
</xs:union> 
</xs:simpleType> 
</xs:restriction> 
</xs:simpleContent> 
</xs:complexType> 
</xs:element> 

where, the definition for cim:cimUnsignedShort is as follows in another
xsd.: 

<xs:complexType name="cimUnsignedShort"> 
<xs:simpleContent> 
<xs:extension base="xs:unsignedShort"> 
<xs:anyAttribute namespace="##any" processContents="lax"/> 
</xs:extension> 
</xs:simpleContent> 
</xs:complexType> 

Im getting the following error while validating: 

Type '{anonymous}' is not a valid restriction of type
'cim:cimUnsignedShort'. 
Error location: xs:schema / xs:element / xs:complexType / xs:simpleContent /
xs:restriction / @base 
derivation-ok-restriction.5.2: The simple type definition '{anonymous}' is
not a valid restriction of the base type definition's content type
'xs:unsignedShort'. 

Please help me understand the problem. 

thanks in advance. 

Nandan.
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