Its possible to override an attribute from parent element?

Hi, there:
I have two elements with corresponding complex types, student and grad_student. grad_student extends student which has an required attribute called "salary". Now if I I want to make "salary" attribute "optional" in for grad_student, how can I do that?
<xsd:complexType name="student">
      <xsd:complexContent>
         <xsd:extension base="xyz:person">
            <xsd:attribute name="sid" type="xsd:ID" use="required"/>
            <xsd:attribute name="salary" type="xsd:string" use="required"/>
         </xsd:extension>
      </xsd:complexContent>
   </xsd:complexType>
   <xsd:element name="student" type="xyz:student"/>
   <xsd:complexType name="grad_student">
      <xsd:complexContent>
         <xsd:extension base="xyz:student">
            <xsd:attribute name="s_name" type="xsd:string" use="optional"/>
         </xsd:extension>
      </xsd:complexContent>
   </xsd:complexType>
   <xsd:element name="grad_student" type="xyz:grad_student"/>The following fails since salary is inherited and cannot be declared in the
child element again:
<xsd:complexType name="student">
      <xsd:complexContent>
         <xsd:extension base="xyz:person">
            <xsd:attribute name="sid" type="xsd:ID" use="required"/>
            <xsd:attribute name="salary" type="xsd:string" use="required"/>
         </xsd:extension>
      </xsd:complexContent>
   </xsd:complexType>
   <xsd:element name="student" type="xyz:student"/>
   <xsd:complexType name="grad_student">
      <xsd:complexContent>
         <xsd:extension base="xyz:student">
            <xsd:attribute name="s_name" type="xsd:string" use="optional"/>
           <xsd:attribute name="salary" type="xsd:string" use="optional"/>
         </xsd:extension>
      </xsd:complexContent>
   </xsd:complexType>
   <xsd:element name="grad_student" type="xyz:grad_student"/>regards,
Message was edited by:
jack_wns

Hi Jack,
Did you find a solution for this problem? We have come across the same issue and have not found an answer yet.
Thanks,
Denis

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Helllo everyone, I'm cross posting this here because I origanally asked in the from forum. My apologies...
I'm attempting to override a JAXB annotation. Internally, we use the field. Externally, we do not want the field to appear as it is an Internal only identifier. I have a class and a subclass. MemberPK is the internal version we use on our internal webservices, and ExternalMemberPK is the one we want to serialize externally.
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