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extend two elements?


I have an element called "grad_student" which extends "student". Now I want to extend "grad_address" element too since "grad_student" element needs address related info. Unfortunately I cannot merge address info from "grad_address" element into "grad_student" element. I am wondering how I can
extend another element when this element already extends a base element?


    <xsd:complexType name="grad_student">
<xsd:extension base="student">
<xsd:attribute name="name" type="xsd:string" use="required"/>
<xsd:attribute name="grade" type="xsd:string" use="required"/>
<xsd:element name="grad_student" type="xyz:grad_student"/>

<xsd:complexType name="grad_address">
<xsd:extension base="address">
<xsd:attribute name="state" type="xsd:string" use="required"/>
<xsd:attribute name="zip_code" type="xsd:string" use="required"/>
<xsd:element name="grad_address" type="xyz:grad_address"/>

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