1<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="attr_group_simple" elementFormDefault="qualified">
2  <xs:include schemaLocation="address.xsd" />
3  <xs:group name="address2" ref="address1">
4    <xs:sequence>
5      <xs:element name="road" type="xs:string"/>
6    </xs:sequence>
7  </xs:group>
8  <xs:element name="Student">
9    <xs:complexType>
10      <xs:group ref="address2"/>
11    </xs:complexType>
12  </xs:element>
13</xs:schema>
14