test.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" targetNamespace="http://cdcs.ed.ac.uk/postcard" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:postcard="http://cdcs.ed.ac.uk/postcard">
  <xs:import namespace="http://www.w3.org/2001/XMLSchema-instance" schemaLocation="xsi.xsd"/>
  <xs:element name="root">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="postcard:postcard"/>
      </xs:sequence>
      <xs:attribute ref="xsi:schemaLocation" use="required"/>
    </xs:complexType>
  </xs:element>
  <xs:element name="postcard">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="postcard:content"/>
        <xs:element ref="postcard:address"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:element name="content" type="xs:string"/>
  <xs:element name="address">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="postcard:name"/>
        <xs:element ref="postcard:co"/>
        <xs:element ref="postcard:street"/>
        <xs:element ref="postcard:town"/>
        <xs:element ref="postcard:county"/>
        <xs:element ref="postcard:postcode"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:element name="name" type="xs:string"/>
  <xs:element name="co" type="xs:string"/>
  <xs:element name="street" type="xs:string"/>
  <xs:element name="town" type="xs:string"/>
  <xs:element name="county" type="xs:NCName"/>
  <xs:element name="postcode" type="xs:string"/>
</xs:schema>