一则XML Schema的例子

 

<?xml version="1.0" encoding="UTF-8"?>
<!-- 10 question quiz about Australian Geography -->
<quiz xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="quiz.xsd">
 <mchoice>
  <question>What is the capital city of Australia?</question>
  <answer>Sydney</answer>
  <answer correct="yes">Canberra</answer>
  <answer>Melbourne</answer>
  <answer>Gold Coast</answer>
 </mchoice>
 <mchoice>
  <question>Launceston is the second largest city in which Australian state?</question>
  <answer>Victoria</answer>
  <answer>New South Wales</answer>
  <answer correct="yes">Tasmania</answer>
  <answer>Western Australia</answer>
 </mchoice>
 <mchoice>
  <question>Which state has the famous 'Twelve Apostles' ?</question>
  <answer correct="yes">Victoria</answer>
  <answer>South Australia</answer>
  <answer>New South Wales</answer>
  <answer>Western Australia</answer>
 </mchoice>
 <mchoice>
  <question>Which is a popular ski resort in NSW?</question>
  <answer correct="yes">Perisher Blue</answer>
  <answer>Mt. Buller</answer>
  <answer>Mt. Baw-Baw</answer>
  <answer>Lake Mountain</answer>
 </mchoice>
 <mchoice>
  <question><![CDATA[Which of the following is <u>NOT</u> Australian native animals?]]></question>
  <answer>Kangaroo</answer>
  <answer correct="yes">Penguin</answer>
  <answer>Koala</answer>
  <answer>Wombat</answer>
 </mchoice>
 <mchoice>
  <question>Which city has an extensive tram network?</question>
  <answer>Sydney</answer>
  <answer correct="yes">Melbourne</answer>
  <answer>Adelaide</answer>
  <answer>Ballarat</answer>
 </mchoice>
 <mchoice>
  <question>What is known as 'The Silver City' in Australia?</question>
  <answer>Alice Springs</answer>
  <answer correct="yes">Broken Hill</answer>
  <answer>Ballarat</answer>
  <answer>Silverton</answer>
 </mchoice>
 <mchoice>
  <question>In which location the war movie 'Thin Red Line' was taken?</question>
  <answer>Anglesea</answer>
  <answer>Apollo Bay</answer>
  <answer>Margaret River</answer>
  <answer>Monkey Mia</answer>
  <answer correct="yes">Townsville</answer>
 </mchoice>
 <mchoice>
  <question><![CDATA[Which is <u>NOT</u> true about Uluru ?]]></question>
  <answer>It is the world biggest monolith located in the centre of Australian continent</answer>
  <answer>It was named 'Ayers Rock' by European explorer William Gosse in 1873</answer>
  <answer correct="yes">Aboriginal people encourage tourists to climb Uluru</answer>
  <answer>The area contains carvings and paintings by Aboriginal people</answer>
 </mchoice>
 <mchoice>
  <question>What is so special about Longreach?</question>
  <answer>The place where a blacksmith named Thomas Hiscock found the first gold that triggerred gold rush</answer>
  <answer>The town has an expansive, well-preserved penal colony of Australia's early history</answer>
  <answer correct="yes">The first commercial flight by Qantas took from this town in 1921</answer>
  <answer>None of these answers are correct</answer>
 </mchoice>
</quiz>

<?xml version="1.0" encoding="UTF-8" ?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
 <xs:element name="quiz">
  <xs:complexType>
   <xs:choice>
    <xs:element name="mchoice" maxOccurs="unbounded">
     <xs:complexType>
      <xs:sequence>
       <xs:element name="question" type="xs:string" />
       <xs:element name="answer" minOccurs="2" maxOccurs="unbounded">
        <xs:complexType>
         <xs:simpleContent>
          <xs:extension base="xs:string">
           <xs:attribute name="correct" use="optional">
            <xs:simpleType>
             <xs:restriction base="xs:string">
              <xs:enumeration value="yes" />
              <xs:enumeration value="no" />
             </xs:restriction>
            </xs:simpleType>
           </xs:attribute>
          </xs:extension>
         </xs:simpleContent>
        </xs:complexType>
       </xs:element>
      </xs:sequence>
     </xs:complexType>
    </xs:element>
   </xs:choice>
  </xs:complexType>
 </xs:element>
</xs:schema>