<?xml version="1.0" encoding="UTF-8"?>
<!-- !DOCTYPE teaching SYSTEM "plan.dtd" -->
<teaching xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="plan.xsd">
 <course id="001">
  <course-name>大学英语</course-name>
  <class-hour>36</class-hour>
  <exam-form>考试</exam-form>
 </course>
 <course id="002">
  <course-name>高等数学</course-name>
  <class-hour>70</class-hour>
  <exam-form>考试</exam-form>
 </course>
 <course id="003">
  <course-name>计算机应用基础</course-name>
  <class-hour>108</class-hour>
  <exam-form>上机考试</exam-form>
 </course>
</teaching>

<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema">
 <element name="teacing">
  <complexType>
   <sequence>
    <element name="course" minOccurs="1" maxOccurs="9999">
     <complexType>
      <sequence>
       <element name="course-name" type="string"></element>
       <element name="class-hour">
        <restriction base="integer">
          <minInclusive value="0"></minInclusive>
          <maxInclusive value="100"></maxInclusive>
        </restriction>
       </element>
       <element name="exam-from" type="string"></element>
      </sequence>
     </complexType>
    </element>
   </sequence>
  </complexType>
 </element>
</schema>

错误1：cvc-elt.1: Cannot find the declaration of element
 'teaching'.

错误2：s4s-elt-must-match.1: The content of 'class-hour' must match (annotation?, (simpleType |
 complexType)?, (unique | key | keyref)*)). A problem was found starting at: restriction.