Java 发现以元素'；开头的内容无效；说明'；。一个'；{quot；http://test.com/test/v1.0"；：description}'；预计

java代码：

   public static boolean validateXMLSchema(){
      try {
         SchemaFactory factory =
            SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
            Schema schema = factory.newSchema(new File("students.xsd"));
            Validator validator = schema.newValidator();
            validator.validate(new StreamSource(new File("students.xml")));
      } catch (IOException e){
         System.out.println("Exception: "+e.getMessage());
         return false;
      }catch(SAXException e1){
         System.out.println("SAX Exception: "+e1.getMessage());
         return false;
      }

students.xsd文件

<?xml version = "1.0"?>
<xs:schema elementFormDefault="qualified"
       xmlns:xs="http://www.w3.org/2001/XMLSchema"
       xmlns:midi="http://test.com/test/v1.0">

   <xs:import namespace="http://test.com/test/v1.0" schemaLocation="midi.xsd"/>

   <xs:element name = 'class'>
      <xs:complexType>
         <xs:sequence>
             <xs:element name = 'student' type = 'StudentType' minOccurs = '1' 
                maxOccurs = '1' />
         <xs:element name='rule' type='midi:rule' minOccurs = '1' 
                maxOccurs = '1' />
         </xs:sequence>
      </xs:complexType>
   </xs:element>

   <xs:complexType name = "StudentType">
      <xs:sequence>
         <xs:element name = "firstname" type = "xs:string"/>
         <xs:element name = "marks" type = "xs:positiveInteger"/>
      </xs:sequence>
      <xs:attribute name = 'rollno' type = 'xs:positiveInteger'/>
   </xs:complexType>             
</xs:schema>

midi.xsd

<?xml version="1.0" encoding="utf-8"?>
<xs:schema targetNamespace="http://test.com/test/v1.0"
    elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema"
    xmlns="http://test.com/test/v1.0">

     <xs:complexType name="rule">
          <xs:sequence>
            <xs:element name="description" type="xs:string" minOccurs="1" maxOccurs="1"/>
        </xs:sequence>
     </xs:complexType>
<!--    <xs:element name="rule" type="rule"/>-->

</xs:schema>

和我的xml文件

<?xml version = "1.0"?>
<class>  
   <student rollno = "593">    
      <firstname>Jasvir</firstname>
      <marks>90</marks>
   </student>
  <rule >
   <description>test</description>
  </rule>
</class>

贾斯维尔
90
测试

任何人都可以帮助我 当我执行java代码时，我得到了下面的错误 SAX异常：cvc复杂类型。2.4.a:发现以元素“description”开头的内容无效。应为“{”“：description}”之一。 对…无效