org.hibernate.MappingException: <mapping> element in configuration specifies no known attributes

When i run the code it gives me an exception:

org.hibernate.MappingException: element in configuration specifies no known attributes

I am not sure where error occurs, can anyone help me to solve this..

hibernate.cfg.xml

     <hibernate-configuration>
     <session-factory>
     <property name="hbm2ddl.auto">create</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">"url"</property>
<property name="hibernate.connection.username">"username"</property>
<property name="hibernate.connection.password">"password"</property>
<mapping resource="student.hbm.xml"/>
<mapping/>

Student.java

public class Student {

private String name;
 private int id;

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

}

Regular.java

 public class Regular extends Student {

String coursefees;

public String getCoursefees() {
    return coursefees;
}

public void setCoursefees(String coursefees) {
    this.coursefees = coursefees;
}

}

Distant.java

 public class Distant extends Student {

String distantfees;

public String getDistantfees() {
    return distantfees;
}

public void setDistantfees(String distantfees) {
    this.distantfees = distantfees;
}

}

student.hbm.xml

       <!DOCTYPE hibernate-mapping PUBLIC
      "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
       "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

       <hibernate-mapping>


       <class name="pojos.Student" table="student" discriminator-       value="student">  
       <id name="id" type="int">  
       <column name="id"/>
       <generator class="increment"></generator>  
       </id>  

       <discriminator column="type" type="string"></discriminator>  
       <property name="name" type="string">
       <column name="sname"/>
        </property>

     <subclass name="pojos.Regular" discriminator-value="regstud">  
     <property name="coursefees" type="string">
     <column name="coursefees"/>
     </property>  
    </subclass>   

   <subclass name="pojos.Distant" discriminator-value="distant">  
   <property name="distantfees" type="string">
  <column name="distfees"/>
  </property>  
  </subclass>

 </class>

 </hibernate-mapping>

Error:

Exception in thread "main" org.hibernate.MappingException: element in configuration specifies no known attributes at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:2286) at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:2227) at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2207) at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2160) at org.hibernate.cfg.Configuration.configure(Configuration.java:2075)