help on composite-id tag

Hi,
Could you have the sample code to generate this
mapping:
<class name="StudentDiscipline"
      table="Student_Discipline" lazy="true">
  	<composite-id name="id"  
           class="StudentDiscipline$Id"
           unsaved-value="any">
           <key-property name="studentId"
                 access="field"
                 column="Student_id"
                 length="16"/>
  
          <key-property name="disciplineId"
                 access="field"
                 column="Discipline_Id"
                 length="16"/>
  	</composite-id>
 
Thanks for your help
HungVu


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