how to generate multi column in <propery> tag

Hi,
  How do I need to do in XDoclet to create the
following mapping: 
<property   name="propertyName" type="MyUserType"
   <column name="column1" not-null="true" length="2"/>
   <column name="column2" not-null="true"/>
</property>

   My XDoclet is
/**
 * @hibernate.property name="propertyName"  
type="MyUserType"  
 * column="column1" not-null="true" length="2"
 * column="column2" not-null="true" 
 */  

 But the result I received was:
<property   name="propertyName" type="MyUserType"
   <column name="column2" not-null="true"/>
</property>

Any help is very appreciated,
HungVu

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