Someone

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0">
  <class name="Yops.Base.Roles, Yops.Base" table="Yops_Roles">
    <id name="RoleID" column="RoleID" unsaved-value="0" type="Int32">
      <generator class="identity"/>
    </id>
    <property name="Rolename" column="Rolename" type="String" length="40"/>
    <set name="Users" inverse="false" lazy="true" cascade="none" table="UserRoles">
      <key column="RoleID"/>
      <many-to-many class="Yops.Base.Users, Yops.Base" column="UserID"/>
    </set>
  </class>
</hibernate-mapping>