title: NHibernate 3.3: composite-id with a key-property generated?
body: <p>I have read that this mapping is not possible in NHibernate 3.3:</p>
  
  <pre><code>&lt;class name="Digital" table="DIGITALS"&gt;
      &lt;composite-id&gt;
        &lt;key-many-to-one name="Person" class="Person" column="PERSONID" /&gt;
        &lt;key-property name="Id" column="ID"&gt;
          **&lt;generator class="increment"/&gt;**
        &lt;key-property/&gt;
      &lt;/composite-id&gt;
      &lt;property name="Nombre" column="NOMBRE" /&gt;
  </code></pre>
  
  <p>Basically I need a composite-id's property to be calculated automatically by NH.</p>
  
  <p>Maybe exists a technique to get something similar?</p>
  
  <p>Thanks in advance.</p>