title: NHibernate - create a complex index from hbm file
body: <p>I am creating my tables and indexes from the NHibernate mappings. </p>
  
  <p>For example, I create the LastName index as follows:</p>
  
  <pre><code>  &lt;property name="LastName" column="LastName" type="String" length="50"  not-null="true" index="IDX_Patient_Lastname"/&gt;
  </code></pre>
  
  <p>I would like to create a complex index, so that for example LastName and FirstName are generated as one index. Is this possible in NHibernate?</p>