title: XXXX is no longer used. <see cref="EdmModelDiffer" /> is now used to detect changes in the model
body: <p>In EF 4.3 <code>IncludeMetadataConvention</code>, <code>EdmMetadata</code> and other classes are obsolete:</p>
  
  <blockquote>
    <p>The XXX is no longer used. EdmMetadata is not
    included in the model. &lt;see cref=&quot;EdmModelDiffer&quot; /&gt;
    is now used to detect changes in the model.</p>
  </blockquote>
  
  <p>What is <code>EdmModelDiffer</code> and how it should be used?</p>