<div class="content"><p>The IAppHostCollectionSchema provides methods that describe
the schema and constraints that apply to a specific <a href="5b32b6df-8364-4ba9-8d04-bfe0a4891a57" data-linktype="relative-path">IAppHostElementCollection</a>
from which this object was retrieved.</p><p>The IAppHostCollectionSchema <a href="4e36e522-a35d-4fec-bc9c-6ed14d49d5ca#gt_95913fbd-3262-47ae-b5eb-18e6806824b9" data-linktype="relative-path">interface</a> inherits opnums
0–2 from the <a href="../ms-dcom/2b4db106-fb79-4a67-b45f-63654f19c54c" data-linktype="relative-path">IUnknown</a>
interface.</p><p>Methods in RPC Opnum Order</p><table><thead>
  <tr>
   <th>
   <p>Method</p>
   </th>
   <th>
   <p>Description</p>
   </th>
  </tr>
 </thead><tbody><tr>
  <td>
  <p><a href="c6b8181e-b65c-4b11-983e-48066af98e6b" data-linktype="relative-path">AddElementNames</a></p>
  </td>
  <td>
  <p>Opnum: 3</p>
  </td>
 </tr><tr>
  <td>
  <p><a href="2939c8a6-f1c5-464e-a639-e1f915a84ca3" data-linktype="relative-path">GetAddElementSchema</a></p>
  </td>
  <td>
  <p>Opnum: 4</p>
  </td>
 </tr><tr>
  <td>
  <p><a href="a5872b86-4a8a-43af-82be-29c32e1fa7e6" data-linktype="relative-path">RemoveElementSchema</a></p>
  </td>
  <td>
  <p>Opnum: 5</p>
  </td>
 </tr><tr>
  <td>
  <p><a href="bab3821e-d86f-4f30-a649-2b525035ceb8" data-linktype="relative-path">ClearElementSchema</a></p>
  </td>
  <td>
  <p>Opnum: 6</p>
  </td>
 </tr><tr>
  <td>
  <p><a href="3113c6b2-f824-488e-9f15-b0cc61be9bd5" data-linktype="relative-path">IsMergeAppend</a></p>
  </td>
  <td>
  <p>Opnum: 7</p>
  </td>
 </tr><tr>
  <td>
  <p><a href="03d2b192-c6a3-4500-856a-e81d626d1624" data-linktype="relative-path">GetMetadata</a></p>
  </td>
  <td>
  <p>Opnum: 8</p>
  </td>
 </tr><tr>
  <td>
  <p><a href="ca6982ac-f047-4d95-9804-3cb7a9fb1249" data-linktype="relative-path">DoesAllowDuplicates</a></p>
  </td>
  <td>
  <p>Opnum: 9</p>
  </td>
 </tr></tbody></table><p> </p></div>