title: SharePoint SPClaimProvider details/usage
body: <p>I have to implement my own SPClaimProvider for PeoplePicker. There are some methods to override. Problem: I can't figure out some methods/parameters usage. All of these methods are claims specific. </p>
  
  <p>Examples: </p>
  
  <ul>
  <li>method FillClaimValueTypes. What is claim value type? What doest it mean?</li>
  <li>method FillSearch, parameters hierarchyNodeID, searchTree - what this all is about? How can I use this?</li>
  </ul>
  
  <p>Got ideas?</p>