title: Which is the Iteration ID?
body: <p>For on-premise TFS 2015: </p>
  
  <p>When I use the Rest API to get iteration ids for a team the ids appear to be a GUID (e.g. "d682cb38-75f3-485d-a238-7da5f7a41b9e"). </p>
  
  <p>I need to find work items for that iteration, but when I use WIQL to query <code>[System.IterationsId]</code> it comes back as an integer (e.g. 9424). </p>
  
  <p>How would I find work items for an iteration?</p>