title: External Data In iOS app
body: <p>We will be using a JSON feed for an iOS app. I have a few questions in how to design for an external data source.</p>
  
  <ol>
  <li><p>Should the external data source be cached in core data for a set period of time and then refetched when cache expires?</p></li>
  <li><p>What is a general strategy with dealing with external data sources? (In terms of caching/performance)</p></li>
  </ol>