title: Objective-C "<...>" notation
body: <p>I'm reading through More iPhone Programming 3, and I cannot remember what the &lt;> notation is.  I know it's to conform to Protocols for a class, but I'm not sure what it is in this example talking about NSFetchedResultsController in the Core Data section.  Here is the code:</p>
  
  <pre><code>- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { 
  id &lt;NSFetchedResultsSectionInfo&gt; sectionInfo = [[fetchedResultsController sections] objectAtIndex:section];
  return [sectionInfo numberOfObjects];
  </code></pre>
  
  <p>Thanks!</p>