title: Objective-C IF statement with OR condition
body: <p>What's wrong in this IF statement?</p>
  
  <pre><code>if ([currentElement isEqualToString:@"aaa" || currentElement isEqualToString:@"bbb"])
  </code></pre>
  
  <p>XCode says: </p>
  
  <pre><code>No visible @interface for 'NSString' declares the selector 'isEqualToString:isEqualToString:'
  </code></pre>
  
  <p>I'm into an NSXML Parser procedure if it can help, but I think it's not that the problem.</p>