title: Understanding output of xattr -p com.apple.quarantine
body: <p>The other day I was messing with some files that had the extended attribute <em>com.apple.quarantine</em> on them. I am aware of its purpose, but I have always been curious what the properties below meant when you output its values.</p>
  
  <p>E.g. when I typed in </p>
  
  <p><code>xattr -p com.apple.quarantine xmlrpc.php</code> </p>
  
  <p>for a file that has the said xattr, I get output like this:</p>
  
  <p><code>0083;59b926ad;Safari.app;55847AA4-5562-42A2-89A7-8FAD394B455C</code></p>
  
  <p>What do the first 4 digits represent? i.e. <code>0083</code> Google hasn't brought up anything good and there are a few guides I found from users also trying to figure out what these numbers precisely represent.</p>