title: What is the standard format for a browser's User-Agent string?
body: <p>Is there an RFC, official standard, or template for creating a User Agent string? The iphone's user-agent string seems strange...</p>
  
  <blockquote>
    <blockquote>
      <p>Mozilla/5.0 (iPhone; U; <strong>CPU iPhone OS 3_1_2 like Mac OS X</strong>; en-us) AppleWebKit/528.18 (<strong>KHTML, like Gecko</strong>) Version/4.0 Mobile/7D11 Safari/528.16</p>
    </blockquote>
  </blockquote>