title: is openid.claimed_id static?
body: <p>I'm reading about <a href="http://code.google.com/apis/accounts/docs/OpenID.html#endpoint" rel="nofollow noreferrer"> Federated Login for Google Account Users</a> to figure out how I can have a user log in to a web application using their Google Account.</p>
  
  <p>So towards the end of the process, Google returns a Google supplied identifier which is appended as <code>openid.claimed_id</code>. This means the web application uses this identifier to recognize the user and allow access to application features and data. My question is, is this identifier static? Can I use this identifier to repeatedly id the same user?</p>