title: Why use pagination tokens?
body: <p>I am implementing pagination on a webservice. My first thought was to use query params <code>page</code> and <code>size</code>, like Spring Data.</p>
  
  <p>However, we are basing some of our design on the google webservice apis. I notice that they use pagination tokens, with each page result containing a <code>nextPageToken</code>. What are the advantages to using this approach? Changing data? What kind of info would be encoded in such a token?</p>