title: Standard way of referencing an object by identity (for, eg, circular references)?
body: <p>Is there a standard way of referencing objects by identity in JSON? For example, so that graphs and other data structures with lots of (possibly circular) references can be sanely serialized/loaded?</p>
  
  <p><strong>Edit</strong>: I know that it's easy to do one-off solutions (“make a list of all the nodes in the graph, then …”). I'm wondering if there is a standard, generic, solution to this problem.</p>