title: How to override field value display in Django admin change form
body: <p>How can I override the value that is displayed for a field in the Django admin?  The field contains XML and when viewing it in the admin I want to pretty-format it for easy readability.  I know how to do reformatting on read and write of the field itself, but this is not what I want to do.  I want the XML stored with whitespace stripped and I only want to reformat it when it is viewed in the admin change form.</p>
  <p>How can I control the value displayed in the textarea of the admin change form for this field?</p>