The display identifier is related to the Claimed Identifier, but the
two are not always identical. The display identifier is something the
user should recognize as what they entered, whereas the response's
claimed identifier (in the identity_url attribute) may have extra
information for better persistence.
URLs will be stripped of their fragments for display. XRIs will
display the human-readable identifier (i-name) instead of the
persistent identifier (i-number).
Use the display identifier in your user interface. Use
identity_url for querying your database or authorization server.
