From b0b35d4ebe98e1321c5f9003404fa4bdda255b18 Mon Sep 17 00:00:00 2001
From: Simon McVittie
Indicates that this field is read-only in the contact's
+ own vCard: it might be synthesized by either the server
+ or the connection manager. For instance, the Google Talk XMPP
+ server includes each contact's Google Plus URL in their vCard
+ as a read-only URL
field.
User interfaces SHOULD present this field as uneditable, or + hide it entirely.
+ +If a client attempts to edit a read-only field, the result + is undefined. It may appear to succeed (but actually be ignored), + or cause an error.
+