| http://www.w3.org/ns/prov#value | - The S/MIME approach defined in RFC 3923 has never been implemented in XMPP clients to the best of our knowledge, but has some attractive features, especially the ability to store-and-forward an encrypted message at a user's server if the user is not online when the message is received (in the XMPP community this is called offline storage and the message is referred to as an offline message).
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