From d0f3a49b08cdc95c11ccb5f5dd530bbf1dceb11d Mon Sep 17 00:00:00 2001
From: Steve Kille
- A MIX channel MAY support message retraction, where the sender of a messages or an authorized administrator deletes a message. If this is done the original message MAY be replaced by a tombstone. The protocol to request retraction does this by adding to the message a <retract> element qualified by the 'urn:xmpp:mix:1' namespace. The <retract> element MUST include an <id> attribute that holds the id of the original message. A message and it's retraction shown in the following example. + A MIX channel MAY support message retraction, where the sender of a messages or an authorized administrator deletes a message. A MIX channel MAY limit the time frame in which a message is allowed to be retracted, for example to prevent retraction of very old messages. If this is done the original message MAY be replaced by a tombstone. The protocol to request retraction does this by adding to the message a <retract> element qualified by the 'urn:xmpp:mix:1' namespace. The <retract> element MUST include an <id> attribute that holds the id of the original message. A message and it's retraction shown in the following example.