msgrel
msgrel — A related component of a message in a message set
Description
Every Msg has one primary message (MsgMain). It may also have any number of related messages, stored in MsgRel elements within the same Msg.
Related messages are usually messages that appear elsewhere in response to the same event (or set of events) that triggered the main message. For example, if a network client produces a failure or warning message, a related message might appear on the server console.
Processing expectations
May be formatted inline or as a displayed block, depending on context. Sometimes suppressed.
On the whole, the semantics of MsgSet are not clearly defined.