0.4.0 The basic OM2 message ontology 1 1 A description (where,what and when) of an error that occured when a node handled a message. 1 1 The payload/body of the message Errors that nodes handling this message has encountered When this message reaches a endpoint that endpoint should send a message acknowledging the receivement to this address. In an error happend that prevented a node from furthering this message to an intended recipient it should instead be sent to this address/-es. Intended receivers of this message. Message identifier When this event occured The address of the node that encountered an error while processing a message. Recipients that get this message after this time should just silently ignore the message. The message id of the message that this message is a reply to The origin of this message The last time by which the sender is interested in a reply to the 'replyTo' address signifying the reception of a message. A human readable description of an error that prevented a node to do what it should with the a message The time something happend