http://www.oasis-open.org/committees/ebxml-msg/schema/msg-header-2_0.xsd Acknowledgment AckRequested Action @(bodyExtension.grp) ConversationId CPAId Description DuplicateElimination Error ErrorList From From/Role @(headerExtension.grp) @id Manifest MessageData MessageHeader MessageId MessageOrder messageStatus.type non-empty-string PartyId Reference RefToMessageId Schema SequenceNumber sequenceNumber.type Service severity.type status.type StatusRequest StatusResponse SyncReply Timestamp TimeToLive To To/Role @version