# Council Decision (EU) 2018/1926 of 19 November 2018 on the position to be taken, on behalf of the European Union, in the Group of Experts on the European Agreement concerning the work of crews of vehicles engaged in international road transport of the United Nations Economic Commission for Europe, Division 2.4

Extent: E+W+S+N.I.

The XML messages shall include at least the minimum requirements laid down in Table 2.
Table 2
Minimum requirements for the content of the XML messages
Common Header
Mandatory
Version
The official version of the XML specifications will be specified through the namespace defined in the message XSD and in the version attribute of the Header element of any XML message. The version number (‘n.m’) will be defined as fixed value in every release of the XML Schema Definition file (xsd).
Yes
Test Identifier
Optional id for testing. The originator of the test will populate the id and all participants in the workflow will forward/return the same id. In production it should be ignored and will not be used if it is supplied.
No
Technical Identifier
A UUID uniquely identifying each individual message. The sender generates a UUID and populates this attribute. This data is not used in any business capacity.
Yes
Workflow Identifier
The workflow id is a UUID and should be generated by the requesting party. This id is then used in all messages to correlate the workflow.
Yes
Sent At
The date and time (UTC) that the message was sent.
Yes
Timeout
This is an optional date and time (in UTC format) attribute. This value will be set only by the central hub for forwarded requests. This will inform the responding party of the time when the request will be timed out. This value is not required in MS2TCN_<x>_Req and all response messages. It is optional so that the same header definition can be used for all message types regardless of whether or not the timeoutValue attribute is required.
No
From
The ISO 3166-1 Alpha 2 code of the party sending the message or ‘EU’.
Yes
To
The ISO 3166-1 Alpha 2 code of the party to which the message is being sent or ‘EU’.
Yes

---
Source: https://www.legislation.gov.uk/eudn/2018/1926/annex/ATTACHMENT/division/4/division/2/division/2.4 (the official version)
Page: https://openlegislation.uk/eu-decision-2018-1926/annex-ATTACHMENT/division-4/division-2/division-2.4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.