wiswiki.wmo.int will be retired on the 1st June 2020

The content of the wiki will be available from old.wmo.int/wiswiki/wiswiki.wmo.int as a static web site with an identical look. However, the wiki will not be functional and users will not be able to login and change or upload new content.



Welcome to the TT-AvXML pages

The Task Team on Aviation XML is a sub-team of the (IPET-DD)) team managed by WMO's Commission for Basic Systems that includes experts from the Commission for Aeronautical Meteorology and ICAO. Its purpose is to create an XML representation of meteorological information that is compatible with both WMO and aviation systems.

Activities before May 2017 are recorded on the old TT-AvXML page.

The IWXXM Standard

These details are also available as page IWXXM
The status of releases of IWXXM is recorded under the pages on the Manual on Codes Volume I.3. The plans for future releases of IWXXM are also available on a separate page.

Tools to support implementation of IWXXM

WMO has been notified of organizations able to provide tools to suport use of IWXXM. This list is on a separate page.

IWXXM 1.1 (supports ICAO amendment 76)

The sixteenth World Meteorological Congress approved IWXXM version 1.1 (formerly known as AvXML), a WMO standard data representation to be included in the new Volume I.3 of WMO-No. 306, Manual on Codes. This version of IWXXM was introduced to support Amendment 76 to Annex 3.

The formal definitions of this standard are in https://wis.wmo.int/ManCodes3, https://schemas.wmo.int/iwxxm/1.1 and http://codes.wmo.int. Additional linformation is available from the wiki page: AvXML-1.

IWXXM 2.1 (supports ICAO amendment 77)

Initial documentation of IWXXM version 2.1 is provided on this wiki in draft form. IWXXM 2.1 is intended to address the requirements of Amendment 77 to ICAO Annex 3.

IWXXM 2.1 will be documented in the Manual on Codes volume I.3 (this is currently being edited), http://schemas.wmo.int/iwxxm/2.1 and http://codes.wmo.int. Additional guidance is available from IWXXM-2.


IWXXM 3 is under development. The first approved version will be IWXXM 3.0, but before that working drafts labelled as IWXXM 3.0 RCnwill be produced for consultation. Any version of IWXXM labelled as "RC" must not be used for operations.

Documentation for IWXXM 3.0 will be provided on the IWXXM 3.0 wiki page as it is developed.

Reporting issues and requesting help

If you think you have identified an issue with iwxxm that may need a change to the specification or code lists, please use the issue reporting procedure.

If you need help with interpreting the iwxxm specifications, the team may be able to assist. Please send an email to cbs-tt-avxml @ wmo.int.

Team information


Teleconference notes

ID T Name Size Last Modified Hits Other Sorts
3515 application/msword TT AvXML 2013T0207
Notes on AvXML 1.0RC2 telecon 7 Feb 2013
47.00 KB Mon 17 of Jul, 2017 204 Information
3187 application/vnd.openxmlformats-officedocument.wordprocessingml.document TT AvXML 2016T1215
Notes on TT-AvXML teleconference 15 December 2016
20.76 KB Mon 17 of Jul, 2017 192 Information
3510 application/vnd.openxmlformats-officedocument.wordprocessingml.document TT AvXML 2017T1 Notes
Notes of the telecon of TT-AvXML 4 May 2017 (TT-AvXML 2017T1)
21.19 KB Wed 10 of May, 2017 333 Information
3516 application/vnd.openxmlformats-officedocument.wordprocessingml.document TT AvXML 2017T1 Notes
Notes of TT-AvXML Telecon 4 May 2017
25.89 KB Mon 17 of Jul, 2017 185 Information
3520 application/vnd.openxmlformats-officedocument.wordprocessingml.document TT AvXML 2017T2 Notes
Notes on TT-AvXML telecon 6 June 2017
24.19 KB Mon 17 of Jul, 2017 191 Information
3559 application/vnd.openxmlformats-officedocument.wordprocessingml.document TT AvXML 2017T3 D02
Unofficial summary of key issues from ICAO METP/WG=
55.31 KB Mon 17 of Jul, 2017 303 Information
3569 application/vnd.openxmlformats-officedocument.wordprocessingml.document TT AvXML 2017T3 Notes
Notes of the TT-AvXML Telecon 19 July 2017 (TT-AvXML-2017T3)
21.23 KB Tue 25 of Jul, 2017 209 Information
3825 application/vnd.openxmlformats-officedocument.wordprocessingml.document TT AvXML 20180118T Notes
Notes on telecon 18 January 2018
19.46 KB Fri 19 of Jan, 2018 184 Information
3562 text/plain TT AvXML 3 Missing URIs
List of URIs referred to by the files in schemas.wmo.int for IWXXM 2.1 that are not defined on codes.wmo.int
1.34 KB Wed 19 of Jul, 2017 198 Information
330 Folder Working documents
Temporary documents used to support TT-AvXML teleconferences. Do not rely on links to these documents working.
0 B Wed 19 of Jul, 2017 Information


Page last modified on Monday 22 of July, 2019 14:28:22 CEST