Terms Of Reference

<<<Original draft from wmo-im/sc-imt/et-tt/tt-avdata.adoc>>>

1. Maintain and further develop the ICAO Meteorological Information Exchange Model (IWXXM) as required by ICAO
2. Maintain the alphanumeric code forms related to aviation in the Manual on Codes Vol. I.1 as required by ICAO

<<<Revised draft 1 on 26 Apr 2024>>>

1. Maintain and further develop the ICAO Meteorological Information Exchange Model (IWXXM) as required by ICAO
2. Review and update the IWXXM information model, schemas, supporting code lists, as well as associated documentations including WMO-No. 306 Vol. I.3, regarding
   1. deprecation of WMO Manuals including No. 49 Volume II and the freezing of WMO-No. 306 Vol. I.1 and No. 386, etc.
   2. the creation of IWXXM code lists to replace those code lists of other table driven formats being used
3. Review and propose enhancements to the WMO Codes Registry regarding the retrieval of snapshots of valid code lists at an indicated time
4. Maintain the alphanumeric code forms in the WMO-No. 306 Vol. I.1 and the GTS headers in WMO-No. 386 related to aviation as required by ICAO
5. Engage participation of aviation stakeholders in the development of IWXXM
6. Promulgate publication of new versions of IWXXM to aviation stakeholders

<<<Revised draft 2 on 13 Apr 2024>>>

1. Maintain and further develop the ICAO Meteorological Information Exchange Model (IWXXM) as required by ICAO in Manual on Codes (WMO-No. 306) Vol. I.3; Review and update the IWXXM information model, schemas and supporting code lists to align with recent changes to WMO publications and to ensure that all IWXXM codes are comprehensively described in one code list;
2. Maintain the alphanumeric code forms and WMO abbreviated headings as required by ICAO;
3. Engage participation of aviation stakeholders in the development of IWXXM;
4. Promulgate publication of new versions of IWXXM to aviation stakeholders.