Your TAC is not valid
From WMO-No49_Vol-II_2018-upd-2021_Met-Service_fr.pdf page 146, polygon should be start by WI
Making a pull request
In making a pull request, please make sure that both the model under wmo-im/iwxxm-modelling and wmo-im/iwxxm are sychnchronized, and correct version of model's exported XMI file and HTML documentation are in wmo-im/iwxxm.
Your TAC is not valid From WMO-No49_Vol-II_2018-upd-2021_Met-Service_fr.pdf page 146, polygon should be start by WI
Making a pull request
In making a pull request, please make sure that both the model under wmo-im/iwxxm-modelling and wmo-im/iwxxm are sychnchronized, and correct version of model's exported XMI file and HTML documentation are in wmo-im/iwxxm.