For HL7 I have not done so because I don't actively work with it(apart from helping a colleague every now and then). For other formats provided by the (Belgian)

For HL7 I have not done so because I don't actively work with it(apart from helping a colleague every now and then). For other formats provided by the (Belgian) government I have. And even made some PRs to their services :) Which they did merge and overal they do seem open to improvements of their systems and standards.