The European Accessibility Act #EAA comes into force in June 2025 and accessibility metadata is a key part of this. You can use #ONIX 3 for communicating information about the accessibility of your digital publications in the supply chain. EDItEUR has published advice on using #ONIX for #a11y metadata
EDItEUR has published a draft ‘advanced’ application note on #accessibility #metadata in #ONIX at https://lnkd.in/eN5MsgFD. The 'essentials' version is available at https://lnkd.in/eQKyEUzn