RFC 9554 includes extensions to the ADR and N properties; adds new properties, such as LANGUAGE and SOCIALPROFILE; and adds new parameters, such as CREATED.
[a] Refer to Section 4.1 of RFC 2026 for an explanation of what "Proposed Standard" means in this context.
This is just a heads-up: RFC 9554, vCard Format Extensions for JSContact is a standards-track RFC, currently at "Proposed Standard" stage[a], which updates RFC 6350, the RFC that defines vCard 4.0.
RFC 9554 includes extensions to the ADR and N properties; adds new properties, such as LANGUAGE and SOCIALPROFILE; and adds new parameters, such as CREATED.
[a] Refer to Section 4.1 of RFC 2026 for an explanation of what "Proposed Standard" means in this context.