@henshaw You may also be interested in JSContact! https://datatracker.ietf.org/doc/draft-ietf-calext-jscontact/
@joe very interesting. Is this what y’all are using at Fastmail along with JMAP?
I found jCard because I was trying to figure out if vCard supported custom fields. That led me down the rabbit hole of vendors submitting custom fields to IETF.
I’m primarily trying to see if I can include tags and groups in vCards that could be imported by Apple’s Contacts app. So far, that answer appears to be, “no.”
And all of this is related my project here: https://coywolf.app
The federated instance of Mastodon for Coywolf