vCard Contacts database

 https://stackoverflow.com/questions/9459742/seeking-schema-for-vcard-data-elements

 https://en.wikipedia.org/wiki/VCard

https://datatracker.ietf.org/doc/html/rfc6350 

https://www.w3.org/2002/12/cal/vcard-notes.html

https://github.com/alejandrolopezparra/AndroidContactsDatabase-tools/blob/master/acdb2vcf.py

vCard Contacts  DB schema  VCard 3.0 database  The Variant Call Format (VCF) Version 4.2 Specification

https://devguide.calconnect.org/vCard/vcard-4/

Cisco Jabber PST vCard WAB MSG Outlook  Google Contacts CSV LDIF  

archive abbu LDAP Data Interchange Format ldif 

 Digital business card

email format Contact 

kvCORE Customer Relationship Manager  Kunversion

business cards database  BCR  Android