Recommend use of contact bare JIDs for item IDs
Because contact vCards are private information, they are best stored using &xep0223;. The canonical location is a well-known pubsub node "urn:xmpp:contacts". In accordance with XEP-0223, this node MUST have an access type of "whitelist" by default. When a client stores items at this node, it SHOULD NOT include an ItemID, so that the pubsub service can assign those identifiers.
+Because contact vCards are private information, they are best stored using &xep0223;. The canonical location is a well-known pubsub node "urn:xmpp:contacts". In accordance with XEP-0223, this node MUST have an access type of "whitelist" by default. When a client stores items at this node, it MUST include an ItemID set to the bare JID of the contact.