@openstreetmap/id-tagging-schema/data/fields/country_flag.json

The OpenStreetMap tagging model used by the iD editor

{
    "key": "country",
    "type": "combo",
    "label": "Flag Country",
    "prerequisiteTag": {
        "key": "flag:type",
        "value": "national"
    },
    "snake_case": false,
    "caseSensitive": true
}