The Countries Section

The optional countries element contains one or more country elements.

<countries>
    <country>
        <iso>FR</iso>
        <name lang="fr">France</name>
        <name lang="en">France</name>
        <name lang="de">Frankreich</name>
    </country>
    <country>
        <iso>BE</iso>
        <name lang="fr">Belgique</name>
        <name lang="nl">België</name>
    </country>
</countries>

iso

The ISO 3166 Alpha-2 country code (https://www.iso.org/iso-3166-country-codes.html).