State parties in headnotes
Where the party is a country or state, capture the relevant ISO country code as the value of the ISOcountry attribute on the partyName element.
partyName/@ISOcountry
No partyName should have both ISOcountry and nationality attributes.
In IC, Party 2 should always be a country.
For example
<partyName ISOcountry="CO">Colombia</partyName>