IIC Instrument related parties
Some treaties apply to parties other than the originals because the original party country has become a different country or set of countries. Capture these related parties inside subsequent country elements, with a relatedCountry element appearing after countryName.
country/countryName[following-sibling::relatedCountry]
Example
<country ISOcountry="CH">
<countryName>Switzerland</countryName>
<relatedCountry/>
</country>
<country ISOcountry="RU">
<countryName>Russian Federation</countryName>
<relatedCountry/>
</country>