Facebook ads - Products feed - Multiple shipping zones setting

I'm writing a feed from an e-shop, to give to facebook.

So far so good. The feed is in XML format, and the reference provides a sample, and the format for the shipping field in the item, within the feed, is:

<g:shipping><g:country>UK</g:country><g:service>Standard</g:service><g:price>4.95 GBP</g:price></g:shipping>

However, the reference states that the format should be a comma-separated string, like this:

Blob with different prices for each country and region. Different regions are comma-separated. The format should be COUNTRY:STATE:SHIPPING_TYPE:PRICE.e.g.US:CA:Ground:9.99 USD, US:NY:Air:15.99 USD

Do you catch the contradiction?

If I try in my feed:

<g:shipping>US:CA:Ground:9.99 USD, US:NY:Air:15.99 USD</g:shipping>

I get errors, that country or price is missing.

So, I will have to stick to the sample.

The question is:

Which is the right way to provide multiple shipping zones in the feed?

The debugging tool here is not helping at all...

Do I repeat the g:shipping fieldset?

<g:shipping><g:country>UK</g:country><g:service>Standard</g:service><g:price>4.95 GBP</g:price></g:shipping><g:shipping><g:country>US</g:country><g:service>Standard</g:service><g:price>5.30 GBP</g:price></g:shipping>

Do I iterate within the fieldset?

<g:shipping><g:country>UK</g:country><g:service>Standard</g:service><g:price>4.95 GBP</g:price><g:country>US</g:country><g:service>Standard</g:service><g:price>5.30 GBP</g:price></g:shipping>

Or what, if anything, do I have to do to have multiple zones, before switching to CSV (which I don't want to do, but I will if I have to: CSV supports the comma-separated format for multiple zones)?