XU sounds like a good plan to me - if that works with the database. We could even make it XU-UNESCO.

2012/11/19 Platonides <platonides@gmail.com>
On 19/11/12 15:53, Lodewijk wrote:
> Oh, and one more question I couldn't solve: what ISO code should I use
> to identify as country in the link to the database? I have to fill one
> in on the toolserver link
> on http://en.wikipedia.org/wiki/Template:UNESCO_World_Heritage_Site_row .
>
> Lodewijk

We could use UN (an un-assigned code in ISO_3166), although if we want
to play safer, we can use XU (user-assigned).

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