Thanks yet again to Pierre Joris for this notice from signandsight :

Die Welt 20.07.2010
The city of Weimar is seeking to twin itself with the Iranian city of Shiraz, the home town of Goethe's idol the Sufi poet Hafiz - on the condition that the Iranian side recognises the Holocaust. The Iranian delegation has since been to Weimar but refused outright to visit Buchenwald. Weimar, however, is reluctant to sever ties with its new friends, as Matthias Küntzel reports. "At the beginning of the week Fritz von Klinggräff, the Weimar press officer, confirmed the change of course. They had abandoned the bit about Buchenwald being an essential component of the friendship from the outset, in favour of the metaphor of 'the long road'. What was needed was an extended period of travelling in one another's company in order to 'see, as in an intellectual exchange, how compatibility can be created'." (In other words: one lot is saying there was a Holocaust, the other lot says there was no Holocaust and the truth lies somewhere in between!)