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When the extremist group Isis declared a "Caliphate" in parts of Syria and Iraq they reignited a debate over the role of an Islamic State. The Ottoman Empire was the last widely recognised Caliphate and most of those in the Western world have only the faintest, if any, idea of what the word means. But for some Muslims, it's what they are waiting for - whether they back Isis or not. The Â鶹Éç's Asian Network reporter Catrin Nye reports. (Photo: A caliphate flag used by Muslims historically reads "There is no god but Allah; Muhammad is the Messenger of Allah")